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參數(shù)資料
| 型號： | SN74LS83N |
| 廠商： | Motorola, Inc. |
| 英文描述： | Sensitive Gate Silicon Controlled Rectifier; Package: TO-92 (TO-226) 5.33mm Body Height; No of Pins: 3; Container: Tape and Ammunition Box; Qty per Container: 2000 |
| 中文描述： | 4位二進(jìn)制全加器與快速進(jìn) |
| 文件頁數(shù)： | 2/3頁 |
| 文件大小： | 94K |
| 代理商： | SN74LS83N |
5-82
FAST AND LS TTL DATA
SN54/74LS83A
FUNCTIONAL DESCRIPTION
The LS83A adds two 4-bit binary words (A plus B) plus the incoming carry. The binary sum appears on the sum outputs (
∑
1–
∑
4)
and outgoing carry (C4) outputs.
C0 + (A1+B1)+2(A2+B2)+4(A3+B3)+8(A4+B4) =
∑
1+2
∑
2+4
∑
3+8
∑
4+16C4
Where: (+) = plus
Due to the symmetry of the binary add function the LS83A can be used with either all inputs and outputs active HIGH (positive
logic) or with all inputs and outputs active LOW (negative logic). Note that with active HIGH Inputs, Carry Input can not be left open,
but must be held LOW when no carry in is intended.
Example:
C0
L
A1
L
A2
H
A3
L
A4
H
B1
H
B2
L
B3
L
B4
H
∑
1
H
∑
2
H
∑
3
L
∑
4
L
C4
H
Logic Levels
Active HIGH
0
0
1
0
1
1
0
0
1
1
1
0
0
1
(10+9 = 19)
Active LOW
1
1
0
1
0
0
1
1
0
0
0
1
1
0
(carry+5+6 = 12)
Interchanging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 10, 11,
13, etc.
FUNCTIONAL TRUTH TABLE
C (n–1)
An
L
L
H
H
L
L
H
H
Bn
L
H
L
H
L
H
L
H
∑
n
L
H
H
L
H
L
L
H
Cn
L
L
L
H
L
H
H
H
L
L
L
L
H
H
H
H
C1 — C3 are generated internally
C0 — is an external input
C4 — is an output generated internally
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
TA
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°
C
IOH
IOL
Output Current — High
54, 74
–0.4
mA
Output Current — Low
54
74
4.0
8.0
mA
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