DS8921, DS8921A, DS8921AT

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SNLS374D – MAY 1998 – REVISED JANUARY 2015

9 Application and Implementation

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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