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MM74HC374
TRI-STATE(RM) Octal D-Type Flip-Flop
TL/F/5336
MM54HC374/MM74HC374
TRI-STATE
Octal
D-Type
Flip-Flop
January 1988
MM54HC374/MM74HC374
TRI-STATEÉ Octal D-Type Flip-Flop
General Description
These high speed Octal D-Type Flip-Flops utilize advanced
silicon-gateCMOS technology.They possessthe high noise
immunity andlow power consumptionof standard CMOS
integrated circuits,as wellasthe abilityto drive15 LS-TTL
loads. Duetothe large output drive capabilityandthe TRI-
STATE feature, these devicesare ideally suitedfor interfac-
ing withbus linesinabus organized system.
These devicesare positive edge triggered flip-flops. Dataat
theD inputs, meetingthe setup andhold time requirements,
are transferredto theQ outputson positive goingtransitionsthe CLOCK (CK) input. Whena high logic levelis appliedthe OUTPUT CONTROL (OC) input,all outputsgotoa
high impedance state, regardlessof what signalsare pres-
entatthe other inputs andthe stateofthe storage ele-
ments.
The 54HC/74HC logic familyis speed, function,and pinout
compatible withthe standard 54LS/74LS logic family.All
inputsare protected from damagedueto staticdischargeby
internal diode clampsto VCCand ground.
Features Typical propagation delay:20ns Wide operating voltage range: 2–6V Low input current:1mA maximum Low quiescent current:80mA maximum Compatible with bus-oriented systems Output drive capability:15 LS-TTL loads
Connection Diagram
Dual-In-Line Package
TL/F/5336–1
Top View
OrderNumber MM54HC374orMM74HC374
Truth Table
Output Clock Data OutputControl u HH u LL X Q0 X Zehigh Level,Le LowLeveledon’tCare transitionfrom low-to-highehigh impedancestate
Q0ethe levelofthe output beforesteadystate
inputconditionswere established
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorp
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
