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DS8921 Fiches technique(PDF) 1 Page - National Semiconductor (TI)

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No de pièce DS8921
Description  Differential Line Driver and Receiver Pair
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Site Internet  http://www.national.com
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DS8921 Fiches technique(HTML) 1 Page - National Semiconductor (TI)

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DS8921/DS8921A/DS8921AT
Differential Line Driver and Receiver Pair
General Description
The DS8921, DS8921A are Differential Line Driver and Re-
ceiver pairs designed specifically for applications meeting
the ST506, ST412 and ESDI Disk Drive Standards. In addi-
tion, these devices meet the requirements of the EIA Stan-
dard RS-422.
The DS8921, DS8921A receivers offer an input sensitivity of
200 mV over a ±7V common mode operating range. Hyster-
esis is incorporated (typically 70 mV) to improve noise mar-
gin for slowly changing input waveforms.
The DS8921, DS8921A drivers are designed to provide uni-
polar differential drive to twisted pair or parallel wire trans-
mission lines. Complementary outputs are logically ANDed
and provide an output skew of 0.5 ns (typ.) with propagation
delays of 12 ns.
The DS8921, DS8921A are designed to be compatible with
TTL and CMOS.
Features
n 12 ns typical propagation delay
n Output skew - 0.5 ns typical
n Meet the requirements of EIA Standard RS-422
n Complementary Driver Outputs
n High differential or common-mode input voltage ranges
of ±7V
n ±0.2V receiver sensitivity over the input voltage range
n Receiver input hysteresis-70 mV typical
n DS8921AT industrial temperature
operation: (−40˚C to +85˚C)
Connection Diagram
Truth Table
Receiver
Driver
Input
V
OUT
Input
V
OUT
V
OUT
V
ID ≥ VTH (MAX)
1
1
1
0
V
ID ≤ VTH (MIN)
0
0
0
1
Open
1
DS008512-1
Order Number DS8921M, DS8921N, DS8921AM, DS8921AN,
DS8921ATM, or DS8921ATN
See NS Package Number M08A or N08E
May 1998
© 1998 National Semiconductor Corporation
DS008512
www.national.com


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