19-1120; Rev 0; 9/496 MAXLAA +15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC General Description The MAX1406 is an RS-232 IC designed to meet the stringent electrostatic discharge (ESD) requirements of the European community. 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. The MAX1406 has three RS-232 transmitters and three RS-232 receivers, and is optimized for operation in printer, modem, and telecom applications. It is guaran- teed to run at data rates up to 230kbps, providing com- patibility with popular software for communicating with personal computers. Power-supply current is less than 500A for Ipp and Iss, and less than imA for Icc. Features @ Enhanced ESD Protection: 215kV Human Body Model +8kV [EC1000-4-2, Contact Discharge 215kV 1EC1000-4-2, Air-Gap Discharge @ Latchup Free During an ESD Event 16-Pin SSOP or SO Packages @ Guaranteed 230kbps Data Rate Flow-Through Pinout @ Pin Compatible with MC145406 90r7LXVIN The MAX1406 is pin and functionally compatible with the Ordering Information industry-standard MC 145406, so existing designs can PART TEMP. 7 instantly become Electromagnetic Compatibility (EMC) MAX1406CPE oC . = es : compliant. The MAX1406 is available in DIP and SO pack- tn astic ages, and in a tiny SSOP that reduces board space. MAX 1406CWE OC to +70C 16 Wide SO MAX1406CAE 0C to +70C 16 SSOP MAX1406C/D OC to +70C Dice* MAX1406EPE _-40C to +B5C 16 Plastic DIP Applications MAX1406EWE __-40C to +85C 16 Wide SO Telecommunications MAX1406EAE _-40C to +85C 16 SSOP Dice are specified at Ta = +25C, DC parameters only. Modems Printers Functional Diagram Instruments Equipment Meeting IEC 1000-4-2 PL O4ApF Lt Pin Configuration wh Yoo Veo Ve a OApF MAAXIAA OAuF L MAX1406 LL TOP VIEW J > THN q T10uT o0 [i is) ver T2N TOUT > T2 = > aun [2 | [15] ROUT TOUT [3 a aver an bl TN T3IN Poo Bet, ram [a] mario [3] rzout _ ROUT RAIN , veour [5 | iia] Tan t ran [6 | 11] Ra0uT < R2OUT <| RIN raout [7 1a] raw RRO RIN _ Ves [8] 9] 6np ~_ GND DIP/SO/SSOP aL MAAXLAA Maxim integrated Products 2-47 For free samples & the latest literature: http-/jwww.maxim-ic.com, or phone 1-800-998-8800MAX1406 +15kV ESD-Protected, EMC-Compiiant, 230kbps, 3-Tx/3-Rx RS-232 IC ABSOLUTE MAXIMUM RATINGS sec ceeeeatesaseeseneceeteneepaesaeeeaebasesieesaseeesanesasasssessensenee -0.3V to +7V Continuous Power Dissipation (Ta = +70C) .-0.3V to +14V DIP (derate 10.53mW/C above +70C) ....... cee deseseesesecensesvssesscavsssvsesassacsscseveessesscassesessecersucesees +0.3V to -14V Wide SO (derate 20.00mW/C above +70C) SSOP (derate 8.00mW/C above +70C) occ Operating Temperature Ranges MAX1406C_E ooo cece ceccneeeeeneneeenenereceneaeseneees OC to +70C MAX1406E_E |... eee 40C to +85C da seneeee cece ceeeseaesensenecesaaccenseeasenereseseaaatenesieseeneessieeee rece Storage Temperature Range .............. -65C to +160C OU -0.3V to (Voc + 0.3V) Lead Temperature (soldering, 10sec) o...0.. eres +300C Short-Circuit Duration Tout (one at a time) Continuous Rout (one at a time) Continuous 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 canditions 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. ELECTRICAL CHARACTERISTICS (Vcc = +4.8V to +5.5V, Vop = +10.8V to +13.2V, Vss = -10.8V to -13.2V, Ta = TMIN to Tax, unless otherwise noted. Typical values are at Ta = +25C.) PARAMETER i SYMBOL | CONDITIONS | MIN TYP MAX | UNITS DC CHARACTERISTICS Voc 45 5.5 Operating Voltage Range Vop 10.8 13.2 v Vss -13,2 -10.8 lec 230 1000 Supply Current Ipp No load 185 500 pA Iss 185 500 LOGIC Input Logic Threshold Low VILT TIN 08 Vv Input Logic Threshold High VIHT TLIN 2.0 v Input Leakage Current 0.01 1 HA Output Voltage Low VoLR R_out; ISINK = 3.2mA 0.4 Vv Output Voltage High VoHR | R_out; IsouRCE = 1mA Vcc - 0.6 v TRANSMITTER OUTPUTS Vop = 7.0V, Vss = -7.0V, RL = 3kQ +5.0 Output Voltage Swing Vop = 12V, Ves = -12V, RL = SK 295 Vv Transmitter Output Resistance Vcc = Vop = Vss = OV, VT_ouT = 2V 300 Q aoe Output Short-Circuit 35 260 mA RECEIVER INPUTS Operating Range * re | RS-232 Input Threshold Low 0.75 v RS-232 Input Threshold High 2.4 v RS-232 Input Hysteresis 0.65 Vv 2-48 PRAKIMM+15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC ELECTRICAL CHARACTERISTICS (continued) (Voc = +4.5V to +5.5V, Vop = +10.8V to +13.2V, Vss = -10.8V to -13.2V, Ta = Tain to Tmax, unless otherwise noted. Typical values are at Ta = +25C.) PARAMETER | SYMBOL | CONDITIONS MIN TYP = MAX | UNITS RECEIVER INPUTS (continued) RS-232 Input Resistance 3 5 7 kQ Receiver Output Short-Circuit Current #10 mA ESD CHARACTERISTICS Human Body Model 15 ESD Protection IEC 1000-4-2 (Contact Discharge) +8 kV 1EC1000-4-2 (Air-Gap Discharge) 15 TIMING CHARACTERISTICS (Ta = +25C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Transmitter Output Propagation _ _. = = Delay, Low to High tpLtHT | VoD = 12V, Vsg = -12V, RL = 3kQ, CL = 1000pF 4 us Transmitter Output Propagation = =- = _ Delay, High to Low tptut | Vo = 12V, Vss = -12V Ri = 3kQ2, CL = 1000pF 4 us Transmitter Propagation Delay text Vop = 12V, Veg = -12V RL = 3k, CL = 1000pF 0.4 us Skew, ItPLHT - tpHitl CL=1 F to } Voo = 12, Veg = -12V, Ssoopr 4 12 30 Transition Output Slew Rate SR Rie = 3kQ to 7kQ, measured Vips from +3V to -3Vor -3V to +3V_ | CL = SOpF to 8 12 30 1000pF Receiver Output Propagation = _ Delay, Low to High tPLHR | Voc = SV, CL = 50pF 40 | us Receiver Output Propagation . _ Delay, High to Low tPHLR | Voc = SV, CL = SOpF 40 | us Receiver Propagation Delay Voc = 5V, Ct = 50pF 0.4 us Skew, ItPLHR - tPHLRl 'SKR oe i = 50p) Ct = 150pF to 4120 Voc = SV, Vop = 12V, 2500pF Guaranteed Data Rate DR Veg = -12V, RL = 3k to 7kQ C= 50pF to kbps 1000pF 230 PRAXLIA 2-49 90PLXVIN+15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC Typical Operating Characteristics (Vcc = +5.0V, VoD = +12.0V, Vss = -12.0V, Ta = +25C, unless otherwise noted.) SUPPLY CURRENT SUPPLY CURRENT vs. SUPPLY VOLTAGE vs. LOAD CAPACITANCE MAX1406 20 15 10 5 0 5 SUPPLY CURRENT (ma) SUPPLY CURRENT (mA) -10 15 -20 108 4 12.0 12.6 13.2 0 1000 2000 3000 4000 5000 SUPPLY VOLTAGE (V) LOAD CAPACITANCE (pF) SLEW RATE TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE ve. LOAD CAPACITANCE 125 S100 uw 2 75 = a 50 a Ss = 5 25 4 & 0 L-2 TRANMITTERS AT DATA = 25 + OAD & 1 E 50 2 TRANMITTERS AT DATA RATE/16 =~ 3kQ + CL LOAD 2 15 --10.0 125 O 1000 2000 3000 4000 5000 @ 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF) LOAD CAPACITANCE (pF) 2-50 PRAXIAA+15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC Pin Description PIN NAME FUNCTION 1 Vpb Supply-Voltage Input, +10.8V to +13.2V 3,5,7 TIOUT, T2OUT,T3OUT Transmitter Outputs, swing between Vop and Vss 2,4,6 R1IN, R2iN, R3IN Receiver Inputs 8 Vss Supply-Valtage Input, -10.8V to -13.2V 9 GND Ground. Connect to system ground. 10, 12, 14 TSIN, T2IN, T1IN Transmitter inputs. Tie unused inputs to GND or Vcc. 41, 13, 15 R30UT, R2OUT, R1IOUT Receiver Outputs, swing between GND and Vcc 16 Vec Supply-Voltage Input, +4.5V to +5.5V Vox Vour ov SIGNAL a GENERATOR Figure 1. Slew-Rate Test Circuit and Timing Diagram Detailed Description RS-232 Transmitters The transmitters are inverting level translators that con- vert CMOS-logic input levels to an EIA/TIA-232 voltage between +5V and +13.2V, into a load between 3kQ and 7kQ. The MAX1406 guarantees a 230kbps data rate with a worst-case load of 3kQ and 1000pF, providing compatibility with PC-to-PC communication software. PA AKUSA When the power is off, the MAX1406 outputs are permit- ted to be driven up to +15V. The transmitter inputs do not have internal pull-up resistors. Connect unused inputs to GND or Vcc. RS-232 Receivers The receiver inputs invert and convert the RS-232 sig- nals to CMOS-logic output levels. The MAX1406 has hysteresis of 650mV. The receiver output swings between GND and Vcc. +15kV ESD Protection As with all Maxim devices, electrostatic discharge (ESD) protection structures are incorporated on all pins to protect against ESD encountered during handling and assembly. The MAX1406 driver outputs and receiv- er inputs have extra protection against static electricity found in normal operation. Maxims engineers devel- oped state-of-the-art structures to protect these pins against +15kV ESD without damage. After an ESD avent, the MAX1406 continues working without latchup. ESD protection can be tested in several ways. The transmitter outputs and the receiver inputs are charac- terized for protection to the following: 1) +15kV using the Human Body Model 2) +8kV using the Contact-Discharge method specified in 1EC1000-4-2 (formerly |EC801-2) 3) +15kV using the Air-Gap Discharge method speci- fied in 1EC1000-4-2 (formerly IEC801-2) ESD Test Conditions ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and resuits. 2-51 90P LXVMAX1406 +15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC Human Body Model Figure 2a shows the Human Body Model, and Figure 2b shows the current waveform it generates when dis- charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of inter- est, which is then discharged into the device through a 1.5kQ resistor. 1EC1000-4-2 The IEC 1000-4-2 standard covers ESD testing and per- formance of finished equipment; it does not specifically refer to integrated circuits. The MAX1406 helps you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without additional ESD-protection com- ponents. The main difference between tests done using the Human Body Model and [EC1000-4-2 is higher peak current in IEC 1000-4-2 (Figure 3). Because series resis- tance is lower in the IEC1000-4-2 ESD test model, the ESD withstand voltage measured to this standard is generally lower than that measured using the Human Body Model. Figure 3b shows the current waveform for the +8kV IEC1000-4-2 Level 4 ESD Contact-Discharge test. The Air-Gap test involves approaching the device with a charge probe. The Contact-Discharge method con- nects the probe to the device before the probe is ener- gized. Machine Model The Machine Model for ESD testing uses a 200pF stor- age capacitor and zero-discharge resistance. It mimics the stress caused by handling during manufacturing and assembly. Of course, ali pins (not just RS-232 inputs and outputs) require this protection during man- ufacturing. Therefore, the Machine Model is less rele- vant to the I/O ports than are the Human Body Model and IEC 1000-4-2. Re 1M Rp 15 CHARGE-CURRENT DISCHARGE LIMIT RESISTOR RESISTANCE HIGH- DEVICE VOLTAGE Cg 1 STORAGE UNDER ot 100pF J CAPACITOR TEST SOURCE a) Ip 100% if PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 9% AMPERES 36.8% | NN 0 0 TIME < t CURRENT WAVEFORM b) Fic 50M to 100M Rp 33022 CHARGE-CURRENT DISCHARGE LIMIT RESISTOR RESISTANCE HIGH- DEVICE VOLTAGE Cs L sTORAGE UNDER oC 1509F CAPACITOR TEST SOURCE a) l d 400% } wqeweneebe-- epee ee eee 90% |. \ Z ~y 10% t=0.7nsto Ins ped jeg 2013p a__- Ons __J b) Figure 2. Human Body ESD Test Model and ESD-Generator Current Waveform 2-52 Figure 3. 1EC1000-4-2 Test Model and ESD-Generator Current Waveform MAAXLSA+15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC Applications Information _CU Chip Topography Because the MAX1406 is not sensitive to power-supply sequencing, no external protection diodes are required. Any of the three supplies can power up first. However, @ieen e use proper layout techniques to ensure other devices Voo Vee wal, on your board are not damaged in case of an ESD - se, aA event. j RIN RIOUT Minimize the ground-lead return path to the power eS supply, because currents as high as 60A can pass 8) into the ground. Tour THIN e Use a separate return path to the power supply. Make trace widths greater than 40 mils. R2iN R20UT * Bypass Vcc, Vop, and Vss with 0.1pF capacitors as close to the MAX1406 as possible to ensure maxi- ate T20UT TN mum ESD protection. Tie any unused transmitter inputs to GND or Vcc to minimize power consumption. RSOUT RIN T3OUT T3IN q TRANSISTOR COUNT: 161 SUBSTRATE CONNECTED TO GND MAMAXILMA 2-53