DS8921/DS8921A/DS8921AT DS8921/DS8921A/DS8921AT Differential Line

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DS8921/DS8921A/DS8921AT DS8921/DS8921A/DS8921AT Differential Line

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DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair
DS8921/DS8921A/DS8921AT
DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair
General Description
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 DS8921ATJ Package Number J08A, M08A N08E
Truth Table
Receiver Input (MAX) (MIN) Open VOUT Input Driver VOUT VOUT
1997 National Semiconductor Corporation
DS008512
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PrintDate=1997/04/30 PrintTime=08:48:57 6346 ds008512 Rev.
Proof
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 1220 Package Package 1160 Derate Package mW/°C above +25°C Derate Package mW/°C above +25°C
Derate Package Storage Temperature Range Lead Temperature (Soldering, sec.) Maximum Junction Temperature
mW/°C above +25°C -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
Symbol RECEIVER VHYST DRIVER IOFF |VT| |VOS MAX, VOUT MAX, VOUT Logic DRIVER RECEIVER MAX, 0.4V MAX, 2.7V MAX, 7.0V MIN, MIN, MIN, VOUT 5.5V -7V, (Other Input GND) -10V -400 MAX, VOUT -200 Conditions
(Note (Note (Note +200 Units 3.25 -3.25 -200 -1.5 -150 -100
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PrintDate=1997/04/30 PrintTime=08:48:59 6346 ds008512 Rev.
Proof
Receiver Switching Characteristics
Figure 1(Figure
Symbol TpLH TpHL |TpLH-TpHL| 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
DIFFERENTIAL CHARACTERISTICS (Figures Symbol TpLH TpHL |TpLH-TpHL| Conditions (Figures (Figures (Figures
(Note 8921 8921A 2.75 8921AT 2.75 Units
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:
Where: Crossing Point Tra, Trb, time measurements with respect input. Figure
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PrintDate=1997/04/30 PrintTime=08:49:01 6346 ds008512 Rev.
Proof
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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PrintDate=1997/04/30 PrintTime=08:49:02 6346 ds008512 Rev.
Proof
Typical Applications
ST506 ST412 Application
DS008512-8
ESDI Application
DS008512-9
Book Extract
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PrintDate=1997/04/30 PrintTime=08:49:02 6346 ds008512 Rev.
Proof
THIS PAGE IGNORED DATABOOK
PrintDate=1997/04/30 PrintTime=08:49:02 6346 ds008512 Rev.
Proof
Physical Dimensions
inches (millimeters)
Ceramic Dual-In-Line Package Order Number DS8921ATJ Package Number J08A
Package Order Number DS8921M, DS8921AM DS8921ANS Package Number M08A
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PrintDate=1997/04/30 PrintTime=08:49:03 6346 ds008512 Rev.
Proof
DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair
Physical Dimensions
inches (millimeters) (Continued)
Molded Dual-In-Line Package Order Number DS8921N, DS8921AN DS8921ATN Package Number N08E
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 1111 West Bardin Road Arlington, 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 National Semiconductor Europe Fax: (+49) 0-180-530 Email: cnjwge@tevm2.nsc.com Deutsch Tel: (+49) 0-180-530 English Tel: (+49) 0-180-532 Tel: (+49) 0-180-532 Italiano Tel: (+49) 0-180-534 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, Canton Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-043-299-2308 Fax: 81-043-299-2408
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.
PrintDate=1997/04/30 PrintTime=08:49:03 6346 ds008512 Rev.
Proof

DS8921/DS8921A/DS8921AT DS8921/DS8921A/DS8921AT Differential Line

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