HD74HC108 Datasheet, PDF (2/9 Pages) Hitachi Semiconductor – Dual J-K Flip-Flops (with Preset, Common Clear and Common Clock)

HD74HC108
Function Table
Inputs
Output
Preset
Clear
Clock
J
K
Q
Q
L
H
X
X
X
H
L
H
L
X
X
X
L
H
L
L
X
X
X
H*¹
H*¹
H
H
L
L
No change
H
H
L
H
L
H
H
H
H
L
H
L
H
H
H
H
Toggle
H
H
L
X
X
No change
H
H
H
X
X
No change
H
Note:
H
X
X
No change
1. Q and Q will remain HIGH as long as preset and Clear are Low, but Q and Q are unpredictable,
if Preset and Clear go HIGH simultaneously.
Pin Arrangement
1K 1
1Q 2
1Q 3
1J 4
2Q 5
2Q 6
GND 7
JK
Q PR
Q CK
CLR
Q
CLR
PR
CK
QJ _K
(Top View)
14 VCC
13 1PR
12 CLR
11 2J
10 2PR
9 CK
8 2K
2