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74HCT181N Arkusz danych(PDF) 5 Page - NXP Semiconductors

Numer części 74HCT181N
Szczegółowy opis  4-bit arithmetic logic unit
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT181N Arkusz danych(HTML) 5 Page - NXP Semiconductors

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1998 Jun 10
5
Philips Semiconductors
Product specification
4-bit arithmetic logic unit
74HC/HCT181
FUNCTION TABLES
Notes to the function tables
1. Each bit is shifted to the next more significant position.
2. Arithmetic operations expressed in 2s complement
notation.
H = HIGH voltage level
L = LOW voltage level
MODE SELECT
INPUTS
ACTIVE HIGH INPUTS AND
OUTPUTS
S3
S2
S1
S0
LOGIC
(M=H)
ARITHMETIC(2)
(M=L; Cn=H)
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
H
A
A + B
AB
logical 0
A
A+B
A+ B
minus 1
L
L
L
L
H
H
H
H
L
L
H
H
L
H
L
H
AB
B
A
⊕ B
AB
A plus AB
(A + B) plus AB
A minus B minus 1
AB minus 1
H
H
H
H
L
L
L
L
L
L
H
H
L
H
L
H
A+B
A
⊕ B
B
AB
A plus AB
A plus B
(A + B) plus AB
AB minus 1
H
H
H
H
H
H
H
H
L
L
H
H
L
H
L
H
logical 1
A+ B
A+B
A
A plus A(1)
(A + B) plus A
(A + B) plus A
A minus 1
Notes to the function tables
1. Each bit is shifted to the next more significant position.
2. Arithmetic operations expressed in 2s complement
notation.
H = HIGH voltage level
L = LOW voltage level
MODE SELECT
INPUTS
ACTIVE LOW INPUTS AND
OUTPUTS
S3
S2
S1
S0
LOGIC
(M=H)
ARITHMETIC(2)
(M=L; Cn=L)
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
H
A
AB
A+ B
logical 1
A minus 1
AB minus 1
AB minus 1
minus 1
L
L
L
L
H
H
H
H
L
L
H
H
L
H
L
H
A + B
B
A
⊕ B
A+ B
A plus (A + B)
AB plus (A + B)
A minus B minus 1
A+ B
H
H
H
H
L
L
L
L
L
L
H
H
L
H
L
H
AB
A
⊕ B
B
A + B
A plus (A + B)
A plus B
AB plus (A + B)
A+B
H
H
H
H
H
H
H
H
L
L
H
H
L
H
L
H
logical 0
AB
AB
A
A plus A(1)
AB plus A
AB plus A
A


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