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UM491

Union Semiconductor
Part Number UM491
Manufacturer Union Semiconductor
Description Slew-Rate-Limited RS-422 Transceivers
Published Jan 14, 2019
Detailed Description UM488/UM491 ±15kV ESD-Protected, Fail-Safe, Slew-Rate-Limited RS-422 Transceivers in SOP8/DIP8/SOP14/DIP14 General Des...
Datasheet PDF File UM491 PDF File

UM491
UM491

Overview
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...


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