Philips pm2521 - Page 132

140
QUAD 2-INPUT NAND GATE
PIN CONFIGURATIONS
74LS00
TRIPLE 3-INPUT NAND GATE
PIN
CONFIGURATIONS
QUAD 2-INPUT EXCLUSIVE-OR GATE
PIN CONFIGURATIONS
TRUTH TABLE
74LS86
inputs output
A
B Y
L L L
L H H
H
L H
H
H L
L
=
LOW voltage level.
H
=
HIGH
voltage level.
74LS244
OCTAL
BUFFERS
(3-STATE)
PIN
CONFIGURATIONS
TRUTH TABLE
Inputs
Outputs
1
a
B
Y
a
Yb
m
1
L.
H L
jnHj
1
H
X H
1
(Z)
H
=
HIGH
voltage level
L
=
LOW
voltage level
X
=
Don't care
(Z)
=
High impedance (off) state