M74HC195B1R Просмотр технического описания (PDF) - STMicroelectronics
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M74HC195B1R Datasheet PDF : 13 Pages
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M54/M74HC195
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2
3
4, 5, 6, 7
9
SYMBOL NAME AND FUNCTION
CLEAR
Reset Input (Active
LOW)
J
First Stage J Input
(Active LOW)
K
First Stage K Input
(Active LOW)
A to D Parallel Data Input
SHIFT/LOAD Control Input
10
CLOCK
11
QD
15, 14, 13, 12
8
16
QA to QD
GND
VCC
Clock Input (LOW to
HIGH Edge-triggered)
Inverted Output From
The Last Stage
Paralle Outputs
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOL
TRUTH TABLE
INPUTS
OUTPUS
CLEAR SHIFT/
LOAD
CLOCK
SERIAL
J
K
PARALLEL
QA QB QC
ABCD
L
X
X
X
X
XXXX
L
L
L
H
L
X
X
a
b
c
d
a
b
c
H
H
X
X
X X X X QA0 QB0 QC0
H
H
L
H
X X X X QA0 QA0 QBn
H
H
L
L
XXXX
L
QAn QBn
H
H
H
H
XXXX
H
QAn QBn
H
H
H
L
X X X X QAn QAn
X: Don’t Care: The level of QA, QB, QC, respectively, before the mst recent positive transition of the clock.
QBn
QD
L
d
QD0
QCn
QCn
QCn
QCn
QD
L
d
QD0
QCn
QCn
QCn
QCn
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