第4章 3线-8线二进制译码器-74hc138.pdf
CD54/74HC138,CD54/74HCT138,
CD54/74HC238,CD54/74HCT238
DatasheetacquiredfromHarrisSemiconductor
SCHS147IHigh-SpeedCMOSLogic3-to8-LineDecoder/
October1997-RevisedAugust2004DemultiplexerInvertingandNoninverting
FeaturesOrderingInformation
•SelectOneOfEightDataOutputs
TEMP.RANGE
ActiveLowfor138,ActiveHighfor238o
[/TitlePARTNUMBER(C)PACKAGE
•l/OPortorMemorySelector
(CD74CD54HC138F3A-55to12516LdCERDIP
HC138•ThreeEnableInputstoSimplifyCascadingCD54HC238F3A-55to12516LdCERDIP
•TypicalPropagationDelayof13nsatV=5V,
,
CC
CD74CL=15pF,TA=25oCCD54HCT138F3A-55to12516LdCERDIP
HCT13•Fanout(OverTemperatureRange)CD54HCT238F3A-55to12516LdCERDIP
8,-StandardOutputs...............10LSTTLLoadsCD74HC138E-55to12516LdPDIP
CD74