M54HC194 Просмотр технического описания (PDF) - STMicroelectronics
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M54HC194 Datasheet PDF : 12 Pages
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M54/M74HC194
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
SYMBOL
CLEAR
2
SR
3, 4, 5, 6
7
A to D
SL
9, 10
11
S0, S1
CLOCK
15, 14, 13, 12
8
16
QA to QD
GND
VCC
NAME AND FUNCTION
Asynchronous Reset
Input (Active LOW)
Serial Data Input (Shift
Right)
Parallel Data Input
Serial Data Input (Shift
Left)
Mode Control Inputs
Clock Input (LOW to
HIGH Edge-triggered)
Paralle Outputs
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOL
TRUTH TABLE
INPUTS
CLEAR
MODE
CLOCK
SERIAL
PARALLEL
QA
S1
S0
LEFT RIGHT A B C D
L
X
X
X
X
X
XXXX
L
H
X
X
X
X
X X X X QA0
H
H
H
X
X
a
b
c
d
a
H
L
H
X
H
XXXX
H
H
L
H
X
L
XXXX
L
H
H
L
H
X
X X X X QBn
H
H
L
L
X
X X X X QBn
H
L
L
X
X
X
X X X X QA0
X: Don’t Care
a ~d
QA0 ~ QD0
QAn ~ QDn
: Don’t Care
: The level of steady state input voltage at input A ~ D respactively
: No change
: The level of QA, QB, QC, respectively, before the mst recent positive transition of the clock.
OUTPUS
QB QC
L
QB0
b
QAn
QAn
QCn
QCn
QB0
L
QC0
c
QBn
QBn
QDn
QDn
QC0
QD
L
QD0
d
QCn
QCn
H
L
QD0
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