MAX3233E-MAX3235E MAXIM [Maxim Integrated Products], MAX3233E-MAX3235E Datasheet

MAX3233E-MAX3235E

Manufacturer Part Number

MAX3233E-MAX3235E

Description

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX3233E-MAX3235E.pdf (12 pages)

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The MAX3233E/MAX3235E are EIA/TIA-232 and V.28/V.24

communications interfaces with automatic shutdown/

wake-up features, high data-rate capabilities, and

enhanced electrostatic discharge (ESD) protection. All

transmitter outputs and receiver inputs are protected to

±15kV using IEC 1000-4-2 Air-Gap Discharge, to ±8kV

using IEC 1000-4-2 Contact Discharge, and to ±15kV

using the Human Body Model. The MAX3233E operates

from a +3.3V supply; the MAX3235E operates from +5.0V.

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 following two conditions occur: either

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 receiver input.

AutoShutdown Plus saves power without changes to

the existing BIOS or operating system.

The MAX3233E/MAX3235E have internal dual charge

pumps requiring no external capacitors. Both trans-

ceivers have a proprietary low-dropout transmitter out-

put stage that enables true RS-232 performance from a

+3.0V to +3.6V supply for the MAX3233E or a +4.5V to

+5.5V supply for the MAX3235E. These devices are

guaranteed to operate up to 250kbps. Both are avail-

able in space-saving 20-pin wide SO or plastic DIP

packages.

AutoShutdown Plus is a trademark of Maxim Integrated Products.

________________________Applications

_______________Ordering Information

19-1473; Rev 0; 4/99

________________General Description

Ordering Information continued at end of data sheet.

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

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

±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual

†

4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other

patents pending.

MAX3233ECWP

MAX3233ECPP

MAX3233EEWP

MAX3233EEPP

Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577;

RS-232 Transceivers with Internal Capacitors

Subnotebook and Palmtop Computers

Cellular Phones

Battery-Powered Equipment

Hand-Held Equipment

Peripherals

Embedded Systems

PART

________________________________________________________________ Maxim Integrated Products

-40°C to +85°C

TEMP. RANGE

0°C to +70°C

PIN-PACKAGE

20 SO

20 Plastic DIP

20 SO

20 Plastic DIP

____________________________Features

Typical Operating Circuit appears at end of data sheet.

ESD Protection for RS-232 I/O Pins

Latchup Free

1µA Supply Current

AutoShutdown Plus—1997 EDN Magazine

Innovation of the Year

Single-Supply Operation

250kbps Guaranteed Data Rate

6V/µs Guaranteed Slew Rate

Meets EIA/TIA-232 Specifications Down to 3.0V

(MAX3233E)

Internal Charge-Pump Capacitors

FORCEOFF

FORCEON

INVALID

±15kV—Human Body Model

±8kV—IEC 1000-4-2, Contact Discharge

±15kV—IEC 1000-4-2, Air-Gap Discharge

+3.0V to +3.6V (MAX3233E)

+4.5V to +5.5V (MAX3235E)

R2OUT

R1OUT

T1OUT

R1IN

T2IN

T1IN

Functional Diagram

SO/DIP

Pin Configuration/

CHARGE

PUMP

MAX3233E

MAX3235E

R2IN

T2OUT

GND

V-

C2-

C2+

C1-

C1+

V+

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