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

GND

DOUT1

RIN1

ROUT1

FORCEON

DIN1

DIN2

INVALID

DB OR PW PACKAGE

(TOP VIEW)

TRS3318E

www.ti.com

SLLS805A – APRIL 2007 – REVISED APRIL 2010

2.5-V 460-kbps RS-232 TRANSCEIVER

WITH ±15-kV ESD PROTECTION

Check for Samples: TRS3318E

1

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 Mode (With

Receivers Active)

•

Designed to Transmit at a Data Rate of

460 kbps

•

Auto-Powerdown Plus Option Features

Flexible Power-Saving Mode

•

Supply

•

Designed to be Interchangeable With Industry

Standard '3318 Devices

APPLICATIONS

•

Battery-Powered Systems

•

PDAs

•

Cellular Phones

•

Notebooks

•

Hand-Held Equipment

•

Pagers

DESCRIPTION/ORDERING INFORMATION

The

TRS3318E

is

a

dual-driver,

dual-receiver,

RS-232-compatible

transceiver.

The

device

features

auto-powerdown 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 TRS3318E achieves a 1-µA supply current using the auto-powerdown 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-powerdown 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.

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 © 2007–2010, 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.