dm74ls181 National Semiconductor Corporation, dm74ls181 Datasheet - Page 4

• Manufacturer Part Number: dm74ls181
• Description: 4-bit Arithmetic Logic Unit
• Manufacturer: National Semiconductor Corporation

Sum Mode Test Table I
Diff Mode Test Table II
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
Under
Under
Input
Input
Test
Test
C
C
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
n
n
i
i
Apply
None
None
None
None
None
Apply
None
None
None
None
None
None
4 5V
4 5V
B
A
B
A
A
A
B
A
B
i
i
Other Input
Other Input
Function Inputs
Function Inputs
Same Bit
Same Bit
Apply
None
None
None
None
None
GND
Apply
None
None
None
None
None
None
GND
B
A
B
A
B
B
A
B
A
4
S1
S0
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
A and B
A and B
A and B
Apply
None
None
Apply
4 5V
e
None
None
None
None
None
None
e
4 5V
All
B
B
B
B
A
All
A
A
A
A
S2
S3
Other Data Inputs
Other Data Inputs
e
e
4 5V S0
4 5V S1
e
e
A and B C
A and B C
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
A and B C
A and B C
A and B C
A and B C
A and B C
A and B C
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
Remaining
S3
S2
Apply
A C
A C
A C
A C
GND
Apply
B C
B C
B C
B C
None
GND
C
C
All
B
e
n
n
e
n
n
n
n
n
n
n
n
M
M
n
n
e
n
n
n
n
n
n
e
0V
0V
or C
Output
Under
Output
C
C
Any F
Under
A
A
Test
C
C
C
Test
n
n
F
F
G
G
n
n
n
P
P
e
e
F
F
G
G
P
P
a
a
n
a
a
a
i
i
i
i
a
4
4
B
B
4
4
4
4