Philips PM2521 Service Manual page 113

HEF4027B
DUAL
JK FLIP-FLOP
101
131
12
Sdi
Jl
0,
|>CPi
FF
Ki
0i
Oqi
15
u
Sd2
J2
02
]>CP2 FF
K2
02
CD2
Functional diagram
FUNCTION TABLES
inputs
outputs
So
s
CP
J
K
0 0
H L
X
X X
H L
L
H X
X
X
L
H
H H
X
X X
H H
H= HIGH
state (the
more
positive voltage)
L=
LOW
state (the less
positive voltage)
X=
state
is
immaterial
J =
positive-going transition
0 +
1
=
state after
clock positive transition
n
[i^rr^|u]pf)2|fiTif?^|iri
VoD
0i 0i
CPi Cqi
Ki
j,
Sqi
^
HEF
4027
B
O
2
O
2
OP
2
^^02
^2
•'2 ^D2
'^SS
LU
IJJ
[4J [5J 1_^ [8J
Pinning diagram
PINNING
J,
K
synchronous
inputs
CP
clock input (L to
H
edge-triggered)
Sq
asynchronous
set -direct input (active
HIGH)
asynchronous
clear-direct input
(active
HIGH)
O
true
output
0
complement
output