Philips PM2521 Service Manual page 115

125
HEF4070B
QUADRUPLE
EXCLUSIVE-OR
GATE
Functional diagram
|TZ1
[T^ [T^ FI
[9l
fi]
Q Q
>
Ig I7
O4 O3
<6
5
D
HEF 4070
B
I2
0-|
O2
1
3
I4
Vss
UJ
Lll
[
3 j
[
4
j
llJ
Tir
ill
Pinning diagram
TRUTH TABLE
'1
'2
°1
L L L
H
L
H
L
H
H
H H
L
H
= HIGH
state (the
more
positive voltage)
L
=
LOW
state (the
less
positive voltage)
Logic diagram (one
gate)
HEF40106B
HEX SCHMITT TRIGGER
Functional diagram
Logic diagram (one
inverter)