Click here for production status of specific part numbers. MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E General Description The MAX3224E/MAX3225E/MAX3226E/MAX3227E/ MAX3244E/MAX3245E are 3V-powered EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup features, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to 15kV using IEC 1000-4-2 Air-Gap Discharge, 8kV using IEC 1000-4-2 Contact Discharge, and 15kV using the Human Body Model. All devices achieve a 1A supply current using Maxim's revolutionary AutoShutdown PlusTM feature. These devices automatically enter a low-power shutdown mode when the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive, and the UART driving the transmitter inputs is inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receiver input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system. The MAX3225E/MAX3227E/MAX3245E also feature MegaBaudTM operation, guaranteeing 1Mbps for high-speed applications such as communicating with ISDN modems. The MAX3224E/MAX3226E/MAX3244E guarantee 250kbps operation. The transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1F capacitors for operation from a 3.3V supply. The MAX3224E-MAX3227E feature a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting. All devices are available in a space-saving TQFN, SSOP, and TSSOP (MAX3224E/MAX3225E/MAX3244E/ MAX3245E) packages. Applications Notebook, Subnotebook, and Palmtop Computers Cellular Phones Battery-Powered Equipment Hand-Held Equipment Peripherals Printers Automotive AutoShutdown Plus, MegaBaud, and UCSP are trademarks of Maxim Integrated Products, Inc. 19-1339; Rev 11; 11/18 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Next Generation Device Features For Space-Constrained Applications: MAX3228E/MAX3229E: 15kV ESD-Protected, +2.5V to +5.5V, RS-232 Transceivers in UCSPTM MAX3222E/MAX3232E/MAX3241E/MAX3246E: 15kV ESD-Protected, Down to 10nA, +3.0V to +5.5V, Up to 1Mbps, True RS-232 Transceivers (MAX3246E Available in UCSP) For Low-Voltage or Data Cable Applications: MAX3380E/MAX3381E: +2.35V to +5.5V, 1A, 2Tx/2Rx RS-232 Transceivers with 15kV ESD-Protected I/O and Logic Pins Ordering Information PART TEMP RANGE PIN-PACKAGE MAX3224ECTP+ 0C to +70C 20 TQFN-EP* MAX3224ECUP+ 0C to +70C 20 TSSOP MAX3224ECAP+ 0C to +70C 20 SSOP MAX3224ECPP+ 0C to +70C 20 Plastic DIP MAX3224EETP+ -40C to +85C 20 TQFN-EP* MAX3224EEUP+ -40C to +85C 20 TSSOP MAX3224EEAP+ -40C to +85C 20 SSOP MAX3224EEPP+ -40C to +85C 20 Plastic DIP MAX3224EAAP+ -40C to +125C 20 SSOP +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Ordering Information continued at end of data sheet. Selector Guide PART NO. OF GUARANTEED AutoREADY DRIVERS/ DATA RATE Shutdown OUTPUT RECEIVERS (bps) Plus MAX3224E 2/2 250k u u MAX3225E MAX3226E 2/2 1M u u 1/1 250k u u MAX3227E 1/1 1M u u MAX3244E 3/5 250k -- u MAX3245E 3/5 1M -- u MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Absolute Maximum Ratings VCC to GND.............................................................-0.3V to +6V V+ to GND (Note 1)..................................................-0.3V to +7V V- to GND (Note 1)...................................................+0.3V to -7V V+ +V-(Note 1).................................................................+13V Input Voltages T_IN, FORCEON, FORCEOFF to GND...............-0.3V to +6V R_IN to GND....................................................................25V Output Voltages T_OUT to GND..............................................................13.2V R_OUT, INVALID, READY to GND....... -0.3V to (VCC + 0.3V) Short-Circuit Duration T_OUT to GND.......................................................Continuous Continuous Power Dissipation (TA = +70C) 16-Pin SSOP (derate 7.10mW/C above +70C)......571.4mW 16-Pin TSSOP (derate 9.4 mW/C above +70C).....754.7mW 16-Pin TQFN (derate 20.8mW/C above +70C)....1666.7mW 20-Pin TQFN (derate 21.3mW/C above +70C) ....1702.1mW 20-Pin Plastic DIP (derate 11.11mW/C above +70C) .............................889mW 20-Pin SSOP (derate 8.00mW/C above +70C).........640mW 20-Pin TSSOP (derate 11mW/C above +70C)......879.1 mW 28-Pin Wide SO (derate 12.5mW/C above +70C)...........1W 28-Pin SSOP (derate 9.1mW/C above +70C)........727.3mW 28-Pin TSSOP (derate 14mW/C above +70C).....1025.6mW 36-Pin TQFN (derate 26.3mW/C above +70C)...... 2105.3mW Operating Temperature Ranges MAX32_ _EC_ _..................................................0C to +70C MAX32_ _EE_ _.............................................. -40C to +85C MAX32_ _EAA_............................................. -40C to +125C Storage Temperature Range............................. -65C to +160C Lead Temperature (soldering, 10s).................................. +300C Soldering Temperature (reflow)........................................+260C Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information 16-SSOP PACKAGE CODE A16+2 Outline Number 21-0056 Land Pattern Number 90-0106 Thermal Resistance, Single layer board: Junction to Ambient (JA) 140 Junction to Case (JC) 34 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 86 Junction to Case (JC) 33 16-TSSOP PACKAGE CODE U16+1 Outline Number 21-0066 Land Pattern Number 90-0117 Thermal Resistance, Single layer board: Junction to Ambient (JA) 106 Junction to Case (JC) 27 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 90 Junction to Case (JC) 27 www.maximintegrated.com Maxim Integrated 2 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Package Information (continued) 16-TQFN-EP PACKAGE CODE T1655+2 Outline Number 21-0140 Land Pattern Number 90-0072 Thermal Resistance, Single layer board: Junction to Ambient (JA) 48 Junction to Case (JC) 2 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 30 Junction to Case (JC) 2 20-DIP PACKAGE CODE P20+3 Outline Number 21-0043 Thermal Resistance, Single layer board: Junction to Ambient (JA) 90 Junction to Case (JC) 30 20-SSOP PACKAGE CODE A20+1 Outline Number 21-0056 Land Pattern Number 90-0094 Thermal Resistance, Single layer board: Junction to Ambient (JA) 125 Junction to Case (JC) 32 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 84 Junction to Case (JC) 33 www.maximintegrated.com Maxim Integrated 3 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Package Information (continued) 20-TSSOP PACKAGE CODE U20+2 Outline Number 21-0066 Land Pattern Number 90-0116 Thermal Resistance, Single layer board: Junction to Ambient (JA) 91 Junction to Case (JC) 20 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 73.8 Junction to Case (JC) 20 20-TQFN-EP PACKAGE CODE T2055+5 Outline Number 21-0140 Land Pattern Number 90-0010 Thermal Resistance, Single layer board: Junction to Ambient (JA) 47 Junction to Case (JC) 2 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 29 Junction to Case (JC) 2 28-WIDE SO PACKAGE CODE W28+6 Outline Number 21-0042 Land Pattern Number 90-0109 Thermal Resistance, Single layer board: Junction to Ambient (JA) 80 Junction to Case (JC) 18 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 59 Junction to Case (JC) 18 www.maximintegrated.com Maxim Integrated 4 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Package Information (continued) 28-SSOP PACKAGE CODE A28+1 Outline Number 21-0056 Land Pattern Number 90-0095 Thermal Resistance, Single layer board: Junction to Ambient (JA) 110 Junction to Case (JC) 25 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 67.1 Junction to Case (JC) 25 28-TSSOP PACKAGE CODE U28+2 Outline Number 21-0066 Land Pattern Number 90-0171 Thermal Resistance, Single layer board: Junction to Ambient (JA) 78 Junction to Case (JC) 13 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 71.6 Junction to Case (JC) 13 36-TQFN PACKAGE CODE T3666+3 Outline Number 21-0141 Land Pattern Number 90-0050 Thermal Resistance, Single layer board: Junction to Ambient (JA) 38 Junction to Case (JC) 1 Thermal Resistance, Four-layer board: Junction to Ambient (JA) 28 Junction to Case (JC) 1 For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. www.maximintegrated.com Maxim Integrated 5 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Electrical Characteristics (VCC = +3V to +5.5V, C1-C4 = 0.1F, tested at 3.3V 10%; C1 = 0.047F, C2-C4 = 0.33F, tested at 5.0V 10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS (VCC = 3.3V or 5.0V, TA = +25C) Supply Current, AutoShutdown Plus FORCEON = GND, FORCEOFF = VCC, all R_IN idle, all T_IN idle 1 10 A Supply Current, Shutdown FORCEOFF = GND 1 10 A Supply Current, AutoShutdown Plus Disabled FORCEON = FORCEOFF = VCC, no load 0.3 1 mA 0.8 V LOGIC INPUTS AND RECEIVER OUTPUTS Input Logic Threshold Low T_IN, FORCEON, FORCEOFF Input Logic Threshold High T_IN, FORCEON, FORCEOFF VCC = 3.3V 2 VCC = 5.0V 2.4 Transmitter Input Hysteresis V 0.5 V Input Leakage Current T_IN, FORCEON, FORCEOFF 0.01 1 A Output Leakage Current R_OUT (MAX3244E/MAX3245E), receivers disabled 0.05 10 A Output Voltage Low IOUT = 1.6mA 0.4 V Output Voltage High IOUT = -1.0mA VCC - 0.6 VCC - 0.1 V RECEIVER INPUTS Input Voltage Range -25 Input Threshold Low TA = +25C Input Threshold High TA = +25C VCC = 3.3V 0.6 1.2 VCC = 5.0V 0.8 1.5 V V VCC = 3.3V 1.5 2.4 VCC = 5.0V 1.8 2.4 Input Hysteresis Input Resistance +25 0.5 V V TA = +25C 3 5 7 k Output Voltage Swing All transmitter outputs loaded with 3k to ground 5 5.4 V Output Resistance VCC = V+ = V- = 0V, transmitter outputs = 2V 300 10M TRANSMITTER OUTPUTS Output Short-Circuit Current Output Leakage Current www.maximintegrated.com VCC = 0V or 3V to 5.5V, VOUT = 12V, Transmitters disabled 60 mA 25 A Maxim Integrated 6 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Electrical Characteristics (continued) (VCC = +3V to +5.5V, C1-C4 = 0.1F, tested at 3.3V 10%; C1 = 0.047F, C2-C4 = 0.33F, tested at 5.0V 10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MOUSE DRIVEABILITY (MAX3244E/MAX3245E) T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3k to GND, T1OUT and T2OUT loaded with 2.5mA each Transmitter Output Voltage 5 V ESD PROTECTION R_IN, T_OUT IEC 1000-4-2 Air Discharge 15 IEC 1000-4-2 Contact Discharge 8 Human Body Model 15 kV AutoShutdown Plus (FORCEON = GND, FORCEOFF = VCC) Receiver Input Threshold to INVALID Output High Figure 4a Receiver Input Threshold to INVALID Output Low Figure 4a INVALID, READY Output Voltage Low (MAX3224E-MAX3227E) IOUT = -1.6mA INVALID, READY Output Voltage Low (MAX3224E-MAX3227E) IOUT = -1.0mA Positive threshold Negative threshold 2.7 -2.7 -0.3 V +0.3 V 0.4 V VCC - 0.6 V Receiver Positive or Negative Threshold to INVALID High tINVH VCC = 5V, Figure 4b 1 s Receiver Positive or Negative Threshold to INVALID Low tINVL VCC = 5V, Figure 4b 30 s Receiver or Transmitter Edge to Transmitters Enabled tWU VCC = 5V, Figure 5b (Note 2) 100 s Receiver or Transmitter Edge to Transmitters Shutdown www.maximintegrated.com tAUTOSHDN VCC = 5V, Figure 5b (Note 2) 15 30 60 s Maxim Integrated 7 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Timing Characteristics--MAX3224E/MAX3226E/MAX3244E (VCC = +3V to +5.5V, C1-C4 = 0.1F, tested at 3.3V 10%; C1 = 0.047F, C2-C4 = 0.33F, tested at 5.0V 10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL MIN RL = 3k, CL = 1000pF, one transmitter switching Maximum Data Rate Receiver Propagation Delay CONDITIONS tPHL tPLH TYP MAX 250 kbps 0.15 R_IN to R_OUT, CL = 150pF UNITS s 0.15 Receiver Output Enable Time Normal operation (MAX3244E only) 200 ns Receiver Output Disable Time Normal operation (MAX3244E only) 200 ns Transmitter Skew tPHL - tPLH (Note 3) 100 ns Receiver Skew tPHL - tPLH 50 ns VCC = 3.3V, TA = +25C, RL = 3k to 7k, measured from +3V to -3V or -3V to +3V, one transmitter switching Transition-Region Slew Rate CL = 150pF to 1000pF 6 30 V/s Timing Characteristics--MAX3225E/MAX3227E/MAX3245E (VCC = +3V to +5.5V, C1-C4 = 0.1F, tested at 3.3V 10%; C1 = 0.047F, C2-C4 = 0.33F, tested at 5.0V 10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL Maximum Data Rate Receiver Propagation Delay tPHL tPLH CONDITIONS MIN RL = 3k, CL = 1000pF, one transmitter switching 250 VCC = 3.0V to 4.5V, RL = 3k, CL = 250pF, one transmitter switching 1000 VCC = 4.5V to 5.5V, RL = 3k, CL = 1000pF, one transmitter switching 1000 TYP MAX kbps 0.15 R_IN to R_OUT, CL = 150pF UNITS s 0.15 Receiver Output Enable Time Normal operation (MAX3245E only) 200 ns Receiver Output Disable Time Normal operation (MAX3245E only) 200 ns Transmitter Skew tPHL - tPLH (Note 3) 25 ns Receiver Skew tPHL - tPLH 50 ns Transition-Region Slew Rate VCC = 3.3V, TA = +25C, RL = 3k to 7k, CL = 150pF to 1000pF, measured from +3V to -3V or -3V to +3V, one transmitter switching 24 150 V/s Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds. Note 3: Transmitter skew is measured at the transmitter zero cross points. www.maximintegrated.com Maxim Integrated 8 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Typical Operating Characteristics (VCC = +3.3V, 250kbps data rate, 0.1F capacitors, all transmitters loaded with 3k and CL, TA = +25C, unless otherwise noted.) -SLEW 10 +SLEW 8 6 4 VOUT- -5 -6 1000 2000 3000 4000 2 1000 3000 4000 1000 2000 3000 MAX3224-7/44/45E-03 4000 60 -SLEW 50 +SLEW 40 30 1 TRANSMITTER AT 1Mbps 1 TRANSMITTER AT 62.5kbps (MAX3225E) 1500 2000 2500 0 500 30 25 20 AVERAGE: 10 PARTS 10 30 1Mbps 0 0 500 2500 3000 1000 1500 2000 2500 LOAD CAPACITANCE (pF) MAX3224E-MAX3227E READY TURN-OFF TIME vs. TEMPERATURE MAX3224-7/44/45E-08 30 28 26 24 20 www.maximintegrated.com 1.5Mbps 40 2500 32 0 LOAD CAPACITANCE (pF) 2000 34 22 2000 1500 36 5 1500 1000 38 READY TURN-ON TIME (s) 1 TRANSMITTER AT 512kbps 1 TRANSMITTER AT 30kbps (MAX3225E) LOAD = 3k + CL 1000 50 MAX3224E-MAX3227E READY TURN-ON TIME vs. TEMPERATURE MAX3224-7/44/45E-07 50 500 2Mbps 60 LOAD CAPACITANCE (pF) MAX3225E/MAX3227E TRANSMITTER SKEW vs. LOAD CAPACITANCE 15 70 200 MAX3224-7/44/45E-09 1000 80 10 180 READY TURN-OFF TIME (ns) 500 1 TRANSMITTER AT FULL DATA RATE 1 TRANSMITTER AT 1/16 DATA RATE (MAX3225E) LOAD = 3k + CL 90 20 0 5000 100 SUPPLY CURRENT (mA) 70 LOAD CAPACITANCE (pF) 0 0 5000 MAX3224-7/44/45E-05 MAX3224-7/44/45E-04 1.5Mbps 80 -7.5 TRANSMITTER SKEW (ns) 2000 MAX3225E/MAX3227E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE 10 35 T1 TRANSMITTING AT 250kbps T2 (MAX3224E) TRANSMITTING AT 15.6kbps MAX3225E/MAX3227E SLEW RATE vs. LOAD CAPACITANCE -5.0 40 10 0 0 20 45 20kbps 15 MAX3225E/MAX3227E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 1Mbps 1 TRANSMITTER AT FULL DATA RATE 1 TRANSMITTER AT 1/16 DATA RATE (MAX3225E) LOAD = 3k + CL 1.5Mbps 1Mbps 2Mbps 0 20 LOAD CAPACITANCE (pF) 2Mbps -2.5 120kbps 25 LOAD CAPACITANCE (pF) 5.0 0 30 LOAD CAPACITANCE (pF) 7.5 2.5 250kbps 35 5 FOR DATA RATES UP TO 250kbps 0 5000 SLEW RATE (V/s) 0 TRANSMITTER OUTPUT VOLTAGE (V) 12 40 MAX3224-7/44/45E-06 -2 -3 -4 14 45 SUPPLY CURRENT (mA) T1 TRANSMITTING AT 250kbps T2 (MAX3224E) TRANSMITTING AT 15.6kbps 16 MAX3224-7/44/45E-02 VOUT+ SLEW RATE (V/s) 6 5 4 3 2 1 0 -1 MAX3224E/MAX3226E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE MAX3224E/MAX3226E SLEW RATE vs. LOAD CAPACITANCE MAX3224-7/44/45E-01 TRANSMITTER OUTPUT VOLTAGE (V) MAX3224E/MAX3226E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 160 140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) Maxim Integrated 9 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Typical Operating Characteristics (continued) (VCC = +3.3V, 250kbps data rate, 0.1F capacitors, all transmitters loaded with 3k and CL, TA = +25C, unless otherwise noted.) 10 8 6 4 0 1000 2000 3000 4000 1000 2000 3000 4000 1.5Mbps 1Mbps 1 TRANSMITTER AT FULL DATA RATE 2 TRANSMITTERS AT 1/16 DATA RATE 2Mbps 1.5Mbps 1Mbps 60 -5.0 -7.5 1200 1600 400 800 1200 1600 40 30 1Mbps 2000 MAX3224-7/44/45E-16 50 45 TRANSMITTER SKEW (ns) MAX3224-7/44/45E-15 1.5Mbps 40 35 30 25 20 15 10 1 TRANSMITTER AT FULL DATA RATE 2 TRANSMITTERS AT 1/16 DATA RATE 10 0 MAX3245E TRANSMITTER SKEW vs. LOAD CAPACITANCE 2Mbps 20 1 TRANSMITTER AT 1Mbps 2 TRANSMITTERS AT 62.5kbps MAX3245E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE 50 5000 20 LOAD CAPACITANCE (pF) 80 60 4000 30 LOAD CAPACITANCE (pF) 90 70 3000 40 0 2000 100 SUPPLY CURRENT (mA) 50 10 800 2000 LOAD CAPACITANCE (pF) MAX3224-7/44/45E-14 2Mbps 1000 70 SLEW RATE (V/s) MAX3224-7/44/45E-13 TRANSMITTER OUTPUT VOLTAGE (V) 5.0 400 0 5000 MAX3245E SLEW RATE vs. LOAD CAPACITANCE 7.5 0 20kbps 20 0 0 MAX3245E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE -2.5 30 LOAD CAPACITANCE (pF) 2.5 120kbps 10 LOAD CAPACITANCE (pF) 0 250kbps 40 0 5000 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps 50 2 VOUT- -5 -6 MAX3224-7/44/45E-12 12 60 SUPPLY CURRENT (mA) 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps MAX3224-7/44/45E-11 VOUT+ -2 -3 -4 14 SLEW RATE (V/s) 6 5 4 3 2 1 0 -1 MAX3244E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE MAX3244E SLEW RATE vs. LOAD CAPACITANCE MAX3224-7/44/45E-10 TRANSMITTER OUTPUT VOLTAGE (V) MAX3244E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 5 0 0 0 400 800 1200 1600 LOAD CAPACITANCE (pF) www.maximintegrated.com 2000 0 1000 2000 3000 LOAD CAPACITANCE (pF) Maxim Integrated 10 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Pin Description PIN MAX3224E MAX3225E TQFN DIP/ SSOP/ TSSOP MAX3226E MAX3227E TQFN SSOP/ TSSOP MAX3244E MAX3245E SO/ SSOP/ TSSOP MAX3245E TQFN NAME FUNCTION 19 1 14 1 -- -- READY Ready to Transmit Output, active-high. READY is enabled high when V- goes below -4V and the device is ready to transmit. 1 2 16 2 28 31 C1+ Positive Terminal of Voltage-Doubler Charge-Pump Capacitor 20 3 15 3 27 30 V+ +5.5V generated by the charge pump 2 4 1 4 24 26 C1- Negative Terminal of Voltage-Doubler Charge-Pump Capacitor 3 5 2 5 1 33 C2+ Positive Terminal of Inverting Charge-Pump Capacitor 4 6 3 6 2 34 C2- Negative Terminal of Inverting Charge-Pump Capacitor 5 7 4 7 3 35 V- 6, 15 8, 17 10 13 9, 10, 11 7, 8, 9 T_OUT 7, 14 9, 16 5 8 4-8 1-5 R_IN 8, 13 10, 15 6 9 15-19 15, 16, 17, 19, 20 R_OUT TTL/CMOS Receiver Outputs Valid Signal Detector Output, active low. A logic high indicates that a valid RS-232 level is present on a receiver input. -5.5V Generated by the Charge Pump RS-232 Transmitter Outputs RS-232 Receiver Inputs 9 11 7 10 21 23 INVALID 10, 11 12, 13 8 11 12-14 11, 12, 13 T_IN TTL/CMOS Transmitter Inputs FORCEON Force-On Input, ActiveHigh. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high) (Table 1). 12 14 www.maximintegrated.com 9 12 23 25 Maxim Integrated 11 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Pin Description (continued) PIN MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E SO/ SSOP/ TSSOP MAX3245E TQFN NAME 14 25 27 GND Ground 15 26 29 VCC +3.0V to +5.5V Single Supply Voltage Force-Off Input, Active-Low. MAX3225E, MAX3227E: When Force-Off input is low, transmitters are in high impedance, charge pumps are shutdown, and receivers are active. MAX3244E, MAX3245E: When Force-Off input is low, transmitters and receivers are in high impedance, charge pumps are shutdown, and only R2OUTB is active. Force-Off overrides AutoShutdown Plus and FORCEON (Table 1). TQFN DIP/ SSOP/ TSSOP TQFN SSOP/ TSSOP 16 18 11 17 19 12 FUNCTION 18 20 13 16 22 24 FORCEOFF -- -- -- -- 20 21 R2OUTB -- -- -- -- -- 6, 10, 14, 18, 22, 28, 32, 36 N.C. No Connection. Not internally connected. -- -- -- -- -- -- EP Exposed Pad. Solder the exposed pad to the ground plane or leave unconnected. Detailed Description Dual Charge-Pump Voltage Converter The MAX3224E-MAX3227E/MAX3244E/MAX3245E's internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), over the +3.0V to +5.5V range. The charge pump operates in discontinuous mode: if the output voltages are less than www.maximintegrated.com TTL/CMOS Noninverting Complementary Receiver Outputs. Always active. 5.5V, the charge pump is enabled; if the output voltages exceed 5.5V, the charge-pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies. The READY output (MAX3224E-MAX3227E) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when V- goes below -4V. Maxim Integrated 12 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E POWERMANAGEMENT UNIT OR KEYBOARD CONTROLLER 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus FORCEOFF FORCEON VCC INVALID MAX3244E MAX3245E PROTECTION DIODE PREVIOUS RS-232 VCC I Rx 5k UART CPU I/O CHIP WITH UART Tx GND RS-232 a) SHDN = GND OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN. VCC TO P LOGIC TRANSITION DETECTOR Figure 1. Interface Under Control of PMU I RS-232 Transmitters PROTECTION DIODE The transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels. The MAX3224E/MAX3226E/MAX3244E guarantee a 250kbps data rate (1Mbps, for the MAX3225E/MAX3227E/ MAX3245E) with worst-case loads of 3k in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink(R)). Transmitters can be paralleled to drive multiple receivers. Figure 1 shows a complete system connection. When FORCEOFF is driven to ground or when the AutoShutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than 30s, the transmitters are disabled and the outputs go into a highimpedance state. When powered off or shut down, the outputs can be driven to 12V. The transmitter inputs do not have pullup resistors. Connect unused inputs to GND or VCC. LapLink is a registered trademark of Laplink Software, Inc. www.maximintegrated.com MAX3244E MAX3245E R2OUTB VCC Rx THREE-STATED UART 5k Tx GND b) R2IN R2OUT T1IN T1OUT FORCEOFF = GND NEW MAX3244E/MAX3245E: IN SHUTDOWN, R2OUTB IS USED TO MONITOR EXTERNAL DEVICES AND R2OUT IS THREE STATED, ELIMINATING A CURRENT PATH THROUGH THE UART'S PROTECTION DIODE. Figure 2. The MAX3244E/MAX3245E detect RS-232 activity when the UART and interface are shut down. Maxim Integrated 13 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Table 1. Output Control Truth Table RECEIVER OR TRANSMITTER EDGE WITHIN 30s T_OUT R_OUT (MAX3224E/ MAX3225E/ MAX3226E/ MAX3227E) R_OUT (MAX3244E/ MAX3245E) R2OUTB (MAX3244E/ MAX3245E) FORCEON FORCEOFF VALID RECEIVER LEVEL Shutdown (Forced Off) X 0 X X High-Z Active High-Z Active Normal Operation (Forced On) 1 1 X X Active Active Active Active Normal Operation (AutoShutdown Plus) 0 1 X Yes Active Active Active Active Shutdown (AutoShutdown Plus) 0 1 X No High-Z Active Active Active Normal Operation INVALID* 1 Yes X Active Active Active Active Normal Operation INVALID* 1 X Yes Active Active Active Active Shutdown INVALID* 1 No No High-Z Active Active Active Normal Operation (AutoShutdown) INVALID* INVALID** Yes X Active Active Active Active Shutdown (AutoShutdown) INVALID* INVALID** No X High-Z Active High-Z Active OPERATION STATUS X = Don't care * INVALID connected to FORCEON ** INVALID connected to FORCEON and FORCEOFF RS-232 Receivers The receivers convert RS-232 signals to CMOS-logic output levels. The MAX3224E-MAX3227E feature inverting outputs that always remain active (Table 1). The MAX3244E/MAX3245E have inverting three-state outputs that are high impedance when shut down (FORCEOFF = GND) (Table 1). The MAX3244E/MAX3245E feature an extra, always active, noninverting output, R2OUTB. R2OUTB output monitors receiver activity while the other receivers are high impedance, allowing ring indicator applications to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where VCC is set to ground in shutdown to accommodate peripherals such as UARTs (Figure 2). www.maximintegrated.com The MAX3224E-MAX3227E/MAX3244E/MAX3245E feature an INVALID output that is enabled low when no valid RS-232 voltage levels have been detected on all receiver inputs. Because INVALID indicates the receiver input's condition, it is independent of FORCEON and FORCEOFF states (Figures 3 and 4). AutoShutdown Plus Mode The MAX3224E-MAX3227E/MAX3244E/MAX3245E achieve a 1A supply current with Maxim's AutoShutdown Plus feature, which operates when FORCEOFF is high and a FORCEON is low. When these devices do not sense a valid signal transition on any receiver and transmitter input for 30s, the on-board charge pumps are shut down, reducing supply current to 1A. This occurs if the RS-232 cable is disconnected or if the connected Maxim Integrated 14 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +0.3V T_IN R_IN 30s TIMER R -0.3V INVALID R_IN EDGE DETECT +2.7V S 30s TIMER EDGE DETECT INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30s. Figure 3a. INVALID Functional Diagram, INVALID Low FORCEOFF R FORCEON Figure 3c. AutoShutdown Plus Logic FORCEOFF 30s TIMER R -2.7V INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V FOR LESS THAN 30s. Figure 3b. INVALID Functional Diagram, INVALID High Table 2. INVALID Truth Table RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT INVALID OUTPUT Yes High No Low peripheral transmitters are turned off, and the UART driving the transmitter inputs is inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input. As a result, the system saves power without changes to the existing BIOS or operating system. Figures 3a and 3b depict valid and invalid RS-232 receiver voltage levels. INVALID indicates the receiver input's condition, and is independent of FORCEON and FORCEOFF states. Figure 3 and Tables 1 and 2 summarize the operating modes of the MAX3224E-MAX3227E/ MAX3244E/MAX3245E. FORCEON and FORCEOFF override AutoShutdown Plus circuitry. When neither control is asserted, the IC selects between these states automatically based on the last receiver or transmitter input edge received. www.maximintegrated.com POWERDOWN* FORCEON INVALID AUTOSHDN * POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES. Figure 3d. Power-Down Logic When shut down, the device's charge pumps turn off, V+ is pulled to VCC, V- is pulled to ground, the transmitter outputs are high impedance, and READY (MAX3224E- MAX3227E) is driven low. The time required to exit shutdown is typically 100s (Figure 8). By connecting FORCEON to INVALID, the MAX3224E- MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level and no receiver or transmitter edge is detected for 30s, and wake up when a valid receiver level or receiver or transmitter edge is detected. INVALID HIGH +2.7V RECEIVER INPUT LEVELS R_IN AUTOSHDN INDETERMINATE +0.3V 0 INVALID LOW -0.3V INDETERMINATE -2.7V INVALID HIGH Figure 4a. Receiver Positive/Negative Thresholds for INVALID Maxim Integrated 15 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus RECEIVER INPUTS INVALID } REGION TRANSMITTER INPUTS TRANSMITTER OUTPUTS INVALID OUTPUT VCC tINVL 0 tINVH tAUTOSHDN tAUTOSHDN tWU tWU *VCC READY 0 V+ VCC 0 V- *MAX3224E-MAX3227E Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram By connecting FORCEON and FORCEOFF to INVALID, the MAX3224E-MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level is detected and wake up when a valid receiver level is detected (same functionality as AutoShutdown feature on MAX3221E/MAX3223E/ MAX3243E). A mouse or other system with AutoShutdown Plus may need time to wake up. Figure 5 shows a circuit that forces the transmitters on for 100ms, allowing enough time for the other system to realize that the MAX3244E/ MAX3245E is awake. If the other system outputs valid RS-232 signal transitions within that time, the RS-232 ports on both systems remain enabled. Software-Controlled Shutdown If direct software control is desired, use INVALID to indicate DTR or ring indicator signal. Tie FORCEOFF and FORCEON together to bypass the AutoShutdown Plus so the line acts like a SHDN input. 15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic www.maximintegrated.com discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3224E- MAX3227E/MAX3244E/MAX3245E have extra protection against static electricity. Maxim's engineers have developed state-of-the-art structures to protect POWERMANAGEMENT UNIT MASTER SHDN LINE 0.1F 1M FORCEOFF FORCEON MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a Mouse or Another System Maxim Integrated 16 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus RC 50M to 100M RD 1500 DISCHARGE RESISTANCE CHARGE CURRENT LIMIT RESISTOR DEVICE UNDER TEST STORAGE CAPACITOR Figure 6a. Human Body ESD Test Model HIGHVOLTAGE DC SOURCE Cs 150pF RD 330 DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Figure 7a. IEC 1000-4-2 ESD Test Model I IP 100% 90% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 100% 90% AMPERES I PEAK 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM 10% Figure 6b. Human Body Current Waveform these pins against ESD of 15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim's E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup. t r = 0.7ns to 1ns t 30ns 60ns Figure 7b. IEC 1000-4-2 ESD Generator Current Waveform ESD Test Conditions ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits: ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. 1) 15kV using the Human Body Model 2) 8kV using the Contact-Discharge Method specified in IEC 1000-4-2 3) 15kV using IEC 1000-4-2's Air-Gap Method. Figure 6a shows the Human Body Model and Figure 6b shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5k resistor. www.maximintegrated.com Human Body Model Maxim Integrated 17 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3224E-MAX3227E, MAX3244E/MAX3245E help you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 7a shows the IEC 1000-4-2 model and Figure 7b shows the current waveform for the 8kV, IEC 1000-4-2, Level 4, ESD Contact-Discharge Method. The Air-Gap Method involves approaching the device with a charged probe. The Contact-Discharge Method connects the probe to the device before the probe is energized. Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. Of course, all pins require this protection during manufacturing, not just RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports. Applications Information Capacitor Selection The capacitor type used for C1-C4 is not critical for proper operation; polarized or nonpolarized capacitors Table 3. Required Minimum Capacitance Values V CC (V) C1, C BYPASS (F) C2, C3, C4 (F) 3.0 to 3.6 0.22 0.22 3.15 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.22 1 www.maximintegrated.com 5V/div 0 FORCEON = FORCEOFF T1OUT 2V/div 0 5V/div 0 VCC = 3.3V C1-C4 = 0.1F T2OUT READY 5s/div Figure 8. Transmitter Outputs when Exiting Shutdown or Powering Up can be used. The charge pump requires 0.1F capacitors for 3.3V operation. For other supply voltages, see Table 3 for required capacitor values. Do not use values smaller than those listed in Table 3. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1's value. However, do not increase C1 without also increasing the values of C2, C3, C4, and CBYPASS, to maintain the proper ratios (C1 to the other capacitors). When using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor's equivalent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V-. Power-Supply Decoupling In most circumstances, a 0.1F VCC bypass capacitor is adequate. In applications that are sensitive to powersupply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible. Transmitter Outputs when Exiting Shutdown Figure 8 shows two transmitter outputs when exiting shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS-232 levels (one transmitter input is high, the other is low). Each Maxim Integrated 18 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus transmitter is loaded with 3k in parallel with 1000pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately -3V. 5V/div T1IN High Data Rates The MAX3224E/MAX3226E/MAX3244E maintain the RS-232 5.0V minimum transmitter output voltage even at high data rates. Figure 9 shows a transmitter loopback test circuit. Figure 10 shows a loop-back test result at 120kbps, and Figure 11 shows the same test at 250kbps. For Figure 10, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 11, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 250pF. The MAX3225E/MAX3227E/MAX3245E maintain the RS-232 5.0V minimum transmitter output voltage at data rates up to 1Mbps (MegaBaud). Figure 12 shows a loopback test result with a single transmitter driven at 1Mbps and all transmitters loaded with an RS-232 receiver in parallel with 250pF. 5V/div T1OUT 5V/div R1OUT VCC = 3.3V 2s/div Figure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 120kbps T1IN 5V/div T1OUT 5V/div VCC CBYPASS 5V/div R1OUT VCC C1+ C1 C1C2+ C2 C2- MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E 2s/div C3* Figure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 250kbps VC4 T1IN 5V/div T1OUT 5V/div R_ IN R_ OUT 5k FORCEON FORCEOFF V+ T_ OUT T_ IN VCC VCC = 3.3V 1000pF GND 5V/div R1OUT VCC = 3.3V *C3 CAN BE RETURNED TO VCC OR GND. Figure 9. Loopback Test Circuit www.maximintegrated.com 200ns/div Figure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test Result at 1Mbps Maxim Integrated 19 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +3.3V 26 0.1F VCC 28 C1+ C1 0.1F 24 1 C2 0.1F 2 LOGIC INPUTS 27 V+ C3 0.1F C1C2+ MAX3244E MAX3245E V- COMPUTER SERIAL PORT 3 C4 0.1F C2- 14 T1IN T1OUT 9 +V 13 T2IN T2OUT 10 +V 12 T3IN T3OUT 11 -V 20 R2OUTB 19 R1OUT GND R1IN Tx 4 5k 18 R2OUT R2IN LOGIC OUTPUTS 5 5k 17 R3OUT R3IN 6 RS-232 INPUTS 5k 16 R4OUT R4IN 7 5k 15 23 VCC TO POWERMANAGEMENT UNIT 22 21 R5OUT R5IN 8 SERIAL MOUSE 5k FORCEON FORCEOFF INVALID GND 25 Figure 13a. Mouse Driver Test Circuit www.maximintegrated.com Maxim Integrated 20 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Mouse Driveability VOUT+ VCC = 3.0V The MAX3244E/MAX3245E are specifically designed to power serial mice while operating from low-voltage power supplies. They have been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3244E/MAX3245E successfully drove all serial mice tested and met their respective current and voltage requirements. The MAX3244E/MAX3245E dual charge pump ensures the transmitters supply at least 5V during worst-case conditions. Figure 13b shows the transmitter output voltages under increasing load current. Figure 13a shows a typical mouse connection. MAX2343E-FIG15 TRANSMITTER OUTPUT VOLTAGE (V) 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 VOUT+ VCC VOUTVOUT- Interconnection with 3V and 5V Logic 0 1 2 3 4 5 6 7 8 9 The MAX3224E-MAX3227E/MAX3244E/MAX3245E can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 4 for more information on possible combinations of interconnections. 10 LOAD CURRENT PER TRANSMITTER (mA) Figure 13b. MAX324_E Transmitter Output Voltage vs. Load Current per Transmitter Table 5 lists other Maxim ESD-powered transceivers. Table 4. Logic Family Compatibility with Various Supply Voltages SYSTEM POWER-SUPPLY VOLTAGE (V V CC SUPPLY VOLTAGE (V) 3.3 3.3 5 5 5 3.3 COMPATIBILITY Compatible with all CMOS families Compatible with all TTL and CMOS families Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS Table 5. 15kV ESD-Protected, 3.0V to 5.5V Powered RS-232 Transceivers from Maxim PART SUPPLY VOLTAGE RANGE (V) NO. OF Tx/Rx AutoShutdown Human Body Model (kV) IEC 1000-4-2 Contact Discharge (kV) IEC 1000-4-2 Air-Gap Discharge (kV) GUARANTEED DATA RATE (kbps) MAX3241E +3.0 to +5.5 3/5 300 -- -- 15 8 15 250 MAX3243E +3.0 to +5.5 3/5 MAX3244E +3.0 to +5.5 3/5 1 -- Yes 15 8 15 250 1 Yes -- 15 8 15 250 MAX3245E +3.0 to +5.5 3/5 1 Yes -- 15 8 15 1Mbps MAX3232E MAX3222E +3.0 to +5.5 2/2 300 -- -- 15 8 15 250 +3.0 to +5.5 2/2 300 -- -- 15 8 15 250 MAX3223E +3.0 to +5.5 2/2 1 -- Yes 15 8 15 250 MAX3224E +3.0 to +5.5 2/2 1 Yes -- 15 8 15 250 MAX3225E +3.0 to +5.5 2/2 1 Yes -- 15 8 15 1Mbps MAX3221E +3.0 to +5.5 1/1 1 -- Yes 15 8 15 250 MAX3226E +3.0 to +5.5 1/1 1 Yes -- 15 8 15 250 MAX3227E +3.0 to +5.5 1/1 1 Yes -- 15 8 15 1Mbps www.maximintegrated.com SUPPLY AutoCURRENT Shutdown (A) Plus Maxim Integrated 21 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Typical Operating Circuits +3.3V +3.3V 15 0.1F CBYPASS 2 C1+ C1 0.1F 4 C15 C2 0.1F 6 C2+ VCC V+ MAX3226E* MAX3227E V- 3 7 C2- 11 T1IN 9 R1OUT C3 0.1F C1 0.1F C4 0.1F C2 0.1F 12 READY 1 2 27 C3 0.1F C1C2+ C2- MAX3244E*** MAX3245E V- 3 C4 0.1F T1OUT 9 R1IN 8 13 T2IN T2OUT 10 12 T3IN T3OUT 11 FORCEOFF 16 FORCEON 24 V+ 14 T1IN INVALID 10 AutoShutdown Plus 28 C1+ VCC T1OUT 13 5k 1 26 CBYPASS 0.1F GND TO POWERMANAGEMENT UNIT VCC 22 FORCEOFF 23 FORCEON AutoShutdown Plus INVALID 21 20 R2OUTB 14 19 R1OUT R1IN 4 18 R2OUT R2IN 17 R3OUT R3IN 6 16 R4OUT R4IN 7 15 R5OUT R5IN 8 +3.3V CBYPASS C1 0.1F 2 C1+ 4 C15 C2 0.1F TTL/CMOS INPUTS 19 0.1F 6 C2+ VCC V+ MAX3224E** MAX3225E V- 3 C3 0.1F 7 C2- 13 T1IN T1OUT 17 12 T2IN T2OUT 8 C4 0.1F RS-232 OUTPUTS GND R1IN 16 15 R1OUT TTL/CMOS OUTPUTS RS-232 INPUTS 5k R2IN 9 10 R2OUT 5 25 5k 1 14 READY AutoShutdown Plus INVALID 11 FORCEOFF 20 FORCEON GND TO POWERMANAGEMENT UNIT VCC *MAX3226E/MAX3227E PIN OUT REFERS TO SSOP/TSSOP PACKAGES. **MAX3224E/MAX3225E PIN OUT REFERS TO DIP/ SSOP/TSSOP PACKAGES. ***MAX3244E/MAX3245E PIN OUT REFERS TO SO/SSOP/TSSOP PACKAGES. 18 www.maximintegrated.com Maxim Integrated 22 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Pin Configurations READY 1 + 20 FORCEOFF C2+ 1 C2- 2 15 VCC C1+ 2 19 VCC 14 GND V+ 3 18 GND 13 T1OUT C1- 4 C2+ 5 12 FORCEON C2+ 5 C2- 6 11 T1IN C2- 6 V+ 3 MAX3226E MAX3227E C1- 4 V- 7 V- 7 10 INVALID T2OUT 9 R1OUT R1IN 8 SSOP/TSSOP R1IN R1OUT FORCEON T1IN 15 14 13 12 11 VCC 17 MAX3224E MAX3225E FORCEOFF 18 READY 19 *EP V+ 20 3 4 5 C1+ C1- C2+ C2- V- 12 11 T1OUT GND VCC TOP VIEW 10 26 VCC 25 GND 16 R1IN R2IN 5 15 R1OUT R3IN 6 14 FORCEON R4IN 7 22 FORCEOFF MAX3244E 24 C1MAX3245E 23 FORCEON 13 T1IN R5IN 8 21 INVALID 12 T2IN T1OUT 9 20 R2OUTB 11 INVALID T2OUT 10 19 R1OUT T3OUT 11 18 R2OUT T3IN 12 17 R3OUT T2IN 13 16 R4OUT T1IN 14 15 R5OUT 10 T2IN 9 INVALID 8 R2OUT 7 R2IN 6 T2OUT FORCEON 2 TQFN V- 3 R1IN 4 8 + 1 27 V+ 17 T1OUT DIP/SSOP/TSSOP GND 16 28 C1+ R2IN 9 R2OUT 10 T1OUT TOP VIEW MAX3224E MAX3225E 9 SO/SSOP/TSSOP TOP VIEW N.C. C1+ 2 + + C2+ N.C. C1+ V+ VCC N.C. 16 FORCEOFF VC2- + READY 1 36 35 34 33 32 31 30 29 28 R1IN R2IN 1 27 2 26 R3IN R4IN R5IN N.C. 3 T1OUT T2OUT T3OUT 25 MAX3245E 4 24 5 23 6 22 7 21 8 *EP 9 GND C1FORCEON FORCEOFF INVALID 20 N.C. R2OUTB R1OUT 19 R2OUT MAX3226E MAX3227E READY 14 V+ 15 C1+ 16 *EP 7 INVALID 6 R1OUT 5 R1IN N.C. T1IN R3OUT 8 N.C. FORCEOFF 13 T3IN T2IN T1IN N.C. R5OUT R4OUT 10 11 12 13 14 15 16 17 18 TQFN C2+ 3 4 V- 2 C2- 1 C1- + TQFN www.maximintegrated.com *CONNECT EP TO GND. Maxim Integrated 23 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Ordering Information (continued) TEMP RANGE PIN-PACKAGE -40C to +85C 16 TQFN-EP* MAX3227EEUE+ -40C to +85C 16 TSSOP MAX3227EAAE+ -40C to +125C 16 SSOP 20 Plastic DIP MAX3244ECWI+ 0C to +70C 28 Wide SO 20 TQFN -EP* MAX3244ECAI+ 0C to +70C 28 SSOP -40C to +85C 20 TSSOP MAX3244ECUI+ 0C to +70C 28 TSSOP -40C to +85C 20 TSSOP MAX3244EEWI+ -40C to +85C 28 Wide SO MAX3225EEAP+ -40C to +85C 20 SSOP MAX3244EEAI+ -40C to +85C 28 SSOP MAX3225EEPP+ -40C to +85C 20 Plastic DIP MAX3244EEUI+ -40C to +85C 28 TSSOP MAX3225EAAP+ -40C to +85C 20 SSOP MAX3245ECWI+ 0C to +70C 28 Wide SO MAX3226ECTE+ 0C to +70C 16 TQFN-EP* MAX3245ECAI+ 0C to +70C 28 SSOP MAX3226ECUE+ 0C to +70C 16 TSSOP MAX3245ECTX+ 0C to +70C 36 TQFN- EP* MAX3226ECAE+ 0C to +70C 16 SSOP MAX3245EEAI+ -40C to +85C 28 SSOP MAX3226EEAE+ -40C to +85C 16 SSOP MAX3245EEWI+ -40C to +85C 28 WIDE SO MAX3226EETE+ -40C to +85C 16 TQFN-EP* MAX3245EEUI+ -40C to +85C 28 TSSOP MAX3226EEUE+ -40C to +85C 16 TSSOP MAX3245EETX+ -40C to +85C 36 TQFN- EP* MAX3226EAAE+ -40C to +125C 16 SSOP MAX3227ECAE+ 0C to +70C 16 SSOP MAX3227ECTE+ 0C to +70C 16 TQFN-EP* MAX3227ECUE+ 0C to +70C 16 TSSOP MAX3227EEAE+ -40C to +85C 16 SSOP MAX3227EEAE/V+ -40C to +85C 16 SSOP PART TEMP RANGE PIN-PACKAGE PART MAX3225ECUP+ 0C to +70C 20 TSSOP MAX3227EETE+ MAX3225ECTP+ 0C to +70C 20 TQFN-EP* MAX3225ECAP+ 0C to +70C 20 SSOP MAX3225ECPP+ 0C to +70C MAX3225EETP+ -40C to +85C MAX3225EEUP+ MAX3225EEUP/V+ www.maximintegrated.com +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. /V denotes an automotive qualified part. Chip Information PROCESS: BiCMOS Maxim Integrated 24 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ MAX3244E/MAX3245E 15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 10 3/11 Added an automotive qualified part to the Ordering Information; changed all the parts listed in the Ordering Information to lead free 11 11/18 Updated Applications, Absolute Maximum Ratings, Package Information, Electrical Characteristics, Pin Description, and Ordering Information DESCRIPTION 1, 20 1-5, 12, 24 For pricing, delivery, and ordering information, please visit Maxim Integrated's online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2018 Maxim Integrated Products, Inc. 25