ds8921a National Semiconductor Corporation, ds8921a Datasheet

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ds8921a

Manufacturer Part Number
ds8921a
Description
Differential Line Driver And Receiver Pair
Manufacturer
National Semiconductor Corporation
Datasheet

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© 1998 National Semiconductor Corporation
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
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.
Connection Diagram
Truth Table
±
7V common mode operating range. Hyster-
Order Number DS8921M, DS8921N, DS8921AM, DS8921AN,
V
V
Open
ID
ID
V
V
Input
TH
TH
DS008512
See NS Package Number M08A or N08E
Receiver
(MAX)
(MIN)
DS8921ATM, or DS8921ATN
V
OUT
1
0
1
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
n
n Receiver input hysteresis-70 mV typical
n DS8921AT industrial temperature
Input
of
operation: (−40˚C to +85˚C)
±
1
0
0.2V receiver sensitivity over the input voltage range
±
7V
DS008512-1
Driver
V
OUT
1
0
V
OUT
0
1
www.national.com
May 1998

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ds8921a Summary of contents

Page 1

... Open © 1998 National Semiconductor Corporation DS008512 The DS8921, DS8921A are designed to be compatible with TTL and CMOS. Features 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 ± ...

Page 2

... Driver Input Voltage Output Voltage Receiver Output Sink Current Receiver Input Voltage Differential Input Voltage Maximum Package Power Dissipation @ M Package N Package Derate M Package 9.3 mW/˚C above +25˚C Derate N Package 5.8 mW/˚C above +25˚C DS8921/DS8921A Electrical Characteristics Symbol Conditions RECEIVER V − −7V V +7V ...

Page 3

Receiver Switching Characteristics Figure 1 ( Figure 2 ) Symbol Conditions = pLH L ( Figures pHL L ( Figures –T ...

Page 4

AC Test Circuits and Switching Diagrams FIGURE 1. FIGURE 2. FIGURE 3. DS008512-6 FIGURE 4. DS008512-7 FIGURE 5. www.national.com DS008512-3 DS008512-4 DS008512-5 4 DS008512-2 FIGURE 6. DS008512-10 FIGURE 7. DS008512-11 FIGURE 8. ...

Page 5

Typical Applications ST506 and ST412 Application ESDI Application 5 DS008512-8 DS008512-9 www.national.com ...

Page 6

6 ...

Page 7

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS8921M, DS8921AM or DS8921ATM Order Number DS8921N, DS8921AN or DS8921ATN SO Package (M) NS Package Number M08A Molded Dual-In-Line Package (N) NS Package Number N08E 7 www.national.com ...

Page 8

LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1. Life support devices ...

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