DM74LS40 Dual 4-Input NAND Buffer
February 1992
DM74LS40
Dual 4-Input NAND Buffer
General Description
This device contains two independent gates each of which
perform the logic NAND function
Connection Diagrams
Dual-In-Line Package
TL F 10171 鈥?1
Order Number DM74LS40M or DM74LS40N
See NS Package Number M14A or N14A
Function Table
(Each Gate)
Inputs
A
H
L
X
X
X
B
H
X
L
X
X
C
H
X
X
L
X
D
H
X
X
X
L
Outputs
Y
L
H
H
H
H
Logic Diagram (Each Gate)
TL F 10171 鈥?2
Positive Logic
Y
e
A
B
C
D or Y
e
A
a
B
a
C
a
D
C
1995 National Semiconductor Corporation
TL F 10171
RRD-B30M105 Printed in U S A