SN54LS181 Datasheet, PDF (1/9 Pages) Motorola, Inc – 4-BIT ARITHMETIC LOGIC UNIT

4-BIT ARITHMETIC
LOGIC UNIT
The SN54 / 74LS181 is a 4-bit Arithmetic Logic Unit (ALU) which can
perform all the possible 16 logic, operations on two variables and a variety of
arithmetic operations.
• Provides 16 Arithmetic Operations Add, Subtract, Compare, Double,
Plus Twelve Other Arithmetic Operations
• Provides all 16 Logic Operations of Two Variables Exclusive — OR,
Compare, AND, NAND, OR, NOR, Plus Ten other Logic Operations
• Full Lookahead for High Speed Arithmetic Operation on Long Words
• Input Clamp Diodes
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC A1 B1 A2 B2 A3 B3 G Cn+4 P A=B F3
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12
B0 A0 S3 S2 S1 S0 Cn M F0 F1 F2 GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
PIN NAMES
LOADING (Note a)
HIGH
LOW
A0 – A3, B0 – B3
S0 – S3
M
Cn
F0 – F3
A=B
G
P
Cn+4
Operand (Active LOW) Inputs
Function — Select Inputs
Mode Control Input
Carry Input
Function (Active LOW) Outputs
Comparator Output
Carry Generator (Active LOW)
Output
Carry Propagate (Active LOW)
Output
Carry Output
1.5 U.L.
2.0 U.L.
0.5 U.L.
2.5 U.L.
10 U.L.
Open Collector
10 U.L.
10 U.L.
10 U.L.
0.75 U.L.
1.0 U.L.
0.25 U.L.
1.25 U.L.
5 (2.5) U.L.
5 (2.5) U.L.
10 U.L.
5 U.L.
5 (2.5) U.L.
NOTES:
a. 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b. The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
b. Temperature Ranges.
SN54/74LS181
4-BIT ARITHMETIC
LOGIC UNIT
LOW POWER SCHOTTKY
24
1
J SUFFIX
CERAMIC
CASE 623-05
24
1
N SUFFIX
PLASTIC
CASE 649-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
LOGIC SYMBOL
2 1 23 22 21 20 19 18
A0 B0 A1 B1 A2 B2 A3 B3
7
Cn
Cn+4
16
8
M
A=B
14
6
S0
G
17
5
S1
4
S2
P
15
3
S3 _F0
F1
F2
F3
9
10
11
13
VCC = PIN 24
GND = PIN 12
FAST AND LS TTL DATA
5-332