Datasheet > UM3491

UM3491

更新时间： 2024-11-10 02:58:55

品牌	Logo	应用领域
英联电子 - UNIONSEMI		/
页数	文件大小	规格书
17页	363K
描述
3.3V Low Powerï¼Â±15kV ESD-Protected, Fail-Safe, RS-422 Transceivers in SOP14/DIP14

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UM3491 数据手册

UM3488/UM3491

+3.3V Low Power，±15kV ESD-Protected, Fail-Safe,

RS-422 Transceivers

UM3488EESA SOP8

UM3488EEPA DIP8

UM3491EESE SOP14

UM3491EEPE DIP14

General Description

The UM3488/UM3491 is ±15kV electrostatic discharge (ESD)-protected, high-speed transceivers

for RS-422 communication that contain one driver and one receiver. The UM3491 contains an

additional receiver and driver enable control. The device features fail-safe circuitry, which

guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means

that the receiver output will be a logic high if all transmitters on a terminated bus are disabled

(high impedance). The UM3488/UM3491 allows transmit speeds up to 10Mbps. The device

features enhanced ESD protection. All transmitter outputs and receiver inputs are protected to

±15kV using the Human Body Model.

These transceivers typically draw 180µA of supply current when unloaded, or when fully loaded

with the drivers disabled.

The device has a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the

bus. The UM3488/UM3491 is intended for full-duplex communications.

Applications

Features



RS-422 Communications

Level Translators

Transceivers for EMI-Sensitive

Applications



ESD Protection for RS-422 I/O Pins

±15kV, Human Body Model

True Fail-Safe Receiver while Maintaining

EIA/TIA-422 Compatibility



Industrial-Control Local Area

Networks



Maximum Data Rate up to 10Mbps

Error-Free Data Transmission

1nA Low-Current Shutdown Mode

(UM3491)



Allow up to 256 Transceivers on the Bus

Selector Guide

Data

Rate

Slew-

Rate

Low-

Power

Receiver/

Driver

Enable

Quiescent Transceivers

Part

Half/Full

Duplex

Count

Current

(µA)

Bus

Number

(Mbps) Limited Shutdown

UM3488

UM3491

full

Yes

180

256

Yes

Ordering Information

Part Number

UM3488EESA

UM3488EEPA

UM3491EESE

UM3491EEPE

Temperature Range

-40°C to +85°C

Packaging Type

SOP8

Shipping Qty

2500pcs/13 Inch Tape & Reel

50pcs/Tube

DIP8

SOP14

2500pcs/13 Inch Tape & Reel

25pcs/Tube

DIP14

________________________________________________________________________

http://www.union-ic.com Rev.04 Feb.2015 1/17

12 3 4 5 6 7...17

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