AutoShutdownPlus, MegaBaud, and UCSP are trademarks

of Maxim Integrated Products, Inc.

19-1289; Rev 4; 10/08

________________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 TQFN,

TSSOP, and SSOP packages.

________________________Applications

Notebook, Subnotebook, and Palmtop Computers

Cellular Phones

Battery-Powered Equipment

Handheld Equipment

Peripherals

Printers

_Next Generation Device Features

♦♦ For Smaller Packaging:

MAX3228/MAX3229: +2.5V to +5.5V RS-232

Transceivers in UCSP™

♦♦ For Low-Voltage or Data Cable Applications:

MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,

2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-

Protected I/O and Logic Pins

♦♦ For Integrated ESD Protection:

MAX3246E: ±15kV ESD-Protected, Down to 10nA,

+3.0V to +5.5V, Up to 1Mbps, True RS-232

Transceivers (MAX3246E Available in UCSP)

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

RS-232 Transceivers with AutoShutdown Plus

________________________________________________________________

Maxim Integrated Products

1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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

Ordering Information continued at end of data sheet.

_____________________ Selector Guide

_______________Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX3224CPP

0

°C to +70°C

20 Plastic DIP

MAX3224CAP

0

°C to +70°C

20 SSOP

MAX3224CTP

0

°C to +70°C

20 Thin QFN-EP*

MAX3224CUP

0

°C to +70°C

20 TSSOP

MAX3224EPP

-40

°C to +85°C

20 Plastic DIP

MAX3224EAP

-40

°C to +85°C

20 SSOP

MAX3224ETP

-40

°C to +85°C

20 Thin QFN-EP*

5mm x 5mm

MAX3224EUP

-40

°C to +85°C

20 TSSOP

*

EP = Exposed paddle.