DS8921M National Semiconductor, DS8921M Datasheet

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DS8921M

Manufacturer Part Number
DS8921M
Description
Transceiver IC
Manufacturer
National Semiconductor
Datasheet

Specifications of DS8921M

Device Type
Line
No. Of Drivers
1
Driver Case Style
SOIC
No. Of Pins
16
Mounting Type
Surface Mount
No. Of Channels
2
Peak Reflow Compatible (260 C)
No
No. Of Receivers
1
Supply Voltage
5V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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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

Related parts for DS8921M

DS8921M Summary of contents

Page 1

... 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 Order Number DS8921M, DS8921N, DS8921AM, DS8921AN, Truth Table Input ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Driver Input Voltage Output Voltage Receiver Output Sink Current Receiver Input Voltage Differential Input Voltage Maximum Package Power Dissipation ...

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

... National Semiconductor Asia Pacific Customer Fax: +49 (0) 1 80-530 85 86 Response Group Email: europe.support@nsc.com Tel: 65-2544466 Fax: 65-2504466 Tel: +49 (0) 1 80-532 78 32 Email: sea.support@nsc.com Tel: +49 (0) 1 80-534 16 80 National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179 ...

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