1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

READY

C1+

V+

C1−

C2+

C2−

V−

DOUT2

RIN2

ROUT2

FORCEOFF

VCC

GND

DOUT1

RIN1

ROUT1

FORCEON

DIN1

DIN2

INVALID

DB OR PW PACKAGE

(TOP VIEW)

MAX3318

www.ti.com

SLLS687A – OCTOBER 2005 – REVISED OCTOBER 2013

2.5-V 460-kbps RS-232 TRANSCEIVER

WITH ±15-kV ESD PROTECTION

Check for Samples: MAX3318

1

FEATURES

DESCRIPTION

The MAX3318 is a dual-driver, dual-receiver, RS-232

•

ESD Protection for RS-232 I/O Pins

compatible transceiver. The device features auto-

–

±15 kV (Human-Body Model)

power-down

plus

and

enhanced

electrostatic

–

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

discharge (ESD) protection integrated into the chip.

Driver output and receiver input are protected to ±8

–

±8 kV (IEC 61000-4-2, Air-Gap Discharge)

kV using the IEC 61000-4-2 Air-Gap Discharge

•

300-

μA Operating Supply Current

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

•

1-

μA Low-Power Standby (With Receivers

Discharge method, and ±15 kV using the Human-

Active) Mode

Body Model (HBM).

•

Designed to Transmit at a Data Rate of

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

460 kbps

transceiver has a proprietary low-dropout driver

output stage enabling RS-232-compatible operation

•

Auto-Power-Down Plus Option Features

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

Flexible Power-Saving Mode

The

charge

pump

requires

only

four

0.1-

μF

•

Operates From a Single 2.25-V to 3-V VCC

capacitors and features a logic-level output (READY)

Supply

that asserts when the charge pump is regulating and

the device is ready to begin transmitting.

APPLICATIONS

The MAX3318 achieves a 1-

μA supply current using

•

Battery-Powered Systems

the

auto-power-down

feature.

This

device

•

PDAs

automatically enters a low-power power-down mode

when the RS-232 cable is disconnected or the drivers

•

Cellular Phones

of the connected peripherals are inactive for more

•

Notebooks

than 30 s. The device turns on again when it senses

•

Hand-Held Equipment

a valid transition at any driver or receiver input. Auto

power down saves power without changes to the

•

Pagers

existing BIOS or operating system.

This

device

is

available

in

two

space-saving

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

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.