1 Features

1• RS-232 Bus-Pin ESD Protection Exceeds ±15 kV

Using Human-Body Model (HBM)

• Meets or Exceeds the Requirements of

TIA/EIA-232-F and ITU v.28 Standards

• Operates With 3-V to 5.5-V VCC Supply

• Operates Up to 250 kbps

• Two Drivers and Two Receivers

• Low Standby Current: 1 μA Typical

• External Capacitors: 4 × 0.1 μF

• Accepts 5-V Logic Input With 3.3-V Supply

• Alternative High-Speed Pin-Compatible Device

(1 Mbps)

– SNx5C3222

2 Applications

• Battery-Powered Systems

• PDAs

• Notebooks

• Laptops

• Palmtop PCs

• Hand-held Equipment

3 Description

The MAX3222 consists of two line drivers, two line

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

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 3-V to 5.5-V supply. The device operates at

data signaling rates up to 250 kbit/s and a maximum

of 30-V/μs driver output slew rate.

The MAX3222 can be placed in the power-down

mode by setting PWRDOWN low, which draws only 1

μA from the power supply. When the device is

powered down, the receivers remain active while the

drivers are placed in the high-impedance state.

Receiver outputs also can be placed in the highimpedance

state by setting EN high.