General Description
The MAX13223E is a +3.0V to +5.5V-powered EIA/TIA-
232 and V.28 communications interface with fault protec-
tion on the RS-232 line interface. This allows shorts of the
transmitter outputs and receiver inputs to voltages in the
±70V range without adversely affecting the MAX13223E.
The MAX13223E achieves 1µA supply current using
Maxim’s AutoShutdown™ feature. The MAX13223E
automatically enters a low-power shutdown mode when
the RS-232 cable is disconnected or the receivers are
inactive. The device turns on again when a valid transi-
tion at any receiver input is sensed. A proprietary, high-
efficiency, dual charge-pump power supply and a
low-dropout transmitter combine to deliver true RS-232
performance from a single +3.0V to +5.5V supply.
The MAX13223E has two receivers and two drivers and is
guaranteed to run at data rates of 250kbps for one trans-
mitter switching while maintaining RS-232 output levels.
The MAX13223E operates from input voltages ranging
from +3.0V to +5.5V and is available in a 20-pin, 6.5mm
x 4.4mm, TSSOP package. The MAX13223E is speci-
fied over the -40°C to +85°C temperature range.
Applications
Automotive
Telematics Equipment
Base Stations
Utility Meters
Industrial Equipment
Telecomm Equipment
POS Terminal Equipment
Features
♦±70V Fault Protection
♦+3.0V to +5.5V Supply Voltage
♦Overvoltage Current Limiting
♦Current Protection at Transmitter Outputs
♦AutoShutdown
♦250kbps (Max) Data Rate
♦Low Current Consumption in Shutdown 1µA (typ)
♦Thermal Shutdown Protection
♦±8kV IEC 61000-4-2 Contact-Discharge Method
♦-40°C to +85°C Operating Temperature Range
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4585; Rev 1; 2/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
PART TEMP RANGE PIN-PACKAGE
MAX13223EEUP+ -40°C to +85°C 20 TSSOP
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
MAX13223E
FORCEON
EN
R2OUT
R1OUT
FORCEOFF
INVALID
R2IN
GND
RS-232
OUTPUTS
TTL/CMOS
INPUTS T2IN
T1IN
R1IN
T2OUT
T1OUT
V-
V+
VCC
VCC
VCC
RS-232
INPUTS
TO POWER-
MANAGEMENT
UNIT
TTL/CMOS
OUTPUTS
C3
CBYPASS
0.1μF
C4
5kΩ
5kΩ
C2-
C2+
C2
C1-
C1+
C1
Typical Operating Circuit
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA= +25°C, unless other-
wise noted. For VCC = +3.0V to +3.6V, C1 = C2 = C3 = 0.1µF, C4 = 1µF. For VCC = +4.5V to +5.5V, C1 = 47nF, C2 = C3 = 330nF,
C4 = 1µF.) (Note 2)
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.
(Voltages referenced to GND.)
VCC ...................................................................... -0.3V to +7.0V
V+ ..........................................................................-0.3V to +7.0V
V- ...........................................................................+0.3V to -7.0V
V+ to V- ................................................................................+13V
Input Voltages
T1IN, T2IN, EN, FORCEON, FORCEOFF ..........-0.3V to +6.0V
R1IN, R2IN .......................................................................±70V
Output Voltages
T1OUT, T2OUT ................................................................±70V
R1OUT, R2OUT, INVALID ......................-0.3V to (VCC + 0.3V)
Short-Circuit Duration
T1OUT, T2OUT.......................................................Continuous
Continuous Power Dissipation (TA= +70°C)
TSSOP (derate 13.6mW/°C above +70°C) ................1084mW
Operating Temperature Range .......................... -40°C to +85°C
Junction Temperature..................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TSSOP
Junction-to-Ambient Thermal Resistance (θJA) ........73.8°C/W
Junction-to-Case Thermal Resistance (θJC) ................20°C/W
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage VCC 3.0 5.5 V
Supply Current AutoShutdown disabled (FORCEON =
FORCEOFF = VCC), no load 8 15 mA
Supply Current AutoShutdown IASD FORCEON = GND, FORCEOFF = VCC,
R1IN and R2IN idle, T1IN and T2IN idle 1.0 10 μA
Supply Current Shutdown ISD FORCEOFF = GND 1.0 10 μA
LOGIC INPUTS
Input-Logic Low VT_IN,LO T_IN, EN, FORCEON, FORCEOFF,
VCC = +3.3V to +3.6V, +5.0V to +5.5V 0.8 V
VCC = +3.3V 2.0
Input-Logic High VT_IN,HI T_IN, FORCEON,
FORCEOFF,EN VCC = +5.0V 2.4
V
Transmitter Input Hysteresis VTX,INHYS 0.5 V
Input Leakage Current IIN,LKG T_IN, EN, FORCEON, FORCEOFF ±0.01 ±1 μA
RECEIVER OUTPUTS
Output Leakage Current IRX,OUT,LKG EN = VCC ±0.05 ±10 μA
Output-Voltage Low VRX,OUT,LO IOUT = 1.6mA 0.4 V
Output-Voltage High VRX,OUT,HI IOUT = -1.0mA VCC -
0.6
VCC -
0.2 V
Note 1: 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.maxim-ic.com/thermal-tutorial.
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA= +25°C, unless other-
wise noted. For VCC = +3.0V to +3.6V, C1 = C2 = C3 = 0.1µF, C4 = 1µF. For VCC = +4.5V to +5.5V, C1 = 47nF, C2 = C3 = 330nF,
C4 = 1µF.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INVALID OUTPUT (AutoShutdown (FORCEON = GND, FORCEOFF = VCC))
Positive level 2.7
Receiver-Input Level to INVALID
Output High
VRX_IN,
INV_HI Figure 6a Negative level -2.7 V
Receiver-Input Level to INVALID
Output Low
VRX_IN,
INV_LO Figure 6a -0.3 +0.3 V
INVALID Output-Voltage Low VRX,INV_LO IOUT = 1.6mA 0.4 V
INVALID Output-Voltage High VRX,INV_HI IOUT = -1.0mA VCC -
0.6 V
RECEIVER INPUTS
Input-Voltage Range VRX,IN (Note 3) -70 +70 V
Overvoltage Threshold |VRX,OVTHR| 24 28.3 32 V
VCC = +3.3V 0.6
Input Threshold Low VRX,LO VCC = +5.0V 0.8 V
VCC = +3.3V 2.4
Input Threshold High VRX,HI VCC = +5.0V 2.4 V
-24V < VR_IN < +24V (Note 3) 3 5 7
VCC = V+ = V- = 0V 35 250
Input Resistance RRX,INRES
+32V < |VR_IN| < +70V 35 250
k
TRANSMITTER OUTPUTS
Output-Voltage Swing VORL= 3k, Figure 4 ±5 ±6 V
Output Resistance RTX,ROUT VCC = V+ = V- = 0V, VT_OUT = ±2V 300
Overvoltage Protection Threshold |VTX,FB| 14 19 V
Output Short-Circuit Current ITX,SHORT T_OUT = GND ±80 mA
VT_OUT > VTX,FB 6
Overvoltage Current ITX,IFBOUT VT_OUT < -VTX,FB -6
mA
VT_OUT = +12V 450 900
Output Leakage Current in
Shutdown Mode ITX,LKG VT_OUT = -12V, VCC = 0V, or +3V to +5.5V
in shutdown mode -150 -80 μA
PROTECTION
Overvoltage Protection Range R1IN, R2IN, T1OUT, T2OUT -70 +70 V
ESD PROTECTION (Note 4)
IEC 6100-4-2 Contact Discharge ±8
R1IN, R2IN, T1OUT, T2OUT Human Body Model ±8
All Other Pins Human Body Model ±2
kV
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
4 _______________________________________________________________________________________
Note 2: All devices are 100% production tested at TA= +85°C. Specifications are over -40°C to +85°C and are guaranteed by design.
Note 3: Both receivers will operate over the ±70V input range. The input resistance increases with input voltage. The input resistance
will increase within 24V ≤|VR_IN| ≤32V.
Note 4: Guaranteed by design, not production tested.
Note 5: Transmitter skew is measured at the transmitter zero crosspoints.
Note 6: Output recovery time is the delayed time for the transmitter to enter normal operating mode after an overvoltage condition.
TIMING CHARACTERISTICS
(VCC = +3.0V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA= +25°C, unless other-
wise noted. For VCC = +3.0V to +3.6V, C1 = C2 = C3 = 0.1µF, C4 = 1µF. For VCC = +4.5V to +5.5V, C1 = 47nF, C2 = C3 = 330nF,
C4 = 1µF.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Maximum Data Rate DR RL = 3k, CL = 1000pF, one transmitter
switching, Figure 1 250 kbps
Receiver Positive or Negative
Threshold to INVALID High tINVH V
CC = 5V, Figure 6b 1 μs
Receiver Positive or Negative
Threshold to INVALID Low tINVL V
CC = 5V, Figure 6b 30 μs
Receiver Edge to Transmitters
Enabled tWU V
CC = 5V, Figure 6b 135 μs
Receiver-Output Enable Time tRX,EN Normal operation 200 ns
Receiver-Output Disable Time tRX,DIS Normal operation 200 ns
Receiver Skew |tPRHL - tPRLH| 50 ns
Transmitter Skew |tPTHL - tPTLH| (Note 5) 200 ns
tPRHL 0.3
Receiver Propagation Delay tPRLH
CL = 150pF, Figure 4 0.3 μs
tPTHL 0.8
Transmitter Propagation Delay tPTLH
CL= 1nF, RL= 3k, Figure 3 0.6 μs
Transmitter Fall Time or Rise
Time tR, tF Figure 3 0.3 μs
Transmitter Time to Exit
Shutdown tSHDN Figure 7 100 μs
Output Recovery Time tTX,REC C
L = 1nF, RL = 5k (Note 6) 100 μs
Transition-Region Slew Rate SROUT
VCC = +3.3V, RL = 3k to 7k, TA = +25°C,
measured from +3V to -3V or -3V to +3V,
one transmitter switching, CL = 1nF
6 30 V/μs
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
_______________________________________________________________________________________ 5
0
tPTHL
0
V0
-V0
T_IN
T_OUT
-3V
3V
tFtR
0
3V
-3V
VCC/2
tPTLH
VCC/2
VCC
Figure 3. Driver Propagation Delay
tPRHL tPRLH
1.3V 1.7V
VCC/2 VCC/2
VIL
V0H
V0L
R_IN
R_OUT
VIH
tR, tF ≤ 10ns
Figure 4. Receiver Propagation Delay
Timing Diagrams
CLRL
VO
T_IN T_OUT
Figure 1. Driver Test Circuit
T_IN T_OUT R_IN R_OUT
15pF
Figure 2. Receiver Test Circuit
Test Circuits
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
6 _______________________________________________________________________________________
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
-8
-6
-4
-2
0
2
4
6
8
0 1000 2000 3000 4000 5000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX13223E toc01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
VOUT+
VOUT-
0
22
20
18
16
14
12
10
8
6
4
2
0 5000
SLEW RATE
vs. LOAD CAPACITANCE
MAX13223E toc02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
20001000 3000 4000
+ SLEW
- SLEW
0
10
5
25
20
15
40
35
30
45
0 20001000 3000 4000 5000
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX13223E toc03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
TRANSMITTER TIME
TO EXIT SHUTDOWN
MAX13223E toc04
40μs/div
5V/div
2V/div
T2OUT
T1OUT
VCC = +3.3V
C1–C4 = 0.1μF
FORCEON =
FORCEOFF
Pin Configuration
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
VCC
GND
T1OUT
C1-
V+
C1+
R1IN
R1OUT
FORCEON
T1IN
T2OUT
V-
C2-
C2+
12
11
9
10
T2IN
R2OUT
R2IN
TSSOP
MAX13223E
INVALID
FORCEOFF
EN
TOP VIEW
Detailed Description
Figure 2 shows the receiver test circuit. Figure 3 shows
driver propagation delay and Figure 4 shows receiver
propagation delay.
Dual Charge-Pump Voltage Converter
The MAX13223E internal power supply consists of a
dual-mode regulated charge pump that provides output
voltages of +5.5V (doubling charge pump) and -5.5V
(inverting charge pump), regardless of the input volt-
age (VCC) over the +3.0V to +5.5V range. The charge
pumps operate in a discontinuous mode. If the output
voltages are less than 5.5V, the charge pumps are
enabled. If the output voltages exceed 5.5V, the charge
pumps are disabled. Each charge pump requires a fly-
ing capacitor (C1, C2) and a reservoir capacitor (C3,
C4) to generate the V+ and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that convert
logic levels to EIA/TIA-232/V.28 levels. They guarantee a
250kbps data rate with worst-case loads of 3kΩin parallel
with 1000pF, providing compatibility with PC-to-PC com-
munication software. The MAX13223E can operate at data
rates of 250kbps (max). Transmitters can be paralleled to
drive multiple receivers. When FORCEOFF is driven to
ground, or the AutoShutdown circuitry senses invalid volt-
age levels at all receiver inputs, the transmitters are dis-
abled and the outputs are forced into a high-impedance
state. Figure 5 shows a complete system connection.
RS-232 Receivers
The MAX13223E’s receivers convert RS-232 signals to
logic output levels. Both receiver outputs can be three-
stated using the EN input. In shutdown (FORCEOFF or
AutoShutdown), the MAX13223E’s receiver outputs are
active and asserted low if EN = Low (Table 1). Driving
EN high places the receivers’ outputs in a high-imped-
ance state.
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
_______________________________________________________________________________________ 7
Pin Description
PIN NAME FUNCTION
1EN Receiver Enable Control Input. Drive EN low for normal operation. Drive EN high to force the receiver outputs
(R1OUT, R2OUT) into a high-impedance state.
2 C1+ Positive Terminal of the Voltage Doubler Charge-Pump Capacitor
3 V+ +5.5V Generated by Charge Pump
4 C1- Negative Terminal of the Voltage Doubler Charge-Pump Capacitor
5 C2+ Positive Terminal of Inverting Charge-Pump Capacitor
6 C2- Negative Terminal of Inverting Charge-Pump Capacitor
7 V- -5.5V Generated by Charge Pump
8 T2OUT RS-232 Transmitter 2 Output
9 R2IN RS-232 Receiver 2 Input
10 R2OUT Receiver 2 Logic Output
11 INVALID Valid Signal Detector Output. INVALID is high if a valid RS-232 level is present on any receiver input.
12 T2IN Transmitter 2 Logic Input
13 T1IN Transmitter 1 Logic Input
14 FORCEON Active-High FORCEON Input. Drive FORCEON high to override AutoShutdown, keeping transmitters and
charge pump on (FORCEOFF must be high).
15 R1OUT Receiver 1 Logic Output
16 R1IN RS-232 Receiver 1 Input
17 T1OUT RS-232 Transmitter 1 Output
18 GND Ground
19 VCC +3.0V to +5.5V Supply Voltage. Bypass VCC with a 0.1µF ceramic capacitor located as close to the device
as possible.
20 FORCEOFF Active-Low FORCEOFF Input. Drive FORCEOFF low to shut down transmitters, receivers, and on-board
charge pumps, overriding AutoShutdown and FORCEON.
MAX13223E
AutoShutdown
The MAX13223E achieves 1µA supply current with
Maxim’s AutoShutdown feature, which operates when
FORCEON is low and FORCEOFF is high. When the
device senses no valid signal levels on both receiver
inputs for > 30µs (typ), the onboard charge pump and
drivers are shut off, reducing supply current to 1µA.
This occurs if the RS-232 cable is disconnected or the
connected peripheral transmitters are turned off. The
device turns on again when a valid level is applied to
either RS-232 receiver input. As a result, the system
saves power. Table 2 summarizes the MAX13223E’s
operating modes. FORCEON and FORCEOFF override
AutoShutdown. When neither control is asserted, the IC
selects between these states automatically, based on
receiver input levels. Figure 6a shows the input levels
and Figure 6b shows the timing diagram for
AutoShutdown operation.
Software-Controlled Shutdown
If direct software control is desired, INVALID can be
used to indicate a DTR or Ring indicator signal.
Connect FORCEOFF and FORCEON together to bypass
AutoShutdown; therefore, the line acts as a SHDN input.
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
8 _______________________________________________________________________________________
MAX13223E
UART
FORCEON
FORCEOFF
POWER-
MANAGEMENT
UNIT OR CPU INVALID
RS-232
Figure 5. Interface Under Control of PMU
Table 1. Receiver Control Truth Table
EN OPERATION MODE R_OUT
0Active (FORCEON), or
Active (AutoShutdown) Active
0Shutdown (FORCEOFF), or
Shutdown (AutoShutdown)
Active and
asserted low
1 Shutdown status is don’t care High impedance
RECEIVER INPUT
AutoShutdown, TRANSMITTER DISABLED,
1μA SUPPLY CURRENT
-2.7V
b)
a)
-0.3V
+2.7V
+0.3V
0
INDETERMINATE
INDETERMINATE
TRANSMITTER ENABLED, INVALID HIGH
TRANSMITTER ENABLED, INVALID HIGH
tINVL tINVH
tWU
V+
V-
0
+2.7V
+0.3V
-0.3V
-2.7V
0
VCC
VCC
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
OUTPUT
(V)
INVALID
REGION
Figures 6a and 6b. Trip Levels for Entering and Exiting
AutoShutdown
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; either polarized or nonpolarized
capacitors may be used. The charge pump requires
0.1µF 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, and C4 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) usu-
ally rises at low temperatures and influences the
amount of ripple on V+ and V-.
Power-Supply Decoupling
In most circumstances, a 0.1µF VCC bypass capacitor is
adequate. In applications that are sensitive to power-sup-
ply noise, decouple VCC to ground with a capacitor of the
same value as the charge-pump capacitor C1. Connect
bypass capacitors as close to the IC as possible.
Transmitter Outputs when
Exiting Shutdown
Figure 7 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els. Each transmitter is loaded with 3kΩin parallel with
2500pF. 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.
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
_______________________________________________________________________________________ 9
Table 2. AutoShutdown Control
INPUTS OUTPUTS
FORCEOFF FORCEON VALID RECEIVER INPUT
LEVEL
INVALID
OUTPUT OPERATION MODE T_OUT
0 X No 0 Shutdown (Forced Off) High-Z
0 X Yes 1 Shutdown (Forced Off) High-Z
1 0 No 0
Shutdown (AutoShutdown)
High-Z
1 0 Yes 1 Active (AutoShutdown) Active
1 1 No 0 Active (Forced On) Active
1 1 Yes 1 Active (Forced On) Active
Table 3. Required Capacitor Values
VCC (V)
C1, CBYPASS (µF) C2, C3 (µF)
C4 (µF)
3.0 to 3.6
0.1 0.1 1
4.5 to 5.5
0.047 0.33 1
X = Don’t Care.
40μs/div
5V/div
2V/div
T2OUT
T1OUT
VCC = +3.3V
C1–C4 = 0.1μF
FORCEON =
FORCEOFF
Figure 7. Transmitter Outputs when Exiting Shutdown or
Powering Up
MAX13223E
Fault Protection
The MAX13223E is designed to survive faults such as
direct shorts to power supplies, miswiring faults, con-
nector failures, and tool misapplications of the transmit-
ter outputs and receiver inputs to voltages in the ±70V
range without damage. This fault protection is applica-
ble in all modes of the MAX13223E: active, shutdown,
and powered down. Both receivers operate over the
±70V input range, but the termination resistor (RRX,I)
increases when |VR_IN| voltage exceeds ±32V.
A receiver’s input termination resistor reduces to its
nominal value if the input voltage reduces to within the
±24V range. The receiver inputs and transmitter out-
puts are independently fault protected.
±8kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. In using the MAX13223E, C4 must be a 1µF
capacitor for the extended ESD protection. The driver
outputs and receiver inputs of the MAX13223E have
extra protection against static electricity. Maxim’s engi-
neers have developed state-of-the-art structures to pro-
tect these pins against ESD of ±8kV 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. ESD
protection can be tested in various ways. The transmit-
ter outputs and receiver inputs of this product family are
characterized for protection to the following limits:
1) ±8kV using the Human Body Model
2) ±8kV using the Contact-Discharge Method speci-
fied in IEC 61000-4-2
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Human Body Model
Figure 8a shows the Human Body Model and Figure 8b
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 interest,
which is then discharged into the test device through a
1.5kΩresistor.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. It does not specifi-
cally refer to integrated circuits. The major difference
between tests done using the Human Body Model and
IEC 61000-4-2 is higher peak current in IEC 61000-4-2,
because series resistance is lower in the IEC 61000-4-2
model. Hence, the ESD withstand voltage measured to
IEC 61000-4-2 is generally lower than that measured
using the Human Body Model. Figure 9a shows the IEC
61000-4-2 model and Figure 9b shows the current
waveform for the ±8kV, IEC 61000-4-2, level 4, ESD
Contact-Discharge Method.
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
10 ______________________________________________________________________________________
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC
1MΩ
RD
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 8a. Human Body ESD Test Model
IP 100%
90%
36.8%
tRL TIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
0
AMPERES
Figure 8b. Human Body Current Waveform
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
______________________________________________________________________________________ 11
CHARGE CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
RC
50MΩ to 100MΩ
RD
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 9a. IEC 61000-4-2 ESD Test Model
tr = 0.7ns to 1ns
30ns
60ns
t
100%
90%
10%
IPEAK
I
Figure 9b. IEC 61000-4-2 ESD Generator Current Waveform
Chip Information
PROCESS: CMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.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
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
20 TSSOP U20+2 21-0066 90-0116
MAX13223E
±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 4/09 Initial release
1 2/11
Added soldering information to the Absolute Maximum Ratings section; updated the
Electrical Characteristics globals information for C1 = C2 = C3 = 0.1μF and C2 = C3
= 330nF; corrected the reference of VOUT to VT_OUT for the overvoltage current
parameter in the Electrical Characteristics table; added R_OUT to Figure 2; updated
the RS-232 Receivers section description and Table 1; added the land pattern no. to
the Package Information table
2, 3, 4, 5, 7,
8, 11
