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參數資料
| 型號： | HD74HC390 |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Dual Decade Counters |
| 中文描述： | 雙十年計數器 |
| 文件頁數： | 1/9頁 |
| 文件大?。?/td> | 51K |
| 代理商： | HD74HC390 |
HD74HC390
Dual Decade Counters
Description
The HD74HC390 incorporate dual decade counters, each composed of a divide-by-two and a divide-by-
five counter. The divide-by-two and divide-by-five counters can be cascaded to form dual decade, dual bi-
quinary, or various combinations up to a single divide-by-100 counter.
The HD74HC390 is incremented on the high to low transition (negative edge) of the clock input, and each
has an independent clear input. When clear is set high all four bits of each counter are set to a low level.
This enables count truncation and allows the implementation of divide-by-N counter configurations.
Features
High Speed Operation: t
pd
(Clock A to Q
A
) = 11 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 μA max
Low Quiescent Supply Current: I
CC
(static) = 4 μA max (Ta = 25°C)
Function Table
Clock
A
B
Clear
Operation
X
X
H
Clear
÷
2 and
÷
5
Increment
÷
2
Increment
÷
5
X
L
X
L
相關PDF資料 |
PDF描述 |
|---|---|
| HD74HC393 | Quad 2-Line To 1-Line Data Selectors/Multiplexers With 3-State 16-CDIP -55 to 125 |
| HD74HC4017 | Decade Counter/Divider |
| HD74HC4020 | 14-stage Binary Counter |
| HD74HC4022 | Octal Counters/Dividers |
| HD74HC4024 | 7-stage Binary Counter |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HD74HC393FP-E | 制造商:Renesas Electronics Corporation 功能描述: |
| HD74HC393P | 制造商:Renesas Electronics Corporation 功能描述:Counter/Divider Dual 4-Bit Binary UP 14-Pin PDIP |
| HD74HC393P-E | 制造商:Renesas Electronics Corporation 功能描述: |
| HD74HC4017P | 制造商:Renesas Electronics 功能描述:74HC Decade Counter / Divider Bulk |
| HD74HC4020FP | 制造商:Renesas Electronics 功能描述:74HC 14-Stage Binary Counter 制造商:Renesas Electronics 功能描述:74HC 14-Stage Binary Counter Bulk |
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