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M74HC181M1R Fiches technique(PDF) 2 Page - STMicroelectronics

No de pièce M74HC181M1R
Description  ARITHMETIC LOGIC UNIT/FUNCTION GENERATOR
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HC181M1R Fiches technique(HTML) 2 Page - STMicroelectronics

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DESCRIPTION (continued)
in the subtract mode with Cn = H when performing this
comparison. The A = B output is open-drain so that it
can be wire-AND connected to give a comparison for
more that four bits. The carry output (Cn + 4) can also
be used to supply relative magnitude information.
Again, the ALU should be placed in the subtract mode
by placing the function select inputs S3, S2, S1, S0 at
L, H, H, L, respectively. These circuits have been de-
signed to not only incorporate all of the designer’s re-
quirements for arithmetic operations, but also to pro-
vide 16 possible functions of two Boolean variables
without the use of external circuitry. These logic func-
tions are selected by use of the four function-select in-
puts (S0, S1, S2, S3) with the mode-control input (M)
at a high level to disable the internal carry. All inputs
are equipped with protection circuits against static dis-
charge and transient excess voltage.
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
2, 23, 21, 19
A0 to A3
Word A Inputs
1, 22, 20, 18
B0 to B3
Word B Inputs
6, 5, 4, 3
S0 to S3
Function Select Inputs
7
Cn
Inv. Carry Input
8
M
Mode Control Input
9, 10, 11, 13
F0 to F3
Function Outputs
14
A = B
Comparator Output
15
P
Carry Propagate Output
16
Cn + 4
Inv. Carry Output
17
G
Carry Generate Output
12
GND
Ground (0V)
24
VCC
Positive Supply Voltage
INPUT AND OUTPUT EQUIVALENT CIRCUITS
PIN NUMBER
2
1
23
22
21
20
19
18
9
10
11
13
7
16
15
17
ACTIVE LOW DATA (Table 1)
A0
B0
A1
B1
A2
B2
A3
B3
F0
F1
F2
F3
Cn
Cn + 4
P
G
ACTIVE HIGH DATA (Table 1)
A0
B0
A1
B1
A2
B2
A3
B3
F0
F1
F2
F3
Cn
Cn + 4
X
Y
Input Cn
Output Cn + 4
Active LOW Data (Figure 1)
Active HIGH Data (Figure 2)
HH
A
≥ BA ≤ B
HL
A < B
A > B
LH
A > B
A < B
LL
A
≤ BA ≥ B
IEC LOGIC SYMBOLS
ONLY OUTPUT A = B
M74HC181
2/13


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