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 receiver sensitivity over input voltage range Receiver input hysteresis-70 typical DS8921AT industrial temperature operation (b40
Connection Diagram
8512
Order Number DS8921M DS8921N DS8921AM DS8921AN DS8921ADS8921ATN DS8921ATJ Package Number J08A M08A N08E
Truth Table
Receiver Input (MAX) (MIN) Open VOUT Input Driver VOUT VOUT
C1996 National Semiconductor Corporation
8512
RRD-B30M36 Printed
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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 Output Voltage Receiver Output Sink Current Receiver Input Voltage Differential Input Voltage Maximum Package Power Dissipation Package Package Package
Derate Package Derate Package Derate Package Storage Temperature Range
above above above
Lead Temperature (Soldering Maximum Junction Temperature
Recommended Operating Conditions
Supply Voltage Temperature (TA) DS8921 DS8921A DS8921AT
Units
1220 1160
DS8921 DS8921A Electrical Characteristics (Notes
Symbol RECEIVER VHYST
Units
Conditions
(Other Input GND) b10V
DRIVER IOFF
b400 VOUT
VOUT VOUT
lVTl lVTl
lVOS VOSl
DRIVER RECEIVER VOUT Logic
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Receiver Switching Characteristics (Figures
Symbol TpLH TpHL Conditions (Figures (Figures (Figures 8921 8921A 8921AT Units
lTpLH TpHLl
Driver Switching Characteristics (Figures
SINGLE ENDED CHARACTERISTICS Symbol TpLH TpHL TTLH TTHL Skew Conditions (Figures (Figures (Figures (Figures (Figures 8921 8921A 8921AT Units
Driver Switching Characteristics (Figures
DIFFERENTIAL CHARACTERISTICS (Note Symbol TpLH TpHL Conditions (Figures (Figures (Figures 8921 8921A 8921AT Units
lTpLH TpHLl
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 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 (Tfb Trb) (Tra Tfa) time measurements with respect input Figure
Where Crossing Point
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Test Circuits Switching Diagrams
8512-3
FIGURE
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FIGURE
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FIGURE
FIGURE
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FIGURE FIGURE
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8512-10
FIGURE
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FIGURE
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Typical Applications
ST506 ST412 Application
8512
ESDI Application
8512
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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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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
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critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness
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National does assume responsibility circuitry described circuit patent licenses implied National reserves right time without notice change said circuitry specifications
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