DS8921_15 Datasheet, PDF (9/20 Pages) Texas Instruments – Differential Line Driver and Receiver Pair

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9 Application and Implementation
DS8921, DS8921A, DS8921AT
SNLS374D – MAY 1998 – REVISED JANUARY 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The DS8921 is a differential line driver and receiver pair in a single package, designed for applications for the
ST506, ST412, and ESDI Disk Drive Standards. The DS8921 is compatible to EIA RS-422 signaling standards,
supporting 200-mV input sensitivity across a ±7-V common mode operating range. This transceiver is intended
for driving differential signal across long transmission lines and translating received differential signals into their
CMOS/TTL single-ended equivalence. The DS8921 transmits and reproduces received data in communications
links where ground reference difference, or noisy environment are common.
9.2 Typical Application
Figure 11 shows a typical implementation of the DS8921x device in a ST506 and ST412 disk drive application.
The differential outputs of the driver are connected to a twisted-pair transmission line, carrying data from the
driver to the differential receiver at the other end of the cable. A differential termination resistor should be
connected across the input pins of the receiver.
Figure 11. ST506 and ST412 Application
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Product Folder Links: DS8921 DS8921A DS8921AT