M74HC323 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M74HC323 Datasheet PDF : 15 Pages
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M54/M74HC299/323
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
INPUTS
INPUTS/OUTPUTS
OUTPUTS
MODE
FUNCTION
CLEAR SELECTED
OUTPUT
CONTROL
CLOCK
SERIAL
A/QA H/QH QA’ QH’
S1 S0 G1 * G2 * (299) (323) SL SR
Z
L
H
H
X
X
X
X
X
Z
Z
L
L
CLEAR
L
L
L
X
L
L
X
X
L
L
L
X
X
X
L
L
L
L
X
X
L
L
L
L
HOLD
H
L
L
L
L
X
X
X QA0 QH0 QA0 QH0
SHIFT
H
RIGHT
H
L
H
L
L
L
H
L
L
X
H
H QGn H QGn
X
L
L QGn L QGn
SHIFT
H
LEFT
H
H
L
L
L
H
L
L
L
H
X QBn H QBn H
L
X QBn L QBn L
LOAD
H
H
H
X
X
X
X
a
h
a
h
* When one or both output controls are high, the eight, input/output terminals are in thehigh impedance state: however sequential operation or clearing
of the register is not affected.
Z : HIGH IMPEDANCE
Qn0 : THE LEVEL OF An BEFORE THE INDICATED STEADY STATE INPUT CONDITIONS WERE ESTABLISHED.
Qnn : THE LEVEL ON Qn BEFORE THE MOST RECENT ACTIVE TRANSITION INDICATED BY
OR
a, h : THE LEVEL OF THE STEADY STATE INPUTS A, H, RESPECTIVELY.
X : DON’T CARE
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