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
00851201
Order Number DS8921M, DS8921N, DS8921AM, DS8921AN, DS8921ATM, DS8921ATN Package Number M08A N08E
Truth Table
Receiver Input (MAX) (MIN) Open VOUT Input Driver VOUT VOUT
2004 National Semiconductor Corporation
DS008512
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DS8921/DS8921A/DS8921AT
Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Supply Voltage Driver Input Voltage Output Voltage Receiver Output Sink Current Receiver Input Voltage Differential Input Voltage Package Package Derate Package Derate Package -0.5V 5.5V
Storage Temperature Range Lead Temperature (Soldering, sec.) Maximum Junction Temperature
-65°C +165°C +260°C +260°C +150°C
1160 mW/°C above +25°C mW/°C above +25°C
Recommended Operating Conditions
Supply Voltage Temperature (TA) DS8921/DS8921A DS8921AT Units
Maximum Package Power Dissipation +25°C
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,
Conditions -7V, (Other Input GND) -10V -400 MAX, VOUT
-200
+200
Units
3.25 -3.25 -200 -1.5 -100
5.5V
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DS8921/DS8921A/DS8921AT
Receiver Switching Characteristics
Figure 1(Figure Symbol TpLH TpHL |TpLH-T pHL| Conditions (Figures (Figures (Figures 22.5 8921 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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DS8921/DS8921A/DS8921AT
Test Circuits Switching Diagrams
00851207
FIGURE
00851203
FIGURE
00851202
FIGURE
00851204
FIGURE
00851210
00851205
FIGURE
FIGURE
00851211
FIGURE
00851206
FIGURE
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DS8921/DS8921A/DS8921AT
Typical Applications
ST506 ST412 Application
00851208
ESDI Application
00851209
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DS8921/DS8921A/DS8921AT
Physical Dimensions
unless otherwise noted
inches (millimeters)
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
Notes
National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications. most current product information visit www.national.com. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that products packing materials meet provisions Customer Products Stewardship Specification (CSP-9-111C2) Banned Substances Materials Interest Specification (CSP-9-111S2) contain ``Banned Substances'' defined CSP-9-111S2.
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DS8921/DS8921A/DS8921AT Differential Line Driver Receiver Pair DS

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