±15 kV ESD Protected, 3.3 V, RS-232
Line Driver/Receiver
ADM3232E
Rev. B
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FEATURES
Data rate: 460 kbps
2 Tx and 2 Rx
Meets EIA-232E specifications
0.1 μF charge pump capacitors
ESD protection to IEC 1000-4-2 (801.2) on RS-232 I/Os
Contact discharge: ±8 kV
Air gap discharge: ±15 kV
APPLICATIONS
General-purpose RS-232 data link
Portable instruments
Handsets
Industrial/telecom diagnostic ports
FUNCTIONAL BLOCK DIAGRAM
C1+
C2+
C1–
C2–
V
CC
V–
V+
T1
IN
T1
OUT
T2
IN
T2
OUT
R1
OUT
R1
IN
R2
OUT
R2
IN
TTL/CMOS
INPUTS
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
RS-232
INPUTS*
T1
T2
R1
R2
+
+
+
C1
0.1µF
10V
C2
0.1µF
10V
GND
ADM3232E
C3
0.1µF
6.3V
+3.3V INPU
+3.3V TO +6.6V
VOLTAGE
DOUBLER
+6.6V TO –6.6V
VOLTAGE
INVERTER
C5
0.1µF
+
C4
0.1µF
10V
+
*INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT.
5kΩ
5kΩ
06410-001
Figure 1.
GENERAL DESCRIPTION
The ADM3232E transceiver is a high speed, 2-channel RS-232/V.28
interface device that operates from a single 3.3 V power supply.
Low power consumption makes it ideal for battery-powered
portable instruments. The ADM3232E conforms to the EIA-232E
and ITU-T V.28 specifications and operates at data rates up to
460 kbps.
All RS-232 (Tx
OUT
and Rx
IN
) inputs and outputs are protected
against electrostatic discharges (up to ±15 kV ESD protection).
This ensures compliance with IEC 1000-4-2 requirements.
This device is ideally suited for operation in electrically harsh
environments or where RS-232 cables are frequently plugged/
unplugged, with the ±15 kV ESD protection of the ADM3232E
RS-232 input/output pins.
Emissions are also controlled to within very strict limits. CMOS
technology is used to keep the power dissipation to an absolute
minimum, allowing maximum battery life in portable applications.
Four external 0.1 µF charge pump capacitors are used for the
voltage doubler/inverter, permitting operation from a single
3.3 V supply.
The ADM3232E is available in a 16-lead narrow and wide SOIC
packages, as well as a space-saving 16-lead TSSOP.
