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Datasheet Quick-Ref
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74HC390
Dual Decade Ripple Counter
Datasheet (PDF)
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74HC390
DIP-16
1
1CKA
2
1MR
3
1Q0
4
1CKB
5
1Q1
6
1Q2
7
1Q3
8
GND
16
VCC
15
2CKA
14
2MR
13
2Q0
12
2CKB
11
2Q1
10
2Q2
9
2Q3
vcc
gnd
in
out
io
Pin Reference
⌄
#
Label
Type
1
1CKA
in
2
1MR
in
3
1Q0
out
4
1CKB
in
5
1Q1
out
6
1Q2
out
7
1Q3
out
8
GND
gnd
9
2Q3
out
10
2Q2
out
11
2Q1
out
12
2CKB
in
13
2Q0
out
14
2MR
in
15
2CKA
in
16
VCC
vcc