FEATURES

? ESD Protection for RS-232 I/O Pins

– ±15 kV (Human-Body Model)

– ±8 kV (IEC 61000-4-2, Contact Discharge)

– ±15 kV (IEC 61000-4-2, Air-Gap Discharge)

? 300-μA Operating Supply Current

? 1-μA Low-Power Standby (With Receivers

Active) Mode

? Designed to Transmit at a Data Rate of

460 kbps

? Auto-Power-Down Plus Option Features

Flexible Power-Saving Mode

? Operates From a Single 2.25-V to 3-V V CC

Supply

APPLICATIONS

? Battery-Powered Systems

? PDAs

? Cellular Phones

? Notebooks

? Hand-Held Equipment

? Pagers

DESCRIPTION

The MAX3318E is a dual-driver, dual-receiver, RS-

232-compatible transceiver. The device features auto-power-down plus and enhanced electrostatic

discharge (ESD) protection integrated into the chip.

Driver output and receiver input are protected to ±15

kV using the IEC 61000-4-2 Air-Gap Discharge method, ±8 kV using the IEC 61000-4-2 Contact

Discharge method, and ±15 kV using the Human-

Body Model (HBM).

The device operates at a data rate of 460 kbps. The

transceiver has a proprietary low-dropout driver

output stage, enabling RS-232-compatible operation

from a 2.25-V to 3-V supply with a dual charge pump.

The charge pump requires only four 0.1-μF

capacitors and features a logic-level output (READY)

that asserts when the charge pump is regulating and

the device is ready to begin transmitting.

The MAX3318E achieves a 1-μA supply current using

the auto-power-down feature. This device

automatically enters a low-power power-down mode

when the RS-232 cable is disconnected or the drivers

of the connected peripherals are inactive for more than 30 s. The device turns on again when it senses

a valid transition at any driver or receiver input. Auto

power down saves power without changes to the

existing BIOS or operating system.

This device is available in two space-saving

packages: 20-pin SSOP and 20-pin TSSOP.