M74HC166B1R(1992) 查看數據表（PDF） - STMicroelectronics
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M74HC166B1R Datasheet PDF : 13 Pages
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M54/M74HC166
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 3, 4, 5,
10, 11, 12,
14
6
7
9
13
15
8
16
SYMBOL
SI
A to H
CK INH
CK
CLEAR
QH
S/L
GND
VCC
NAME AND FUNCTION
Serial Data Inputs
Parallel Data Inputs
Clock Enable Input
(Active LOW)
Clock Input (LOW to
HIGH edge-triggered)
Asyncronous Master reset
Input (Active LOW)
Serial Output from the
Last Stage
Parallel Enable Input
(Active LOW)
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOL
TRUTH TABLE
INPUTS
CLEAR SHIFT/LOAD CLOCK INH CLOCK SERIAL IN
L
X
X
X
X
L
X
X
X
H
L
L
X
H
H
L
H
H
H
L
L
H
X
H
X
X
X: Don’t Care
a...........h : The level of steady state input voltage at inputs a trough H respectively
PARALLEL
A...............H
X
X
a................h
X
X
X
INTERNAL
OUTPUTS
OUTPUTS
QA QB
QH
L
L
L
NO CHANGE
a
b
h
H QAn
QGn
L QAn
QGn
NO CHANGE
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