MAX3233E View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX3233E

±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors

Maxim Integrated 

19-1473; Rev 0; 4/99

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

RS-232 Transceivers with Internal Capacitors

________________General Description

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.

________________________Applications

Subnotebook and Palmtop Computers

Cellular Phones

Battery-Powered Equipment

Hand-Held Equipment

Peripherals

Embedded Systems

_______________Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX3233ECWP

MAX3233ECPP

MAX3233EEWP

MAX3233EEPP

0°C to +70°C

0°C to +70°C

-40°C to +85°C

-40°C to +85°C

20 SO

20 Plastic DIP

20 SO

20 Plastic DIP

Ordering Information continued at end of data sheet.

AutoShutdown Plus is a trademark 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.

____________________________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 Latchup Free

o 1µA Supply Current

o AutoShutdown Plus—1997 EDN Magazine

Innovation of the Year

o Single-Supply Operation

+3.0V to +3.6V (MAX3233E)

+4.5V to +5.5V (MAX3235E)

o 250kbps Guaranteed Data Rate

o 6V/µs Guaranteed Slew Rate

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

(MAX3233E)

o Internal Charge-Pump Capacitors

Pin Configuration/

Functional Diagram

R2OUT 1

2

INVALID

3

T2IN

4

T1IN

5

FORCEON

6

R1OUT

7

T1OUT

R1IN 8

9

VCC

10

FORCEOFF

MAX3233E

MAX3235E

CHARGE

PUMP

SO/DIP

20 R2IN

19 T2OUT

18

GND

17 V-

16 C2-

15 C2+

14

C1-

13 C1+

12

V+

11

V+

Typical Operating Circuit appears at end of data sheet.

________________________________________________________________ Maxim Integrated Products 1

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.

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