ds8922 National Semiconductor Corporation, ds8922 Datasheet

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ds8922

Manufacturer Part Number
ds8922
Description
Tri-state Rs-422 Dual Differential Line Driver And Receiver Pairs
Manufacturer
National Semiconductor Corporation
Datasheet

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© 1998 National Semiconductor Corporation
DS8922/DS8922A/DS8923A TRI-STATE
RS-422 Dual Differential Line Driver and Receiver Pairs
General Description
The DS8922/22A and DS8923A are Dual Differential Line
Driver and Receiver pairs. These devices are designed spe-
cifically for applications meeting the ST506, ST412 and
ESDI Disk Drive Standards. In addition, the devices meet the
requirements of the EIA Standard RS-422.
These devices offer an input sensitivity of 200 mV over a
±
rated (typically 70 mV) to improve noise margin for slowly
changing input waveforms. An input fail-safe circuit is pro-
vided such that if the receiver inputs are open the output as-
sumes the logical one state.
The DS8922A and DS8923A drivers are designed to provide
unipolar 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.
Both devices feature TRI-STATE outputs. The DS8922/22A
have independent control functions common to a driver and
receiver pair. The DS8923A has separate driver and receiver
control functions.
Connection Diagrams
TRI-STATE
7V common mode operating range. Hysteresis is incorpo-
®
is a registered trademark of National Semiconductor Corp.
DS008511
See NS Package Number M16A or N16E
Order Number DS8922M, DS8922N,
DS8922A Dual-In-Line
DS8922AM or DS8922AN
Power up/down circuitry is featured which will TRI-STATE
the outputs and prevent erroneous glitches on the transmis-
sion lines during system power up or power down operation.
The DS8922/22A and DS8923A are designed to be compat-
ible with TTL and CMOS.
Features
n 12 ns typical propagation delay
n Output skew —
n Meets the requirements of EIA Standard RS-422
n Complementary Driver Outputs
n High differential or common-mode input voltage ranges
n
n Receiver input fail-safe circuitry
n Receiver input hysteresis — 70 mV typical
n Glitch free power up/down
n TRI-STATE outputs
of
±
0.2V receiver sensitivity over the input voltage range
±
7V
DS008511-1
±
®
0.5 ns typical
www.national.com
June 1998

Related parts for ds8922

ds8922 Summary of contents

Page 1

... Power up/down circuitry is featured which will TRI-STATE the outputs and prevent erroneous glitches on the transmis- sion lines during system power up or power down operation. The DS8922/22A and DS8923A are designed to be compat- ible with TTL and CMOS. Features typical propagation delay ± ...

Page 2

... Connection Diagrams (Continued) Truth Tables DS8922/22A EN1 EN2 RO1 0 0 ACTIVE ACTIVE 1 1 HI-Z DS8923A DEN REN RO1 0 0 ACTIVE 1 0 ACTIVE HI-Z www.national.com DS8923A Dual-In-Line DS008511-2 Order Number DS8923AM, DS8923AN, See NS Package Number M16A or N16E RO2 DO1 ...

Page 3

... National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Drive Input Voltage Output Voltage Receiver Output Sink Current Receiver Input Voltage Differential Input Voltage Maximum Package Power Dissipation @ +25˚C M Package DS8922/22A and DS8923A Electrical Characteristics Symbol Conditions RECEIVER V − −7V ...

Page 4

Receiver Switching Characteristics ( Figures Parameter Conditions pLH pHL –T | pLH pHL Skew (Channel to Channel) ...

Page 5

Switching Time Waveforms AC Test Circuits and Switching Waveforms DS008511-3 FIGURE 1. DS008511-5 FIGURE 2. 5 DS008511-4 www.national.com ...

Page 6

AC Test Circuits and Switching Waveforms www.national.com (Continued) DS008511 Closed Open +2.5V PLZ T Open Closed −2.5V PHZ T Closed Open +2.5V PZL T Open Closed −2.5V PZH FIGURE 3. DS008511-7 FIGURE 4. DS008511-8 FIGURE 5. ...

Page 7

AC Test Circuits and Switching Waveforms Typical Performance Characteristics Driver Temperature DS008511-14 Driver Temperature DS008511-16 (Continued) DS008511-10 FIGURE 7. DS008511-13 FIGURE 8. (DS8923A) Driver ...

Page 8

Typical Performance Characteristics Receiver Temperature Receiver Temperature Driver Differential Propagation Delay vs Temperature www.national.com (DS8923A) (Continued) Receiver DS008511-18 Receiver V vs ...

Page 9

Typical Performance Characteristics Receiver Propagation Delay vs Temperature DS008511-24 Driver V vs Temperature OD DS008511-26 Driver DS008511-28 (DS8923A) (Continued) Receiver Propagation Delay DS008511-25 Driver DS008511-27 Driver Differential ...

Page 10

Typical Performance Characteristics Driver Differential Transition Time Supply Current Driver Short Circuit Current vs Temperature www.national.com (DS8923A) (Continued) Supply Current vs Temperature DS008511- Driver Switching Frequency CC DS008511-32 Driver Short Circuit Current ...

Page 11

Typical Performance Characteristics Receiver Short Circuit Current vs Temperature DS008511-36 Typical Applications (DS8923A) (Continued) Receiver Short Circuit Current ESDI Application 11 DS008511-37 DS008511-11 www.national.com ...

Page 12

Typical Applications (Continued) www.national.com ST504 and ST412 Applications 12 DS008511-12 ...

Page 13

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS8922M, DS8922AM, or DS8923AM Order Number DS8922N, DS8922AN, or DS8923AN SO Package (M) NS Package Number M16A Molded Dual-In-Line Package (N) NS Package Number N16E 13 www.national.com ...

Page 14

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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