±15 kV ESD Protected, 3.3 V, RS-232
Line Driver/Receiver
ADM3232E
FEATURES
FUNCTIONAL BLOCK DIAGRAM
+3.3V INPUT
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
C2 +
0.1µF
10V
C2+ +6.6V TO –6.6V
VOLTAGE
C2–
INVERTER
+
V–
+
General-purpose RS-232 data link
Portable instruments
Handsets
Industrial/telecom diagnostic ports
C1+ +3.3V TO +6.6V VCC
VOLTAGE
C1–
V+
DOUBLER
C3
0.1µF
6.3V
C4
0.1µF
10V
T1IN
T1
T2
C5
0.1µF
T1OUT
T2IN
+
APPLICATIONS
ADM3232E
C1 +
0.1µF
10V
T2OUT
TTL/CMOS
INPUTS
RS-232
OUTPUTS
R1
R1OUT
TTL/CMOS
OUTPUTS
R1IN
5kΩ
R2
R2OUT
RS-232
INPUTS*
R2IN
5kΩ
*INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT.
06410-001
GND
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.
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.
All RS-232 (TxOUT and RxIN) inputs and outputs are protected
against electrostatic discharges (up to ±15 kV ESD protection).
This ensures compliance with IEC 1000-4-2 requirements.
The ADM3232E is available in a 16-lead narrow and wide SOIC
packages, as well as a space-saving 16-lead TSSOP.
Four external 0.1 μF charge pump capacitors are used for the
voltage doubler/inverter, permitting operation from a single
3.3 V supply.
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.
Rev. B
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