MAX3238ECAIT Maxim Integrated Products, MAX3238ECAIT Datasheet

MAX3238ECAIT

Manufacturer Part Number

MAX3238ECAIT

Description

SSOP28

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX3238ECAIT.pdf (14 pages)

Specifications of MAX3238ECAIT

Date_code

05+

Current page: 1 of 14
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The MAX3238E/MAX3248E transceivers use Maxim’s

revolutionary AutoShutdown Plus™ feature to achieve

10nA supply current. These devices shut down the on-

board power supply and drivers when they do not sense

a valid signal transition on either the receiver or transmit-

ter inputs. This occurs if the RS-232 cable is disconnect-

ed or if the transmitters of the connected peripheral are

turned off. The devices turn on again when a valid transi-

tion is applied to any RS-232 receiver or transmitter input.

AutoShutdown Plus automatically achieves this power

savings through its on-board circuitry, as no changes are

required to the existing BIOS or operating system.

All RS-232 inputs and outputs, as well as the logic I/O

pins, have enhanced ESD protection to ±15kV. The addi-

tional ESD protection on the logic I/O pins makes the

MAX3238E/MAX3248E ideal for cell phone data cable

applications because it eliminates the need for costly

external TransZorb ™ or protection schemes.

The MAX3238E/MAX3248E contain five drivers and three

receivers and are 3V-powered EIA/TIA-232 and V.28/V.24

communication interfaces intended for cell phones, data

cables, and modem applications. A proprietary, high-effi-

ciency, dual charge-pump power supply and a low-

dropout transmitter combine to deliver true RS-232

performance from a single +3.0V to +5.5V supply. A

guaranteed data rate of 250kbps provides compatibility

with popular software for communicating with personal

computers.

The MAX3238E and the MAX3248E differ only in their

input logic thresholds. The MAX3238E has standard logic

thresholds, while the MAX3248E has low-level logic

thresholds of 0.6V to 1.2V, which are ideal for 1.8V sys-

tems.

The transmitter inputs, FORCEON, and FORCEOFF have

a 400kΩ active positive feedback resistor. Once driven to

a valid logic level, they will retain this level if the driving

signal is removed or goes high impedance. Unused

transmitter and logic inputs may be left unconnected. The

MAX3238E/MAX3248E can operate with supply voltages

ranging from +3.0V to +5.5V.

AutoShutdown Plus is a trademark of Maxim Integrated Products.

TransZorb is a trademark of General Semiconductor Industries, Inc.

†

4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other

patents pending.

19-1632; Rev 1; 6/01

Cellular Data Cables

Modems

Battery-Powered Equipment

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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

+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers

with ±15kV ESD-Protected I/O and Logic Pins

________________________________________________________________ Maxim Integrated Products

General Description

Peripherals

Data Cradles

Printers

Applications

o Enhanced ESD Protection on RS-232 I/O Pins and

o Guaranteed Data Rate: 250kbps

o 10nA Low-Power Shutdown with Receivers Active

o Schmitt Triggers on All Inputs

o Flow-Through Pinout

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

o Guaranteed 6V/µs Slew Rate

o Low-Level Logic Thresholds (MAX3248E)

o RS-232-Compatible Outputs to 2.7V

___________________Pin Configuration

Typical Operating Circuit appears at end of data sheet.

MAX3238ECAI

MAX3238EEAI

MAX3248ECAI

MAX3248EEAI

All Logic Pins

TOP VIEW

±15kV—Human Body Model

±8kV—IEC 1000-4-2 Contact Discharge

±15kV—IEC 1000-4-2 Air-Gap Discharge

PART

FORCEOFF

FORCEON

T1OUT

T2OUT

T3OUT

T4OUT

T5OUT

GND

R1IN

R2IN

R3IN

C2+

C2-

V-

TEMP. RANGE

-40°C to +85°C

0°C to +70°C

Ordering Information

MAX3238E

MAX3248E

SSOP

R3OUT

R1OUTB

INVALID

28 SSOP

C1+

V+

C1-

T1IN

T2IN

T3IN

R1OUT

R2OUT

T4IN

T5IN

PIN-PACKAGE

Features

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