第4章 双向4位移位寄存器-74hc194.pdf
CD54HC194,CD74HC194,
CD74HCT194
DatasheetacquiredfromHarrisSemiconductor
SCHS164G
High-SpeedCMOSLogic
September1997-RevisedMay20064-BitBidirectionalUniversalShiftRegister
FeaturesDescription
•FourOperatingModesThe’HC194andCD74HCT194are4-bitshiftregisterswith
-ShiftRight,ShiftLeft,HoldandResetAsynchronousMasterReset(MR).Intheparallelmode(S0
[/Title•SynchronousParallelorSerialOperationandS1arehigh),dataisloadedintotheassociatedflip-flop
(CD74andappearsattheoutputafterthepositivetransitionofthe
•Typicalf=60MHzatV=5V,C=15pF,clockinput(CP).Duringparallelloadingserialdataflowis
HC194,MAXCCL
TA=25oCinhibited.Shiftleftandshiftrightareaccomplished
CD74H
synchronouslyonthepositiveclockedgewithserialdata
CT194)•AsynchronousMasterResetenteredattheshiftleft(DSL)serialinputfortheshiftleft
/Sub-•Fanout(OverTemperatureRange)mode,andat