SN74LS181 データシートの表示（PDF） - Motorola => Freescale
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SN74LS181 Datasheet PDF : 9 Pages
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SN54 / 74LS181
FUNCTION TABLE
MODE SELECT
INPUTS
ACTIVE LOW INPUTS
& OUTPUTS
S3 S2 S1 S0
LOGIC
(M = H)
ARITHMETIC**
(M = L) (Cn = L)
L L L LA
A minus 1
L L L H AB
AB minus 1
L L H L A+B
AB minus 1
L L H H Logical 1 minus 1
L H L L A+B
A plus (A + B)
L H L HB
AB plus (A + B)
L H H L A⊕B
A minus B minus 1
L H H H A+B
A+B
H L L L AB
A plus (A + B)
H L L H A⊕B
A plus B
H L H LB
AB plus (A + B)
H L H H A+B
A+B
H H L L Logical 0 A plus A*
H H L H AB
AB plus A
H H H L AB
AB plus A
H H H HA
A
L = LOW Voltage Level
H = HIGH Voltage Level
**Each bit is shifted to the next more significant position
**Arithmetic operations expressed in 2s complement notation
ACTIVE HIGH INPUTS
& OUTPUTS
LOGIC
(M = H)
ARITHMETIC**
(M = L) (Cn = H)
A
A
A+B
A+B
AB
A+B
Logical 0 minus 1
AB
A plus AB
B
(A + B) plus AB
A ⊕B
A minus B minus 1
AB
AB minus 1
A+B
A plus AB
A ⊕B
A plus B
B
(A + B) plus AB
AB
AB minus 1
Logical 1 A plus A*
A+B
(A + B) plus A
A+B
(A + B) Plus A
A
A minus 1
LOGIC SYMBOLS
ACTIVE LOW OPERANDS
2 1 23 22 21 20 19 18
A0 B0 A1 B1 A2 B2 A3 B3
7
Cn
Cn+4
16
8
M
LS181
A=B
14
6
S0 4 BIT ARITHMETIC G
17
5
S1
4
S2
LOGIC UNIT
P
15
3
S3 F0
F1
F2
F3
9
10
11
13
ACTIVE HIGH OPERANDS
2 1 23 22 21 20 19 18
A0 B0 A1 B1 A2 B2 A3 B3
7
Cn
Cn+4
16
8
M
LS181
A=B
14
6
S0 4 BIT ARITHMETIC G
17
5
S1
4
S2
LOGIC UNIT
P
15
3
S3 F0
F1
F2
F3
9
10
11
13
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
IOH
Output Current — High
IOL
Output Current — Low
VOH
Output Voltage — High (A = B only)
Min
Typ
Max
Unit
54
4.5
5.0
5.5
V
74
4.75
5.0
5.25
54
– 55
25
125
°C
74
0
25
70
54, 74
– 0.4
mA
54
4.0
mA
74
8.0
54, 74
5.5
V
FAST AND LS TTL DATA
5-334
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