MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
EVALUATION KIT AVAILABLE
General Description
The MAX3250 is a 3.0V to 5.5V powered, ±50V isolated
EIA/TIA-232 and V.28/V.24 communications interface
with high data-rate capabilities. The MAX3250 is a dual
die part that operates with up to ±50V difference
between the RS-232 side and the logic side (ISOCOM
to GND). This makes the device ideal for operation in
noisy conditions with high common-mode voltages.
This feature prevents damage to the device if RS-232
lines are inadvertently short-circuited to a +24V or ±48V
power bus.
The MAX3250 is powered by a single 3V to 5.5V supply
on the logic side. Power is transferred from the logic
side to the isolated side by ±100V external capacitors.
The MAX3250 has two receivers (Rx) and two drivers
(Tx) and is guaranteed to run at data rates of 250kbps
while maintaining RS-232 output levels. The trans-
ceivers have a proprietary low-dropout transmitter out-
put stage, delivering true RS-232 performance from a
3V to 5.5V supply with a dual charge pump. The device
features a FAULT open-drain output to signal an exces-
sive isolated-side voltage condition on any of the RS-
232 inputs. This output can drive an alarm LED or can
be monitored by the processor to prevent operation
under these conditions. The receiver outputs are high
impedance in shutdown, allowing multiple interfaces
(IrDA, RS-232, RS-485) to be connected to the same
UART.
The MAX3250 is available in a space-saving 28-pin
SSOP package.
Applications
Industrial Control
Programmable Logic Controller
Point-of-Sale Equipment
PC-to-Router Connections
Diagnostic Ports
Telecom Equipment
Benefits and Features
•Isolation Breaks Ground Loops Due to High Common-
Mode Voltages While Maintaining Data Rate
•±50V Isolation
•250kbps Guaranteed Data Rate
•FAULT Output Signals Excessive Isolated-Side
Voltage
•Integration of Isolation and RS-232 Saves Space
•SSOP Package
•Shutdown Allows Multiple Interfaces (IrDA, RS-232,
RS-485) to be Connected to the Same UART
•High-Impedance Transmitter and Receiver
Outputs in Shutdown
•20µA Supply Current in Shutdown
• Inductorless/Transformerless Design Simplifies EMI
Compliance
• Low-Cost Replacement for Opto-Isolated
Transceivers
• Meets EIA/TIA-232 Specifications Down to 3.0V
19-2443; Rev 4; 2/15
Typical Operating Circuit appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX3250CAI+ 0°C to +70°C 28 SSOP
MAX3250EAI+ -40°C to +85°C 28 SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VCC
C2-
GND
FAULT
SHDN
N.C.
ISOCOM
N.C.
C2+
ISOVCC
R1IN
R2IN
T1OUT
T2OUT
V-
C4-
C4+
C3-
V+
C3+
C1+
N.C.
N.C.
T2IN
T1IN
R2OUT
R1OUT
C1-
SSOP
TOP VIEW
MAX3250
+
Pin Configuration
+
Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information
MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Maxim Integrated | 2www.maximintegrated.com
Absolute Maximum Ratings
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.
(All voltages referenced to GND, unless otherwise noted.)
VCC ...........................................................................-0.3V to +6V
ISOCOM...............................................................................±80V
ISOVCC to ISOCOM.................................................-0.3V to +6V
V+ to ISOCOM (Note 1)............................................-0.3V to +7V
V- to ISOCOM (Note 1)............................................+0.3V to -7V
V+ + |V-| (Note 1) ...................................................................13V
Input Voltages
T_IN, SHDN ...........................................................-0.3V to +6V
R_IN to ISOCOM...............................................................±25V
Output Voltages
T_OUT to ISOCOM ........................................................±13.2V
R_OUT.....................................................-0.3V to (VCC + 0.3V)
FAULT....................................................................-0.3V to +6V
C1-, C2-......................................................-0.3V to (VCC + 0.3V)
C1+, C2+, C3+, C3-, C4+, C4-
to ISOCOM .....................................-0.3V to (ISOVCC + 0.3V)
T_OUT Current ..............30mA (continuous), 50mA (peak, 10µs)
R_IN Current..................30mA (continuous), 50mA (peak, 10µs)
ISOCOM Current ...........30mA (continuous), 50mA (peak, 10µs)
Short-Circuit Duration T_OUT to ISOCOM .................Continuous
Continuous Power Dissipation (TA= +70°C)
28-Pin SSOP (derate 15mW/°C above +70°C) .......1201.2mW
Operating Temperature Ranges
MAX3250CAI .....................................................0°C to +70°C
MAX3250EAI...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Electrical Characteristics
(VCC = 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND, TA= TMIN to TMAX, unless oth-
erwise noted. Typical values are at VCC = 3.3V and TA= +25°C.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
Supply Current SHDN = VCC, no load 15 35 mA
SHDN = GND, VISOCOM = GND 20 45
Supply Current Shutdown SHDN = GND, VISOCOM = ±50V ±350 µA
Maximum Ground Differential |VGND - VISOCOM|50 V
Isolation Resistance Between GND and ISOCOM 60 kΩ
LOGIC INPUTS
Input Logic Low T_IN, SHDN 0.8 V
VCC = 3.3V 2.0
Input Logic High T_IN, SHDN
VCC = 5.0V 2.4 V
Transmitter Input Hysteresis 0.5 V
Input Leakage Current T_IN, SHDN -1 ±0.01 +1 µA
RECEIVER OUTPUTS
Output Leakage Current SHDN = GND -10 ±0.05 +10 µA
Output-Voltage Low IOUT = 1.6mA 0.4 V
Output-Voltage High IOUT = -1.0mA VCC - 0.6 VCC - 0.1 V
FAULT OUTPUT
Output-Voltage Low
(Open Drain) IOUT = 5mA 0.4 V
Output Leakage Current FAULT not asserted 1 µA
FAULT Trip Level |VGND - VISOCOM|55 V
Note 1: V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Maxim Integrated | 3www.maximintegrated.com
Electrical Characteristics (continued)
(VCC = 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND, TA= TMIN to TMAX, unless oth-
erwise noted. Typical values are at VCC = 3.3V and TA= +25°C.) (Note 2)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
RECEIVER INPUTS (relative to ISOCOM)
Input-Voltage Range -25
+25
V
VCC = 3.3V 1.2 0.6
Input Threshold Low TA = +25°C VCC = 5.0V 1.3 0.8 V
VCC = 3.3V 2.4 1.6
Input Threshold High TA = +25°C VCC = 5.0V 2.4 1.7 V
Input Hysteresis 0.5 V
Input Resistance TA = +25°C 3 5 7 kΩ
TRANSMITTER OUTPUTS (relative to ISOCOM)
Output-Voltage Swing All transmitter outputs loaded with 3kΩ to ISOCOM,
TA = +25°C
±5.0 ±5.4
V
Output Resistance ISOVCC = V+ = V- = 0V, VT_OUT = ±2V
300 10M
Ω
Output Short-Circuit Current -60
+60
mA
Output Leakage Current VCC = 0 or 3V to 5.5V, VT_OUT = ±12V, SHDN = GND -25
+25
µA
Timing Characteristics
(VCC = 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND, TA= TMIN to TMAX, unless oth-
erwise noted. Typical values are at VCC = 3.3V and TA= +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Data Rate RL = 3kΩ, CL = 1000pF to ISOCOM, one transmitter,
TA = +25°C 250 kbps
Receiver Propagation Delay R_IN to R_OUT, CL = 150pF to GND 0.4 µs
Receiver Skew |tPHL - tPLH|100 ns
Transmitter Skew |tPHL - tPLH| (Note 3) 120 ns
CL = 150pF to 1000pF
to ISOCOM 630
Transition-Region Slew Rate
VCC = 3.3V, TA = +25°C,
RL = 3kΩ to 7kΩ to ISOCOM,
measured from +3V to -3V or
-3V to +3V CL = 150pF to 2500pF
to ISOCOM 430
V/µs
FAULT Propagation Delay 0.3 µs
Time to Shutdown 0.5 µs
VISOCOM = GND 300
Time to Exit Shutdown VISOCOM = ±50V 350 µs
Note 2: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground, unless otherwise noted.
Note 3: Transmitter skew is measured at the transmitter zero crosspoints.
Typical Operating Characteristics
(VCC = 3.3V, 250kbps data rate, see Typical Operating Circuit and Table 1 for capacitor values, all transmitters loaded with 3kΩand
CLto ISOCOM, TA= +25°C, unless otherwise noted.)
Maxim Integrated | 4www.maximintegrated.com
MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
MAX3250 toc05
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
603510-15
-200
-100
0
100
200
300
400
-300
-40 85
SHUTDOWN CURRENT
vs. TEMPERATURE
ISOCOM = -50V
ISOCOM = 0V
ISOCOM = +50V
TIME TO EXIT SHUTDOWN
VISOCOM = 0V
TOUT
5V/div
MAX3250 toc04
100μs/div
SHDN
5V/div
MAX3250 toc03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
4000300020001000
10
20
30
40
50
60
70
80
90
0
0 5000
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 20kbps
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
250kbps
120kbps
20kbps
MAX3250 toc02
LOAD CAPACITANCE (pF)
SLEW RATE (V/μs)
4000300020001000
5
10
15
20
25
30
0
05000
SLEW RATE
vs. LOAD CAPACITANCE
-SLEW
+SLEW
FOR DATA RATES UP TO 250kbps
MAX3250 toc01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
4000300020001000
-4
-2
0
2
4
6
8
-6
0 5000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
VOUT+
VOUT-
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 20kbps
COMMON-MODE FAULT RESPONSE
ISOCOM
50V/div
MAX3250 toc07
FAULT
5V/div
4ms/div
MAX3250 toc01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
4000300020001000
-4
-2
0
2
4
6
8
-6
0 5000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
VOUT+
VOUT-
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 20kbps
Pin Description
PIN NAME FUNCTION
1 C1- Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1- to C1+.
See Table 1 for values.
2 R1OUT TTL/CMOS Receiver Output
3 R2OUT TTL/CMOS Receiver Output
4 T1IN TTL/CMOS Transmitter Input
5 T2IN TTL/CMOS Transmitter Input
6, 22, 23 N.C. No Connection. Not internally connected.
7 N.C. No Connection. Leave unconnected or connect to ISOCOM.
8 C1+ Positive Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1+ to C1-.
See Table 1 for values.
9 C3+ Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from
C3+ to C3-.
10 V+ +5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V+ to ISOCOM with a
0.47µF capacitor.
11 C3- Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from
C3- to C3+.
12 C4+ Positive Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from
C4+ to C4-.
13 C4- Negative Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from
C4- to C4+.
14 V- -5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V- to ISOCOM with a 0.47µF
capacitor.
15 ISOCOM Isolated Ground
16 T2OUT RS-232 Transmitter Output
17 T1OUT RS-232 Transmitter Output
18 R2IN RS-232 Receiver Input
19 R1IN RS-232 Receiver Input
20 ISOVCC Internally Generated Isolated Power-Supply Voltage, Referenced to ISOCOM. Bypass ISOVCC to
ISOCOM with a 2.2µF capacitor.
21 C2+ Positive Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C2+ to C2-.
See Table 1 for values.
24 SHDN Shutdown Control. Drive SHDN low to enter low-power shutdown mode. Drive SHDN high or connect
to VCC for normal operation.
25 FAULT Overvoltage Indicator. Active low, open drain.
26 GND Ground
27 C2- Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C2- to C2+.
See Table 1 for values.
28 VCC 3.0V to 5.5V Supply Voltage. Bypass VCC to GND with a 1µF capacitor.
MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Maxim Integrated | 5www.maximintegrated.com
MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Maxim Integrated | 6www.maximintegrated.com
Detailed Description
The MAX3250 is a 3.0V to 5.5V powered, ±50V isolated
EIA/TIA-232 and V.28/V.24 communications interface
with high data-rate capabilities. The MAX3250 is a dual
die part that operates with up to ±50V difference
between the RS-232 side and the logic side (ISOCOM
to GND). This makes the device ideal for operation in
noisy conditions with high common-mode voltages.
This feature prevents damage to the device if RS-232
lines are inadvertently short-circuited to a +24V or ±48V
power bus.
The MAX3250 typically draws 15mA of supply current
when unloaded. Supply current drops to 20µA when
the device is placed in shutdown mode.
The MAX3250 has two receivers and two drivers and is
guaranteed to operate at data rates up to 250kbps. The
device features a FAULT open-drain output to signal an
excessive isolated-side voltage condition on any of the
RS-232 inputs. This output can drive an alarm LED or can
be monitored by the processor to prevent operation
under these conditions. The receiver outputs are high
impedance in shutdown, allowing multiple interfaces
(IrDA, RS-232, RS-485) to be connected to the same
UART (Figure 1). The MAX3250 is a low-cost replacement
for opto-isolated transceivers.
Isolated Power Supply
The MAX3250 drives a high-frequency square wave into
C1 and a complementary square wave into C2. These
POWER
CONTROLLER
FAULT
SHDN
GND C1- C2- C1+ C2+ ISOCOM
TOUT2
RIN2
ISOVCC
C3+
C3-
C4+
C4-
V+
V-
TIN1
ROUT1
ROUT2
TIN2
TOUT1
RIN1
RS-232
CHARGE
PUMP
VCC
MAX3250
FAULT
DETECTOR
OSC
Figure 1. Functional Diagram
MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Maxim Integrated | 7www.maximintegrated.com
AC waveforms are rectified on the isolated side of the
dual die to power its internal circuitry (ISOVCC).
Capacitor C6 filters the output of the rectifier. See the
Typical Operating Circuit
.
The power controller works in a dual power mode. Power
is maximum when the isolated power supply is below its
regulation point. Power is reduced when the isolated
power supply is above its regulation point.
Dual Charge-Pump Voltage Converter
The RS-232 drivers are powered from a regulated dual
charge pump that provides output voltages of +5.5V (dou-
bling charge pump) and -5.5V (inverting charge pump)
relative to ISOCOM over the 3.0V to 5.5V VCC range.
The charge pumps are powered from ISOVCC and
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 flying
capacitor (C3, C4) and a reservoir capacitor (C7, C8)
to generate the V+ and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that convert
TTL/CMOS-logic levels to ±5.0V EIA/TIA-232-compliant
levels. They guarantee a 250kbps data rate with worst-
case loads of 3kΩin parallel with 1000pF to ISOCOM. In
shutdown, the transmitters are disabled and the outputs
are forced into a high-impedance state. When powered
off or shut down, the outputs can be driven up to ±12V
relative to ISOCOM. The transmitter inputs do not have
pullup resistors. All unused inputs should be connected
to VCC or GND.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The receivers’ outputs are forced into a
high-impedance state when the device is in shutdown.
This allows a single UART to multiplex between differ-
ent protocols.
Low-Power Shutdown Mode
Shutdown mode is obtained by driving SHDN low. In
shutdown, the devices typically draw only 20µA of sup-
ply current and no power is transferred across the iso-
lation capacitors. The charge pumps are disabled, and
the receiver outputs and transmitter outputs are high
impedance. When exiting shutdown the charge pumps
and transmitter outputs are fully operational in typically
500µs (Figure 3). Connect SHDN to VCC if the shut-
down mode is not used.
Applications Information
Power Isolation Capacitors
The values for capacitors C1 and C2 are important for
proper operation of the device. These capacitors
should be 0.047µF for 4.5V to 5.5V operation, and
0.47µF for 3.0V to 3.6V operation. Smaller values result
in insufficient supply voltage on the isolated side.
Larger values are not allowed.
Capacitor C9 provides an AC feedback path for proper
controller operation. Connect C9 from ISOCOM to GND.
The values for C1, C2, and C9 determine the maximum
frequency and amplitude of the voltage difference
between the local and isolated ground. Table 1 shows
proper capacitance values.
LOAD CURRENT PER TRANSMITTER (mA)
TRANSMITTER OUTPUT VOLTAGE (V)
764 52 31
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
-6
08
VCC = 3.0V VOUT+
VOUT-
T1
T2
VCC
VOUT1+
VOUT2-
Figure 2. Transmitter Output Voltage vs. Load Current per
Transmitter
100µs/div
2V/div
T2OUT
VCC = 3.3V
SHDN
5V/div
T1OUT
Figure 3. Transmitter Outputs when Exiting Shutdown or
Powering Up
MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Maxim Integrated | 8www.maximintegrated.com
To achieve full isolation capability, C1, C2, and C9
should be rated for 100V or higher operation and be X7R
or X5R type or metalized film dielectric. Y5V and Z5U
dielectrics should be avoided as their voltage and tem-
perature coefficients make their power-transfer capabili-
ties insufficient.
Charge-Pump and Bypass Capacitors
Capacitors C3–C8 should be X7R or X5R type dielec-
tric. Their voltage rating needs to be 10V or higher.
Layout Information
Because the MAX3250 is intended for systems requir-
ing ±50V isolation, some consideration in component
placement is necessary.
A 20mil air gap should isolate the logic side and the
isolated RS-232 side, across the N.C. pins (pin num-
bers 6, 7, 22, and 23) of the MAX3250. The only com-
ponents that cross this air gap should be C1, C2, and
C9, which should all have a minimum 100V rating.
All capacitors should be located as close to the
MAX3250 as possible.
Maximum Voltage Between
ISOCOM and Logic GND
High values of applied isolation voltage and frequency
can cause ripple on ISOVCC, V+, V-, and in extreme
cases on VCC. Therefore, it is recommended that the
isolation-voltage and frequency be limited to the values
shown in the
Typical Operating Characteristics
.
Insert a 1kΩ1/4W resistor in series with any isolation
test voltage when testing for maximum values of
applied isolation voltage. Exceeding the maximum lim-
its of voltage and frequency (see the
Typical Operating
Characteristics
) could trigger a holding current in the
internal ESD-protection device if the ±80V isolation limit
is exceeded. This resistor should not be used in normal
application.
Transmitter Outputs when
Exiting Shutdown
Figure 3 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 (one transmitter input is high, the other is low). Each
transmitter is loaded with 3kΩin parallel with 2500pF.
The transmitter outputs display no ringing or undesir-
able transients as they come out of shutdown. Note that
the transmitters are enabled only when the magnitude
of V- exceeds approximately -3V.
VCC (V) C1, C2 (µF) C3 (µF) C4, C7, C8 (µF) C5 (µF) C6 (µF) C9 (nF)
3.0 to 3.6 0.47 0.1 0.47 12.2 10
4.5 to 5.5 0.047 0.1 0.47 12.2 10
Table 1. Required Capacitor Values
MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Maxim Integrated | 9www.maximintegrated.com
Chip Information
PROCESS: BiCMOS
RIN1
TOUT1
GND
VCC
ISOCOM
V-
ISOVCC
V+
RIN2
TOUT2
TIN1
ROUT1
TIN2
ROUT2
C1-
C1+
C2-
C2+
C4+
C4-
C3+
C3-
CABLE
VCC
C5
1µF
C1
0.47µF
GND
OFFSET
REMOTE
GROUND
MAX3250
FAULT
SHDN
MICRO
C2
0.47µF
C9
10nF
±50V
C6
2.2µF
C8
0.47µF
C7
0.47µF
C4
0.47µF
C3
0.1µF
REMOTE MICRO
REMOTE
XCVR
Typical Operating Circuit
Package Information
For the latest package outline information and land patterns (foot-
prints), 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
TYPE
PACKAGE
CODE OUTLINE NO. LAND
PATTERN NO.
28 SSOP A28M+3 21-0056 90-0095
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. © 2015 Maxim Integrated Products, Inc. | 10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
MAX3250 ±50V Isolated, 3.0V to 5.5V, 250kbps,
2 Tx/2 Rx, RS-232 Transceiver
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 4/02 Initial release —
1 2/03 Updated Design —
2 1/08 Updated EC table 3
3 9/11
Added lead-free packaging information; corrected pin names, power
dissipation, and soldering temperature in Absolute Maximum Ratings;
updated capacitor values in data sheet.
1, 2, 3, 5–9
4 2/15 Updated Benefits and Features section 1
