Datasheet > STC485E

STC485E

更新时间： 2024-11-26 00:04:19

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STC485

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数据手册

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STC485E 数据手册

STC International Limited

http://www.mcu-memory.com

STC485E

±15kV ESD-Protected,Slew-Rate-Limited,

Fail-Safe,True RS-485 Transceivers

General Description

The STC485E is ±15kV electrostatic discharge (ESD)-protected, high-speed transceivers for RS-485 communication that contains one

driver and one receiver. These devices feature 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 a logic high if all transmitters on a terminated bus are

disabled (high impedance). The STC485E 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 devices feature enhanced ESD protection. All

transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model.

These transceivers typically draw 400µA of supply current when unloaded, or when fully loaded with the drivers disabled.

All devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The STC485E is intended for

half -duplex communications.

Applications

RS-485 Transceivers

Level Translators

Transceivers for EMI-Sensitive Applications

Industrial-Control Local Area Networks

Features

ESD Protection for RS-485 I/O Pins

±15kV— Human Body Model

±15kV— IEC 1000-4-2, Air-Gap Discharge

True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility

Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission

2nA Low-Current Shutdown Mode

–7V to +12V Common-Mode Input Voltage Range

Allows up to 256 Transceivers on the Bus

Thermal Shutdown

Current-Limiting for Driver Overload Protection

Ordering Information

PART

TEMP. RANGE

-40°C to +85°C

PIN-PACKAGE

8 SO

STC485EESA

STC485EEPA

8 Plastic DIP

Selector Guide

GUARANTEED

DATA RATE

DRIVER/

SHUTDOWN Transceivers

±15kV

ESD

PART

Low- Power SLEW-RATE

RECEIVER

ENABLE

Yes

CURRENT

Bus

256

NUMBER

Shutdown

LIMITED

COUNT

(Mbps)

(nA)

PROTECTION

Yes

STC485E

0.5

Yes

STC485E Datasheet Rev.0.1, Dec.2005

Page 1 of 11

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