Datasheet > UM3487EESA

UM3487EESA

更新时间： 2024-02-15 06:12:37

品牌	Logo	应用领域
英联电子 - UNIONSEMI		/
页数	文件大小	规格书
14页	672K
描述
Â±15kV ESD-Protected, Fail-Safe, Hot-Swappable Auto Polarity Reversal RS-485 Transceivers

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UM3487EESA 数据手册

UM3487E

±15kV ESD-Protected, Fail-Safe, Hot-Swappable

Auto Polarity Reversal RS-485 Transceivers

UM3487E SOP8/DIP8

General Description

The UM3487E series are +3.3V powered ±15kV ESD protected, fail-safe, hot-swappable, auto

polarity reversal RS-485 transceivers. The device includes fail-safe circuitry, which guarantees a

logic-high receiver output when the receiver inputs are open, shorted or idle. This means that the

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

impedance). The UM3487E features reduced slew-rate driver that minimizes EMI and reduces

reflections caused by improperly terminated cables, allowing error-free data transmission up to

500kbps. All transmitter outputs and receiver inputs are protected to ±15kV using the Human

Body Model and IEC61000-4-2, Air-Gap Discharge.

The UM3487E includes cable auto-invert functions that reverse the polarity of the RS485 bus pins

in case the cable is misconnected. Receiver’s full fail-safe features are maintained even when the

receiver polarity has been reversed.

The transceivers typically draw 300μA 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 and is intended for half-duplex communications.

Applications

Features



Smart Meters/Automated Meter

Reading Systems

Industrial-Control Local Area

Networks

PROFIBUS® and Other RS-485 Based

Field Bus Networks

Building Lighting and Environmental

Control Systems

High Node Count RS-485 Systems

Transceivers for EMI-Sensitive

Applications



Automatic Polarity Reversal RS-485

Transceivers

I/O logic compatible with +5V, +3.3V &

+1.8V logic

ESD Protection for RS-485 I/O Pins

±15kV—IEC61000-4-2, Air-Gap Discharge

±8kV—IEC61000-4-2, Contact Discharge

True Fail-Safe Receiver

Enhanced Slew-Rate Limiting

–7V to +12V Common-Mode Input Voltage

Range



Allows up to 256 Transceivers on the Bus

Thermal Shutdown

Current-Limiting for Driver Overload

Protection

Pin Configurations

Top View

V_CC

XXXXXX

XXXX

GND

Ordering Information

Part Number

Marking Code

UM3487EESA

UM3487EEPA

Operating Temperature

-40°C to +85°C

Package Type

SOP8

UM3487EESA

UM3487EEPA

-40°C to +85°C

DIP8

________________________________________________________________________

http://www.union-ic.com Rev.02 Jan.2014 1/14

12 3 4 5 6 7...14

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与UM3487EESA相关器件

型号	品牌	获取价格	描述	数据表
UM3488	UNIONSEMI	获取价格	Low Power, ESD-Protected, Fail-Safe, RS-422 Transceivers
UM3488EEPA	UNIONSEMI	获取价格	Low Power, ESD-Protected, Fail-Safe, RS-422 Transceivers
UM3488EESA	UNIONSEMI	获取价格	Low Power, ESD-Protected, Fail-Safe, RS-422 Transceivers
UM348X	UMC	获取价格	Multi-Instrument Melody Generator
UM3491	UNIONSEMI	获取价格	3.3V Low Powerï¼Â±15kV ESD-Protected, Fail-S
UM3491EEPE	UNIONSEMI	获取价格	Low Power, ESD-Protected, Fail-Safe, RS-422 Transceivers
UM3491EESE	UNIONSEMI	获取价格	Low Power, ESD-Protected, Fail-Safe, RS-422 Transceivers
UM3491H	ETC	获取价格	Analog IC
UM3492	ETC	获取价格	Analog IC
UM3492H	ETC	获取价格	Analog IC

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