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TC74VHC123AF-X(IC112) :Shift register for relay control
1. Pin layout
1A
1
1B
2
3
1CLR
1Q
4
2Q
5
6
1Cx
2Rx/Cx
7
GND
8
(TOP VIEW)
2. Block diagram
V
CC
R
/C
X
X
Q
N
C
X
A
B
CLR
3. Timing diagram
A
B
CLR
RX/CX
Q
Q
t
w OUT
16
Vcc
15
1Rx/Cx
14
1Cx
13
1Q
12
2Q
11
2CLR
10
2B
2A
9
Vref
L
-
+
Q
P
V
CC
R
D
Q
F/F
CK Q
t
w OUT
Vref
H
C2
Q
Q
t
rr
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
V
CC
V
refH
V
refL
GND
V
OH
V
OL
V
OH
V
OL
t
t
w OUT+
rr
RM-RE9000
1-7
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