Datasheet > UM491

UM491

更新时间： 2024-09-14 01:15:31

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
Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission

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中文翻译

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数据手册

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UM491 数据手册

UM488/UM491

±15kV ESD-Protected, Fail-Safe, Slew-Rate-Limited RS-422

Transceivers in SOP8/DIP8/SOP14/DIP14

General Description

The UM488/UM491 is ±15kV electrostatic discharge (ESD)-protected, high-speed transceivers for

RS-422 communication that contain one driver and one receiver. The UM491 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

UM488/UM491 offers higher driver output slew-rate limits, allowing transmit speeds up to 2.5Mbps.

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 375µA 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 UM488/UM491 is intended for full-duplex communications.

Applications

Features



RS-422 Communications

Level Translators

Transceivers for EMI-Sensitive

Applications

Industrial-Control Local Area Networks



ESD Protection for RS-422 I/O Pins

±15kV, Human Body Model

True Fail-Safe Receiver while Maintaining

EIA/TIA-422 Compatibility

Enhanced Slew-Rate Limiting Facilitates

Error-Free Data Transmission

1nA Low-Current Shutdown Mode

(UM491)



Allow up to 256 Transceivers on the Bus

Selector Guide

Data

Rate

Slew-

Rate

Low-

Power

Receiver/

Driver

Enable

Quiescent Transceivers

Part

Number

Half/Full

Duplex

Count

Current

(µA)

Bus

(Mbps) Limited Shutdown

UM488

UM491

full

2.5

Yes

375

256

Yes

Ordering Information

Part Number

UM488EESA

UM488EEPA

UM491EESE

UM491EEPE

Temperature Range

-40°C to +85°C

Packaging Type

SOP8

Shipping Qty

2500pcs/13 Inch

Tape & Reel

DIP8

50pcs/Tube

2500pcs/13 Inch

Tape & Reel

SOP14

DIP14

25pcs/Tube

________________________________________________________________________

http://www.union-ic.com Rev.05 Dec.2014 1/17

12 3 4 5 6 7...17

中文翻译

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与UM491相关器件

型号	品牌	获取价格	描述	数据表
UM491EEPE	UNIONSEMI	获取价格	Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission
UM491EESE	UNIONSEMI	获取价格	Â±15kV ESD-Protected, Fail-Safe, Slew-Rate-Li
UM4953	UNITPOWER	获取价格	Dual P-Ch 30V Fast Switching MOSFETs
UM4B	YFW	获取价格	0.8A SURFACE MOUNT GLASS PASSIVATED BRIDGE RECTIFIER
UM4B-08-FREQ1	PLETRONICS	获取价格	Parallel - Fundamental Quartz Crystal, 10MHz Min, 14.999MHz Max, MINIATURE, METAL PACKAGE-
UM4B-08-FREQ2	PLETRONICS	获取价格	Parallel - Fundamental Quartz Crystal, 15MHz Min, 37MHz Max, MINIATURE, METAL PACKAGE-2
UM4B-08-FREQ3	PLETRONICS	获取价格	Parallel - 3Rd Overtone Quartz Crystal, 25MHz Min, 90MHz Max, MINIATURE, METAL PACKAGE-2
UM4B-08-FREQ4	PLETRONICS	获取价格	Parallel - 5Th Overtone Quartz Crystal, 60MHz Min, 150MHz Max, MINIATURE, METAL PACKAGE-2
UM4B-10	MDD	获取价格	SINGLE PHASE GLASS PASSIVATED BRIDGE RECTIFIERS
UM4B-12-FREQ1	PLETRONICS	获取价格	Parallel - Fundamental Quartz Crystal, 10MHz Min, 14.999MHz Max

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