UM491 Datasheet Slew-Rate-Limited RS-422 Transceivers

Manufacturer: Union Semiconductor

Download the UM491 datasheet PDF. This datasheet also includes the UM488 variant, as both parts are published together in a single manufacturer document.

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UM491 slew-rate-limited rs-422 transceivers by Union Semiconductor - Datasheet Preview — Note: The manufacturer provides a single datasheet file (UM488-UnionSemiconductor.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number	UM491
Manufacturer	Union Semiconductor
File Size	328.90 KB
Description	Slew-Rate-Limited RS-422 Transceivers
Datasheet	UM491 Datasheet

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

Overview

UM488/UM491 ±15kV ESD-Protected, Fail-Safe, Slew-Rate-Limited RS-422 Transceivers in SOP8/DIP8/SOP14/DIP14.

Key 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 transceiver.

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