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M74HC194 bảng dữ liệu(PDF) 2 Page - STMicroelectronics

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M74HC194 bảng dữ liệu(HTML) 2 Page - STMicroelectronics

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INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
INPUTS
OUTPUS
CLEAR
MODE
CLOCK
SERIAL
PARALLEL
QA
QB
QC
QD
S1
S0
LEFT
RIGHT
ABCD
L
X
X
X
X
X
XXXX
L
L
L
L
H
X
X
X
X
XXXX
QA0
QB0
QC0
QD0
H
H
H
X
X
abc
d
a
b
c
d
H
L
H
X
H
XXXX
H
QAn
QBn
QCn
H
L
H
X
L
XXXX
L
QAn
QBn
QCn
H
H
L
H
X
XXXX
QBn
QCn
QDn
H
H
H
L
L
X
XXXX
QBn
QCn
QDn
L
H
L
L
X
X
X
XXXX
QA0
QB0
QC0
QD0
X: Don’t Care
: Don’t Care
a ~ d
: The level of steady state input voltage at input A ~ D respactively
QA0 ~ QD0
: No change
QAn ~ QDn
: The level of QA, QB, QC, respectively, before the mst recent positive transition of the clock.
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
1
CLEAR
Asynchronous Reset
Input (Active LOW)
2
SR
Serial Data Input (Shift
Right)
3, 4, 5, 6
A to D
Parallel Data Input
7
SL
Serial Data Input (Shift
Left)
9, 10
S0, S1
Mode Control Inputs
11
CLOCK
Clock Input (LOW to
HIGH Edge-triggered)
15, 14, 13, 12
QA to QD
Paralle Outputs
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
IEC LOGIC SYMBOL
M54/M74HC194
2/12


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