_______________General Description

The MAX3316E–MAX3319E are 2.5V powered RS-232

compatible transceivers. These devices feature shut-

down (MAX3317E), AutoShutdown Plus™ (MAX3318E/

MAX3319E), and enhanced electrostatic discharge

(ESD) protection integrated into the chip. All transmitter

outputs and receiver inputs are protected to ±15kV

using the IEC 1000-4-2 Air-Gap Discharge method,

±8kV using the IEC 1000-4-2 Contact Discharge

method, and ±15kV using the Human Body Model.

All devices are guaranteed at a data rate of 460kbps.

The transceivers have a proprietary low-dropout trans-

mitter output stage enabling RS-232 compatible opera-

tion from a +2.25V to +3.0V supply with a dual charge

pump. The charge pump requires only four 0.1µF

capacitors. The MAX3318E/MAX3319E feature a logic-

level output (READY) that asserts when the charge

pump is regulating and the device is ready to begin

transmitting.

The MAX3318E/MAX3319E achieve a 1µA supply current

using Maxim’s revolutionary AutoShutdown Plus feature.

These devices automatically enter a low-power shut-

down mode when the RS-232 cable is disconnected or

the transmitters of the connected peripherals are inactive

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

MAX3317E also features a 1µA shutdown mode that

can be entered by driving SHDN low. The MAX3317E’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:

MAX3316E (16-pin SSOP and 20-pin TSSOP), MAX3317E/

MAX3318E (20-pin SSOP and 20-pin TSSOP), and

MAX3319E (16-pin SSOP).

________________________Applications

Palmtop Computers

Hand-Held Instruments

Pagers

Cellular Phones

GPS

Handy Terminals

Hand-Held Electronic Books

____________________________Features

o ESD Protection for RS-232 I/O Pins

±15kV—Human Body Model

±8kV—IEC 1000-4-2, Contact Discharge

±15kV—IEC 1000-4-2, Air-Gap Discharge

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

±15kV ESD-Protected, 2.5V, 1µA, 460kbps,

RS-232 Compatible Transceivers

________________________________________________________________ Maxim Integrated Products

1

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

FORCEOFF

GND

T1OUT

C1-

V+

C1+

READY

R1IN

R1OUT

FORCEON

T1IN

T2OUT

V-

C2-

C2+

12

11

9

10

T2IN

INVALID

R2OUT

R2IN

MAX3318E

SSOP/TSSOP

Pin Configurations

19-1616; Rev 0; 1/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Ordering Information

Selector Guide and Typical Application Circuits appear at

end of data sheet.

AutoShutdown Plus is a trademark of Maxim Integrated Products.

PART

MAX3316ECUP

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

20 TSSOP

MAX3316ECAE

0°C to +70°C

16 SSOP

MAX3316EEUP

-40°C to +85°C

20 TSSOP

MAX3316EEAE

-40°C to +85°C

16 SSOP

MAX3317ECUP

0°C to +70°C

20 TSSOP

MAX3317ECAP

0°C to +70°C

20 SSOP

MAX3317EEUP

-40°C to +85°C

20 TSSOP

MAX3317EEAP

-40°C to +85°C

20 SSOP

MAX3318ECUP

0°C to +70°C

20 TSSOP

MAX3318ECAP

0°C to +70°C

20 SSOP

MAX3318EEUP

-40°C to +85°C

20 TSSOP

MAX3318EEAP

-40°C to +85°C

20 SSOP

MAX3319ECAE

0°C to +70°C

16 SSOP

MAX3319EEAE

-40°C to +85°C

16 SSOP

Pin Configurations continued at end of data sheet.