CD54HC123_07 Datasheet, PDF (2/19 Pages) Texas Instruments – High-Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Resets

Pinout
CD54/74HC123, CD54/74HCT123, CD74HC423, CD74HCT423
CD54HC123, CD54HCT123
(CERDIP)
CD74HC123
(PDIP, SOIC, SOP, TSSOP)
CD74HC423
(PDIP, SOIC, SOP)
CD74HCT123, CD74HCT423
(PDIP, SOIC)
TOP VIEW
1A 1
1B 2
1R 3
1Q 4
2Q 5
2C_X 6
2R_XC_X 7
GND 8
16 V_CC
15 1R_XC_X
14 1C_X
13 1Q
12 2Q
11 2R
10 2B
9 2A
Functional Diagram
1A
1
1B
2
1R
3
11
2R
9
2A
10
2B
1Cx 1Rx
14
15
V_CC
1Cx
1RxCx
13
1Q
MONO 1
4
1Q
MONO 2
5
2Q
12
2Q
2Cx
2RxCx
6
7
2Cx 2Rx
V_CC
TRUTH TABLE
INPUTS
A
B
R
CD74HC/HCT123
H
X
H
X
L
H
L
↑
H
OUTPUTS
Q
Q
L
H
L
H
↓
H
H
X
X
L
L
H
L
H
↑
CD74HC/HCT423
H
X
H
L
H
X
L
H
L
H
L
↑
H
↓
H
H
X
X
L
L
H
H = High Voltage Level, L = Low Voltage Level,
X = Don’t Care.
2