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參數(shù)資料
| 型號(hào)： | 74LS90 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Decade and Binary Counters |
| 中文描述： | 十年和二進(jìn)制計(jì)數(shù)器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 131K |
| 代理商： | 74LS90 |
Function Tables
LS90
BCD Count Sequence
(See Note A)
Count
Output
Q
D
Q
C
Q
B
Q
A
0
1
2
3
4
5
6
7
8
9
L
L
L
L
L
L
L
L
H
H
L
L
L
L
H
H
H
H
L
L
L
L
H
H
L
L
H
H
L
L
L
H
L
H
L
H
L
H
L
H
LS90
Bi-Quinary (5-2)
(See Note B)
Count
Output
Q
A
Q
D
Q
C
Q
B
0
1
2
3
4
5
6
7
8
9
L
L
L
L
L
H
H
H
H
H
L
L
L
L
H
L
L
L
L
H
L
L
H
H
L
L
L
H
H
L
L
H
L
H
L
L
H
L
H
L
LS93
Count Sequence
(See Note C)
Count
Output
Q
D
Q
C
Q
B
Q
A
0
1
2
3
4
5
6
7
8
9
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
10
11
12
13
14
15
Note A:
Output Q
A
is connected to input B for BCD count.
Note B:
Output Q
D
is connected to input A for bi-quinary count.
Note C:
Output Q
A
is connected to input B.
Note D:
H
e
High Level, L
e
Low Level, X
e
Don’t Care.
LS90
Reset/Count Truth Table
Reset Inputs
Output
R0(1)
R0(2)
R9(1)
R9(2)
Q
D
Q
C
Q
B
Q
A
H
H
X
X
L
L
X
H
H
X
L
X
X
L
L
X
H
X
L
X
L
X
L
H
L
X
L
X
L
L
H
L
L
L
COUNT
COUNT
COUNT
COUNT
L
L
L
L
L
H
LS93
Reset/Count Truth Table
Reset Inputs
Output
R0(1)
R0(2)
Q
D
Q
C
Q
B
Q
A
H
L
X
H
X
L
L
L
L
L
COUNT
COUNT
6
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PDF描述 |
|---|---|
| 74LS90 | DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER |
| 74LS90 | Decade and Binary Counters |
| 74LS | SYNCHRONOUS 4-BIT UP/DOWN COUNTER |
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| 74LVT16652 | 3.3V ABT 16-Bit Transceiver/Register with TRI-STATE Outputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74LS90 WAF | 制造商:Texas Instruments 功能描述: |
| 74LS90N | 制造商: 功能描述: 制造商:undefined 功能描述: 制造商:NXP Semiconductors 功能描述:Counter, Up, Decade, 14 Pin, Plastic, DIP |
| 74LS90PC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 74LS91 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:8-BIT SHIFT REGISTERS |
| 74LS92 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER |
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