Philips f181 DATASHEETS
Philips Semiconductors FAST Products Product specification
74F181Arithmetic logic unit
1
March 3, 1989 853–0351 95947
FEATURES
•Provides 16 arithmetic operation: add, subtract, compare, and
double; plus 12 other arithmetic operations
•Provides all 16 logic operations of two variables: Exclusive-OR,
Compare, AND, NAND, NOR, OR, plus 10 other logic operations
•Full look-ahead carry for high speed arithmetic operation on long
words
•40% faster than ’S181 with only 30% ’S181 power consumption
•Available in 300mil-wide Slim 24-pin Dual In-Line package
DESCRIPTION
The 74F181 is a 4-bit high-speed parallel Arithmetic Logic Unit
(ALU). Controlled by the four Function Select inputs (S0–S3) and
the Mode Control input (M), it can perform all the 16 possible logic
operations or 16 different arithmetic operations on active-High or
active-Low operands. The Function Table lists these operations.
PIN CONFIGURATION
SF00193
1
2
3
4
5
6
7
8
9
10
11
12 13
14
15
16
17
18
19
20
21
22
23
24
B
0
A
0
S3
S2
S1
S0
Cn
M
F
0
F
1
F
2
V
CC
A1
B
1
A
2
B
2
A
3
B
3
C
n+4
G
P
A=B
F
3
GND
TYPE TYPICAL PROPAGATION DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F181 7.0ns 43mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V ±10%, T
amb
= 0°C to +70°C
24-Pin Plastic Slim DIP (300 mil) N74F181N
24-Pin Plastic SOL N74F181D
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW
A0–A3 A operand inputs 1.0/3.0 20µA/1.8mA
B0–B3 B operand inputs 1.0/3.0 20µA/1.8mA
M Mode control input 1.0/1.0 20µA/0.6mA
S0–S3 Function select input 1.0/4.0 20µA/2.4mA
Cn Carry input 1.0/5.0 20µA/3.0mA
C
n+4
Carry output 50/33 1.0mA/20mA
P Carry Propagate output 50/33 1.0mA/20mA
G Carry Generate output 50/33 1.0mA/20mA
A=B Compare output OC/33 OC/20mA
F0–F3 Outputs 50/33 1.0mA/20mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
OC = Open Collector
Philips Semiconductors FAST Products Product specification
74F181Arithmetic logic unit
March 3, 1989
2
LOGIC SYMBOL
7
8
6
5
4
3
Cn
M
S0
S1
S2
S3
A0 B0 A1 B1 A2 B2 A3 B3
2 1 23 22 21 20 19 18
9 10 11 13
F0 F1 F2 F3
16
14
17
15
A=B
G
P
C
n+4
Active-High Operands
7
8
6
5
4
3
Cn
M
S0
S1
S2
S3
A0 B0 A1 B1 A2 B2 A3 B3
2 1 23 22 21 20 19 18
9 10 11 13
F0 F1 F2 F3
16
14
17
15
A=B
G
P
C
n+4
Active-Low Operands
VCC = Pin 24
GND = Pin 12
SF00196
IEC/IEEE SYMBOL
SF00197
0
1
2
3
5
6
ALU
[T]
P0
Q0
9
4
M
0
21
8
7
CI
4
17
15
16
14
CP
CG
CO
P=G
22
23
P1
Q1
10
20
21
P2
Q2
11
18
19
P3
Q3
13
Philips Semiconductors FAST Products Product specification
74F181Arithmetic logic unit
March 3, 1989
3
LOGIC DIAGRAM
S0
6
S1
5
S2
4
S3
B3
3
18
A3
19
B2
20
A2
21
A1
23
A0
2
M
8
7
B1
22
B0
1
Cn
V
CC
= Pin 24
GND = Pin 12
17
G
16
C
n+4
15
P
13
F
3
11
F
2
14
A=B
10
F
1
9
F
0
SF00194
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