DS8921ATN ,Differential Line Driver and Receiver PairFeaturesthe ST506, ST412 and ESDI Disk Drive Standards. In addi-n 12 ns typical propagation delayti ..
DS8921M ,Differential Line Drivers and Receiver PairGeneral DescriptionTTL and CMOS.The DS8921, DS8921A are Differential Line Driver and Re-ceiver pair ..
DS8921MX ,Differential Line Drivers and Receiver PairFeaturesthe ST506, ST412 and ESDI Disk Drive Standards. In addi-n 12 ns typical propagation delayti ..
DS8921N ,Differential Line Drivers and Receiver PairFeaturesthe ST506, ST412 and ESDI Disk Drive Standards. In addi-n 12 ns typical propagation delayti ..
DS8922AM ,TRI-STATE RS-422 Dual Differential Line Drivers and Receiver PairGeneral Descriptionthe outputs and prevent erroneous glitches on the transmis-The DS8922/22A and DS ..
DS8922AMX ,TRI-STATE RS-422 Dual Differential Line Drivers and Receiver PairGeneral Descriptionthe outputs and prevent erroneous glitches on the transmis-The DS8922/22A and DS ..
DS8921ATN
Differential Line Driver and Receiver Pair
DS8921/DS8921A/DS8921AT
Differential Line Driver and Receiver Pair
General DescriptionThe DS8921, DS8921Aare Differential Line DriverandRe-
ceiver pairs designed specificallyfor applications meeting
the ST506, ST412and ESDI Disk Drive Standards.In addi-
tion, these devices meetthe requirementsoftheEIA Stan-
dard RS-422.
The DS8921, DS8921A receivers offeran input sensitivityof
200mV overa ±7V common mode operating range. Hyster-
esisis incorporated (typically70 mV)to improve noise mar-
ginfor slowly changing input waveforms.
The DS8921, DS8921A driversare designedto provideuni-
polar differential driveto twistedpairor parallel wire trans-
mission lines. Complementary outputsare logically ANDed
and providean output skewof0.5ns (typ.)with propagation
delaysof12ns.
The DS8921, DS8921Aare designedtobe compatible with
TTLand CMOS.
Features12ns typical propagation delay Output skew-0.5ns typical Meetthe requirementsofEIA Standard RS-422 Complementary Driver Outputs High differentialor common-mode input voltage ranges ±7V ±0.2V receiver sensitivity overthe input voltage range Receiver input hysteresis-70mV typical DS8921AT industrial temperature
operation: (−40˚Cto +85˚C)
Connection Diagram
Truth Table
Receiver Driver
Input VOUT Input VOUT VOUTVID≥VTH (MAX) 1 1 1 0
VID≤VTH (MIN) 0 0 0 1
Open 1
DS008512-1
Order Number DS8921M, DS8921N, DS8921AM, DS8921AN,
DS8921ATM,or DS8921ATN
SeeNS Package Number M08Aor N08EMay 1998
DS8921/DS8921A/DS8921A
Differential
Line
Driver
and
Receiver
Pair 1998 National Semiconductor Corporation DS008512
