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參數(shù)資料
| 型號： | MC74HC390A |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 通用總線功能 |
| 英文描述： | Dual 4-Stage Binary Ripple Counter(雙4位二進制紋波計數(shù)器) |
| 中文描述： | 雙4位的二進制紋波計數(shù)器（雙4位二進制紋波計數(shù)器） |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 127K |
| 代理商： | MC74HC390A |
MC74HC390A
http://onsemi.com
7
APPLICATIONS INFORMATION
Each half of the MC54/74HC390A has independent
÷
2
and
÷
5 sections (except for the Reset function). The
÷
2 and
÷
5 counters can be connected to give BCD or biquinary
(25) count sequences. If Output Q
A
is connected to the
Clock B input (Figure 4), a decade divider with BCD output
is obtained. The function table for the BCD count sequence
is given in Table 1.
To obtain a biquinary count sequence, the input signals
connected to the Clock B input, and output Q
D
is connected
to the Clock A input (Figure 5). Q
A
provides a 50% duty
cycle output. The biquinary count sequence function table
is given in Table 2.
Table 1. BCD Count Sequence*
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
*Q
A
connected to Clock B input.
Table 2. BiQuinary Count Sequence**
Count
Output
Q
A
Q
D
Q
C
Q
B
0
1
2
3
4
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
10
11
12
**Q
D
connected to Clock A input.
CONNECTION DIAGRAMS
1, 15
÷
2
COUNTER
CLOCK A
RESET
Figure 6. BCD Count
Figure 7. Bi-Quinary Count
÷
2
COUNTER
÷
5
COUNTER
÷
5
COUNTER
CLOCK B
CLOCK A
RESET
CLOCK B
1, 15
Q
A
Q
B
Q
C
Q
D
3, 13
5, 11
6, 10
7, 9
4, 12
2, 14
Q
A
Q
B
Q
C
Q
D
3, 13
5, 11
6, 10
7, 9
4, 12
2, 14
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| MC74HC390ADR2 | 功能描述:計數(shù)器移位寄存器 2-6V Dual 4-Stage RoHS:否 制造商:Texas Instruments 計數(shù)器類型: 計數(shù)順序:Serial to Serial/Parallel 電路數(shù)量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數(shù)量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel |
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| MC74HC390ADT | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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