DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair DS

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DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair DS

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DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair
DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair
DS8921, DS8921A Differential Line Driver Receiver pairs designed specifically applications meeting ST506, ST412 ESDI Disk Drive Standards. addition, these devices meet requirements Standard RS-422. DS8921, DS8921A receivers offer input sensitivity over common mode operating range. Hysteresis incorporated (typically improve noise margin slowly changing input waveforms. DS8921, DS8921A drivers designed provide unipolar differential drive twisted pair parallel wire transmission lines. Complementary outputs logically ANDed provide output skew (typ.) with propagation delays DS8921, DS8921A designed compatible with CMOS.
Features
typical propagation delay Output skew typical Meet requirements Standard RS-422 Complementary Driver Outputs High differential common-mode input voltage ranges 0.2V receiver sensitivity over input voltage range Receiver input hysteresis-70 typical DS8921AT industrial temperature operation: (-40°C +85°C)
Connection Diagram
DS008512-1
Order Number DS8921M, DS8921N, DS8921AM, DS8921AN, DS8921ATM, DS8921ATN Package Number M08A N08E
Truth Table
Receiver Input (MAX) (MIN) Open VOUT Input Driver VOUT VOUT
1998 National Semiconductor Corporation
DS008512
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Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Supply Voltage Driver Input Voltage -0.5V Output Voltage 5.5V Receiver Output Sink Current Receiver Input Voltage Differential Input Voltage Maximum Package Power Dissipation +25°C Package Package 1160 Derate Package mW/°C above +25°C Derate Package mW/°C above +25°C
Storage Temperature Range Lead Temperature (Soldering, sec.) Maximum Junction Temperature
-65°C +165°C +260°C +260°C +150°C
Recommended Operating Conditions
Supply Voltage Temperature (TA) DS8921/DS8921A DS8921AT Units
DS8921/DS8921A Electrical Characteristics (Notes
Symbol RECEIVER VHYST DRIVER IOFF |VT| |VOS MAX, VOUT MAX, VOUT Logic DRIVER RECEIVER -150 MAX, 0.4V MAX, 2.7V MAX, 7.0V MIN, MIN, MIN, 5.5V -200 -1.5 -7V, (Other Input GND) -10V -400 MAX, VOUT -100 -200 Conditions +200 Units 3.25 -3.25
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Receiver Switching Characteristics
Figure 1(Figure
Symbol TpLH TpHL |TpLH-T pHL| Conditions (Figures (Figures (Figures 8921 22.5 22.5 8921A 8921AT Units
Driver Switching Characteristics
SINGLE ENDED CHARACTERISTICS (Figures Symbol TpLH TpHL TTLH TTHL Skew Conditions (Figures (Figures (Figures (Figures (Figures 8921 8921A 8921AT Units
Driver Switching Characteristics(Note
DIFFERENTIAL CHARACTERISTICS (Figures Symbol TpLH TpHL |TpLH-T pHL| Conditions (Figures (Figures (Figures
Note "Absolute Maximum Ratings" those values beyond which safety device cannot guaranteed. They meant imply that device should operated these limits. Table "Electrical Characteristics" provides conditions actual device operation. Note currents into device pins shown positive values; currents device shown negative; voltages referenced ground unless otherwise specified. values shown classified absolute value basis. Note typical values 25°C. Note Only output time should shorted. Note Difference between complementary outputs point. Note Differential Delays defined calculated results from single ended rise fall time measurements. This approach establishing performance specifications been taken limitations available Automatic Test Equipment (ATE). calculated results assume linear transition between measurement points result following equations:
8921
8921A 2.75 8921AT 2.75
Units
Where: Crossing Point Tra, Trb, time measurements with respect input. Figure
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Test Circuits Switching Diagrams
DS008512-2
FIGURE
DS008512-3
FIGURE
DS008512-10
FIGURE
DS008512-4
FIGURE
DS008512-11
FIGURE
DS008512-5
FIGURE
DS008512-6
FIGURE
DS008512-7
FIGURE
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Typical Applications
ST506 ST412 Application
DS008512-8
ESDI Application
DS008512-9
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Physical Dimensions
inches (millimeters) unless otherwise noted
Package Order Number DS8921M, DS8921AM DS8921ANS Package Number M08A
Molded Dual-In-Line Package Order Number DS8921N, DS8921AN DS8921ATN Package Number N08E
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DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT NATIONAL SEMICONDUCTOR CORPORATION. used herein: critical component component life support Life support devices systems devices sysdevice system whose failure perform reatems which, intended surgical implant into sonably expected cause failure life support body, support sustain life, whose faildevice system, affect safety effectiveness. perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: 80-530 Email: europe.support@nsc.com Deutsch Tel: 80-530 English Tel: 80-532 Tel: 80-532 Italiano Tel: 80-534 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair DS

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