HD74HC78 Datasheet, PDF (2/10 Pages) Hitachi Semiconductor – Dual J-K Flip-Flops (with Preset, Common Clear and Common Clock)

HD74HC78
Function Table
Inputs
Outputs
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
CK 1
1PR 2
1J 3
V_CC 4
CLR 5
2PR 6
2K 7
K _CK J
CLR PR
QQ
K _CK J
CLR PR
QQ
(Top view)
14 1K
13 1Q
12 1Q
11 GND
10 2J
9 2Q
8 2Q
2