DS8921_15 Datasheet, PDF (1/20 Pages) Texas Instruments – Differential Line Driver and Receiver Pair

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DS8921, DS8921A, DS8921AT
SNLS374D – MAY 1998 – REVISED JANUARY 2015
DS8921x Differential Line Driver and Receiver Pair
1 Features
•1 12-ns Typical Propagation Delay
• Output Skew: 0.5 ns Typical
• Meets the Requirements of EIA Standard RS-422
• Complementary Driver Outputs
• High Differential or Common-Mode Input Voltage
Ranges of ±7 V
• ±0.2 V Receiver Sensitivity Over the Input Voltage
Range
• Receiver Input Hysteresis: 70 mV Typical
• DS8921AT Industrial Temperature Operation:
(−40°C to +85°C)
2 Applications
• Differential Line Driver and Receiver for:
– ST506 Disk Drive Standard
– ST412 Disk Drive Standard
– ESDI Disk Drive Standard
– RS-422 Interface
3 Description
The DS8921, DS8921A, and DS8921AT devices are
differential line driver and receiver pairs designed
specifically for applications meeting the ST506,
ST412, and ESDI disk drive standards. In addition,
these devices meet the requirements of the EIA
standard RS-422.
The DS8921x receivers offer an input sensitivity of
200 mV over a ±7 V common mode operating range.
Hysteresis is incorporated (typically 70 mV) to
improve noise margin for slowly changing input
waveforms.
The DS8921x drivers are designed to provide
unipolar differential drive to twisted-pair or parallel
wire transmission lines. Complementary outputs are
logically ANDed and provide an output skew of 0.5 ns
(typical) with propagation delays of 12 ns.
The DS8921x devices are designed to be compatible
with TTL and CMOS.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DS8921
DS8921A
DS8921AT
SOIC (8)
PDIP (8)
4.90 mm x 3.91 mm
9.81 mm x 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
SPACE
Typical Application Block Diagram
Simplified Functional Block Diagram
RI+
RO
RI-
DI
5.0 V
VCC
0.1 µF
DO+
DO-
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.