General Description

The MAX3316–MAX3319 transceivers have a proprietary

low-dropout transmitter output stage enabling RS-232-

compatible performance from +2.25V to +3.0V with a

dual-charge pump. These devices require only four

0.1µF capacitors, and are guaranteed to operate at data

rates up to 460kbps.

The MAX3318/MAX3319 achieve a 1µA supply current

using Maxim’s revolutionary AutoShutdown Plus™ fea-

ture. These devices automatically enter a low-power

shutdown mode when the RS-232 cable is disconnected

or the transmitters of the connected peripherals are inac-

tive for more than 30 seconds. They turn on again when

they sense a valid transition at any transmitter or receiver

input. AutoShutdown Plus saves power without changes

to the existing BIOS or operating system. The MAX3318

is a 2-Tx/2-Rx device while the MAX3319 is a 1-Tx/1-Rx

device. These devices also feature a logic-level output

(READY) that asserts when the charge pump is regulat-

ing and the device is ready to begin transmitting.

The MAX3316/MAX3317 are 2-Tx/2-Rx transceivers. The

MAX3317 features a 1µA shutdown mode that can be

entered by driving SHDN low. The MAX3317’s receivers

remain active while in shutdown mode, allowing external

devices such as modems to be monitored using only

1µA supply current.

These devices are available in space-saving packages:

MAX3316 (16-pin SSOP and 20-pin TSSOP), MAX3317/

MAX3318 (20-pin SSOP and 20-pin TSSOP), and

MAX3319 (16-pin SSOP).

________________________Applications

Palmtop Computers

Hand-Held Instruments

Pagers

Cellular Phones

GPS

Handy Terminals

Hand-Held Electronic Books

Features

o AutoShutdown Plus (MAX3318/MAX3319)

o 300µA Operating Supply Current

o 1µA Low-Power Shutdown with Receivers Active

o Guaranteed 460kbps Data Rate

o Guaranteed 4V/µs Slew Rate

o RS-232 Compatible Down to 2.25V

2.5V, 1µA, 460kbps,

RS-232-Compatible Transceivers

________________________________________________________________ Maxim Integrated Products

1

MAX3319

FORCEON

READY

AutoShutdown

Plus

12

1

R1OUT

9

FORCEOFF 16

INVALID

10

GND

14

T1IN

11

C2-

6

C2+

5

C1-

4

C1+

2

R1IN 8

T1OUT 13

V-

7

V+

3

C4

0.1

µF

C3

0.1

µF

0.1

µF

15

C1

0.1

µF

C2

0.1

µF

+2.5V

TO POWER-

MANAGEMENT

UNIT

5k

CMOS

INPUT

RS-232-

COMPATIBLE

OUTPUT

RS-232-

COMPATIBLE

INPUT

CMOS

OUTPUT

Typical Application Circuits

19-1751; Rev 0; 6/00

Ordering Information

AutoShutdown Plus is a trademark of Maxim Integrated Products.

Pin Configurations appear at end of data sheet.

Typical Application Circuits continued at end of data sheet.

PIN-PACKAGE

TEMP. RANGE

PART

MAX3316CUP

0°C to +70°C

20 TSSOP

16 SSOP

0°C to +70°C

MAX3316CAE

MAX3316EUP

-40°C to +85°C

20 TSSOP

16 SSOP

-40°C to +85°C

MAX3316EAE

PART

NO. OF DRIVERS/

RECEIVERS

GUARANTEED

DATA RATE (kbps)

READY OUTPUT

SHUTDOWN

—

—

460

460

—



—

—





460

460

2/2

2/2

2/2

1/1

MAX3316

MAX3317

MAX3318

MAX3319

AutoShutdown

Plus

—

—





Selector Guide

Ordering Information continued at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.