SN74LS122 SN74LS123
SN74LS123
(TOP VIEW)
(SEE NOTES 1 THRU 4)
V
CC
16
1 R
ext/ 1
C
ext
C
ext
15
14
1Q
13
2Q
12
2
CLR
11
2B
10
2A
9
Q
CLR Q
1
1A
2
1B
3
1
CLR
4
1Q
5
2Q
Q
Q
CLR
6
2
C
ext
8
7
2 GND
R
ext/
C
ext
SN74LS122
(TOP VIEW)
(SEE NOTES 1 THRU 4)
V
CC
14
R
ext/
C
ext
13
NC
12
C
ext
11
NC
10
R
int
Q
CLR Q
1
A1
2
A2
3
B1
4
B2
5
CLR
6
Q
7
GND
R
int
9
Q
8
NC — NO INTERNAL CONNECTION.
NOTES:
1. An external timing capacitor may be connected between C
ext
and R
ext
/C
ext
(positive).
2. To use the internal timing resistor of the LS122, connect R
int
to V
CC
.
3. For improved pulse width accuracy connect an external resistor between R
ext
/C
ext
and V
CC
with R
int
open-circuited.
4. To obtain variable pulse widths, connect an external variable resistance between R
int
/C
ext
and V
CC
.
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