1 Features

• ESD Protection for RS-232 bus pins

– ±15kV Human-body model (HBM)

– ±8kV IEC61000-4-2, Contact discharge

– ±15kV IEC61000-4-2, Air-gap discharge

• Meets or exceeds the requirements of TIA/

EIA-232-F and ITU v.28 standards

• Operates with 3V to 5.5V VCC supply

• Operates up to 500kbit/s

• Two drivers and two receivers

• Low standby current: 1μA typical

• External capacitors: 4 × 0.1μF

• Accepts 5V logic input with 3.3V supply

• Alternative high-speed pin-compatible device

(1Mbit/s) for SNx5C3222E

2 Applications

• Industrial PCs

• Wired networking

• Data center and networking equipment

• Notebooks

• Hand-held equipment

3 Description

The MAX3222E consists of two line drivers, two line

receivers, and a dual charge-pump circuit with ±15kV

ESD protection pin to pin (serial-port connection pins,

including GND).

The device meets the requirements of TIA/EIA-232-

F and provides the electrical interface between

an asynchronous communication controller and the

serial-port connector. The charge pump and four small

external capacitors allow operation from a single 3V

to 5.5V supply. The device operates at typical data

signaling rates up to 500kbit/s and a maximum of

30V/μs driver output slew rate.

The MAX3222E can be placed in the power-down

mode by setting the power-down ( PWRDOWN) input

low, which draws only 1μA from the power supply.

When the device is powered down, the receivers

remain active while the drivers are placed in the

high-impedance state. Also, during power down, the

onboard charge pump is disabled; V+ is lowered to

VCC, and V– is raised toward GND. Receiver outputs

also can be placed in the high-impedance state by

setting enable ( EN) high.