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MM54C374
TRI-STATE Octal D-Type Latch
TL/F/5906
MM54C373/MM74C373
TRI-STATE
Octal
D-Type
Latch
MM54C374/MM74C374
TRI-STATE
Octal
D-Type
Flip-Flop
March 1988
MM54C373/MM74C373 TRI-STATEÉ Octal D-Type Latch
MM54C374/MM74C374 TRI-STATE Octal D-Type Flip-Flop
General Description
The MM54C373/MM74C373, MM54C374/MM74C374are
integrated, complementary MOS (CMOS), 8-bit storageele-
ments with TRI-STATE outputs. These outputs have been
specially designedto drive high capacitive loads, suchas
one mightfind when drivinga bus,andto have afanoutof1
when driving standard TTL. Whena high logic levelisap-
pliedtothe OUTPUT DISABLE input, alloutputsgoto ahigh
impedance state, regardlessof what signalsare presentat
the other inputsandthe stateofthe storage elements.
The MM54C373/MM74C373isan 8-bit latch. When LATCH
ENABLEis high,theQ outputswill followtheD inputs.
When LATCH ENABLE goes low, dataattheD inputs,
which meetsthe set-upand hold time requirements,willbe
retainedatthe outputs until LATCH ENABLE returns high
again.
The MM54C374/MM74C374isan 8-bit, D-type, positive-
edge triggered flip-flop. DataattheD inputs, meetingthe
set-upand hold time requirements,is transferredtotheQ
outputson positive-going transitionsofthe CLOCK input.
Both the MM54C373/MM74C373 andthe MM54C374/
MM74C374are being assembledin 20-pin dual-in-line pack-
ages with 0.300×pin centers.
Features Wide supply voltage range 3Vto 15V High noise immunity 0.45 VCC (typ.) Low power consumption TTL compatibility Fanoutof1
drivingstandardTTL Bus driving capability TRI-STATE outputs Eight storage elementsinone package Single CLOCK/LATCH ENABLEand OUTPUT
DISABLE control inputs 20-pin dual-in-line package with 0.300× centers takes
halfthe board spaceofa 24-pin package
Connection Diagrams
MM54C373/MM74C373
Dual-In-Line Package
TL/F/5906–1
Top View
Order Number MM54C373or MM74C373
MM54C374/MM74C374
Dual-In-Line Package
TL/F/5906–2
TopView
Order NumberMM54C374or MM74C374
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
