1 Features

• RS-232 bus-pin ESD protection exceeds ±15kv

using human-body model (HBM)

• Meets or exceeds the requirements of TIA/

EIA-232-F and ITU v.28 standards

• Operates at 5V V CC supply

• Four drivers and five receivers

• Operates up to 120kbit/s

• Low supply current in shutdown mode: 5μA typical

• External capacitors: 4 × 0.1μF

• Latch-up performance exceeds 100mA per JESD

78, class II

2 Applications

• Battery-powered systems

• PDAs

• Notebooks

• Laptops

• Palmtop PCs

• Hand-held equipment

3 Description

The MAX211 device consists of four line drivers,

five 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 5V

supply. The devices operate at data signaling rates up

to 120kbit/s and a maximum of 30V/μs driver output

slew rate.

The MAX211 has both shutdown (SHDN) and enable

control (EN). In shutdown mode, the charge pumps

are turned off, V+ is pulled down to VCC, V− is pulled

to GND, and the transmitter outputs are disabled. This

reduces supply current typically to 1μA. EN is used to

put the receiver outputs into the high-impedance state

to allow wired-OR connection of two RS-232 ports.

It has no effect on the RS-232 drivers or the charge

pumps.