For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

________________General Description

The MAX3224–MAX3227/MAX3244/MAX3245 are 3V-

powered EIA/TIA-232 and V.28/V.24 communications

interfaces with automatic shutdown/wakeup features

and high data-rate capabilities.

All devices achieve a 1µA supply current using Maxim’s

revolutionary AutoShutdown Plus™ feature. These

devices automatically enter a low-power shutdown

mode when the RS-232 cable is disconnected or the

transmitters of the connected peripherals are inactive,

and the UART driving the transmitter inputs is inactive

for more than 30 seconds. They turn on again when

they sense a valid transition at any transmitter or receiv-

er input. AutoShutdown Plus saves power without

changes to the existing BIOS or operating system.

The MAX3225/MAX3227/MAX3245 also feature

MegaBaud™ operation, guaranteeing 1Mbps for high-

speed applications such as communicating with ISDN

modems. The MAX3224/MAX3226/MAX3244 guarantee

250kbps operation. The transceivers have a proprietary

low-dropout transmitter output stage enabling true RS-

232 performance from a +3.0V to +5.5V supply with a

dual charge pump. The charge pump requires only four

small 0.1µF capacitors for operation from a 3.3V supply.

The MAX3224–MAX3227 feature a logic-level output

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

ing and the device is ready to begin transmitting.

All devices are available in a space-saving SSOP pack-

age.

________________________Applications

Notebook, Subnotebook, and Palmtop Computers

Cellular Phones

Battery-Powered Equipment

Hand-Held Equipment

Peripherals

Printers

____________________________Features

o 1µA Supply Current

o AutoShutdown Plus—EDN Innovation of the Year

o Guaranteed Data Rate:

250kbps (MAX3224/3226/3244)

1Mbps (MAX3225/3227/3245)

o Guaranteed Slew Rate:

6V/µs (MAX3224/3226/3244)

24V/µs (MAX3225/3227/3245)

o Meets EIA/TIA-232 Specifications Down to 3.0V

o Guaranteed Mouse Driveability (MAX3244/3245)

o Ready-to-Transmit Logic-Level Output

1µA Supply Current, 1Mbps, 3.0V to 5.5V,

RS-232 Transceivers with AutoShutdown Plus

________________________________________________________________

Maxim Integrated Products

1

19-1289; Rev 1; 3/98

PART

MAX3224

MAX3225

MAX3226

1/1

2/2

2/2

NO. OF

DRIVERS/

RECEIVERS

READY

OUTPUT

AUTO-

SHUTDOWN

PLUS

250k

1M

250k

GUARANTEED

DATA RATE

(bps)

MAX3227

MAX3244

MAX3245

3/5

3/5

1/1

—

—

1M

250k

1M

PART

MAX3224CPP

MAX3224CAP

MAX3224EPP

-40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

20 Plastic DIP

20 SSOP

20 Plastic DIP

MAX3224EAP

MAX3225CPP

MAX3225CAP

0°C to +70°C

0°C to +70°C

-40°C to +85°C

20 SSOP

20 Plastic DIP

20 SSOP

MAX3225EPP

-40°C to +85°C

20 Plastic DIP

MAX3225EAP

-40°C to +85°C

20 SSOP

Ordering Information continued at end of data sheet.

AutoShutdownPlus and MegaBaud are trademarks of Maxim Integrated Products.

†

Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other patents pending.

_____________________ Selector Guide

_______________Ordering Information