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MAX3238E

更新时间： 2024-11-04 22:58:03

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
14页	236K
描述
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers with 【15kV ESD-Protected I/O and Logic Pins

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MAX3238E 数据手册

19-1632; Rev 1; 6/01

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

with 15kV ESD-ꢀrotected I/O and Logic ꢀins

General Description

Features

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.

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

All Logic Pins

15kV—Human Body Model

8kV—IEC 1000-4-2 Contact Discharge

15kV—IEC 1000-4-2 Air-Gap Discharge

ꢀ Guaranteed Data Rate: 250kbps

ꢀ 10nA Low-Power Shutdown with Receivers Active

ꢀ Schmitt Triggers on All Inputs

ꢀ Flow-Through Pinout

ꢀ Meets EIA/TIA-232 Specifications Down to 3.0V

ꢀ Guaranteed 6V/µs Slew Rate

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

pins, have enhanced ESD protection to 1ꢀ5k. The addi-

tional ESD protection on the logic I/O pins ma5es the

MAX3238E/MAX3248E ideal for cell phone data cable

applications because it eliminates the need for costly

ꢀ Low-Level Logic Thresholds (MAX3248E)

ꢀ RS-232-Compatible Outputs to 2.7V

™

external TransZorb or protection schemes.

The MAX3238E/MAX3248E contain five drivers and three

receivers and are 3k-powered EIA/TIA-232 and k.28/k.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 +3.0k to +ꢀ.ꢀk supply. A

guaranteed data rate of 2ꢀ05bps provides compatibility

with popular software for communicating with personal

computers.

Ordering Information

PART

TEMP. RANGE

0°C to +70°C

-40°C to +8ꢀ°C

0°C to +70°C

-40°C to +8ꢀ°C

PIN-PACKAGE

MAX3238ECAI

MAX3238EEAI

MAX3248ECAI

MAX3248EEAI

28 SSOP

Typical Operating Circuit appears at end of data sheet.

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 0.6k to 1.2k, which are ideal for 1.8k sys-

tems.

The transmitter inputs, FORCEON, and FORCEOFF have

a 4005Ω active positive feedbac5 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 +3.0k to +ꢀ.ꢀk.

___________________ꢀin Configuration

TOP VIEW

C2+

GND

C2-

V-

C1+

V+

C1-

T1IN

T2IN

T3IN

T1OUT

T2OUT

MAX3238E

MAX3248E

T3OUT

R1IN

Applications

21 R1OUT

Cellular Data Cables

Modems

Battery-Powered Equipment

Peripherals

Data Cradles

Printers

R2IN

R2OUT

T4IN

18 R3OUT

T5IN

T4OUT

R3IN

T5OUT

FORCEON

FORCEOFF

AutoShutdown Plus is a trademark of Maxim Integrated Products.

16 R1OUTB

TransZorb is a trademark of General Semiconductor Industries, Inc.

†

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

INVALID

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

patents pending.

SSOP

________________________________________________________________ Maxim Integrated Products

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.

12 3 4 5 6 7...14

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与MAX3238E相关器件

型号	品牌	获取价格	描述	数据表
MAX3238EAI	MAXIM	获取价格	+3.0V to +5.5V, 1レA, up to 250kbps, True RS-2
MAX3238EAI+	MAXIM	获取价格	Line Transceiver, 3 Func, 5 Driver, 3 Rcvr, CMOS, PDSO28, SSOP-28
MAX3238EAI+T	MAXIM	获取价格	Line Transceiver, 3 Func, 5 Driver, 3 Rcvr, CMOS, PDSO28, SSOP-28
MAX3238EAIT	MAXIM	获取价格	LINE TRANSCEIVER, PDSO28, 0.200 INCH, 0.65 MM PITCH, SSOP-28
MAX3238EAI-T	MAXIM	获取价格	Line Transceiver, 3 Func, 5 Driver, 3 Rcvr, CMOS, PDSO28, SSOP-28
MAX3238ECAI	MAXIM	获取价格	+3.0V to +5.5V, 10nA, 250kbps RS-232 Transcei
MAX3238ECAI+T	MAXIM	获取价格	Line Transceiver, 3 Func, 5 Driver, 3 Rcvr, PDSO28, 5.30 MM, 0.65 MM PITCH, SSOP-28
MAX3238ECAI-T	MAXIM	获取价格	Line Transceiver, 3 Func, 5 Driver, 3 Rcvr, PDSO28, 5.30 MM, 0.65 MM PITCH, MO-150, SSOP-2
MAX3238ECDB	TI	获取价格	3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/
MAX3238ECDBR	TI	获取价格	3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/

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