參數(shù)資料
型號(hào): MC14581BCL
廠商: ON SEMICONDUCTOR
元件分類: 算術(shù)邏輯單元
英文描述: 4-BIT ARITHMETIC LOGIC UNIT, CDIP24
封裝: CERAMIC, DIP-24
文件頁(yè)數(shù): 5/7頁(yè)
文件大小: 230K
代理商: MC14581BCL
MOTOROLA CMOS LOGIC DATA
5
MC14581B
BLOCK DIAGRAM
(ACTIVE LOW)
BLOCK DIAGRAM
(ACTIVE HIGH)
2
9
A0
23
A1
21
A2
19
A3
1
B0
22
B1
20
B2
18
B3
7
Cn
8
MC
F0
WORD A
WORD B
CARRY IN
MODE CONTROL
10
F1
11
F2
13
F3
14
A = B
16
Cn+4
17
G
15
P
OUTPUT
FUNCTION
COMPARISON OUTPUT
RIPPLE CARRY OUTPUT
LOOK AHEAD
CARRY OUTPUTS
S0 S1 S2 S3
6
5
4
3
FUNCTION
SELECT
INPUTS
VDD = PIN 24
VSS = PIN 12
2
9
A0
23
A1
21
A2
19
A3
1
B0
22
B1
20
B2
18
B3
7
Cn
8
MC
F0
10
F1
11
F2
13
F3
14
A = B
16
Cn+4
17
G
15
P
S0 S1 S2 S3
6
5
4
3
TRUTH TABLE
Function Select
Inputs/Outputs Active Low
Inputs/Outputs Active High
S3
S2
S1
S0
Logic
Function
(MC = H)
Arithmetic*
Function
(MC = L, Cn = L)
Logic
Function
(MC = H)
Arithmetic*
Function
(MC = L, Cn = H)
L
A
A minus 1
A
L
H
AB
AB minus 1
A + B
L
H
L
A + B
AB minus 1
AB
A + B
L
H
Logic “1”
minus 1
Logic “0”
minus 1
L
H
L
A + B
A plus (A + B)
AB
A plus AB
L
H
L
H
B
AB plus (A + B)
B
(A + B) plus AB
L
H
L
A
B
A minus B minus 1
A
B
A minus B minus 1
L
H
A + B
AB
AB minus 1
H
L
AB
A plus (A + B)
A + B
A plus AB
H
L
H
A
B
A plus B
A
B
A plus B
H
L
H
L
B
AB plus (A + B)
B
(A + B) plus AB
H
L
H
A + B
AB
AB minus 1
H
L
Logic “0”
A plus A
Logic “1”
A plus A
H
L
H
AB
AB plus A
A + B
(A + B) plus A
H
L
AB
AB plus A
A + B
(A + B) plus A
H
A
A minus 1
* Expressed as two’s complements. For arithmetic function with Cn in the opposite state, the resulting
function is as shown plus 1.
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