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參數(shù)資料
| 型號(hào)： | 74F525PCX |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Programmable Counter |
| 中文描述： | 可編程計(jì)數(shù)器 |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大?。?/td> | 184K |
| 代理商： | 74F525PCX |
Timing Diagrams
TL/F/9547–5
j
With XTR HIGH, the rising edge of CP loads data from the latches to the counter.
k
With XTR LOW, the rising edge of CP begins count-down cycle.
l
When the count reaches zero, Q goes HIGH, and Q/2 toggles state.
m
The next occurrence of XTR clears Q.
FIGURE 1. MODE 0 and MODE 1 (Inverse Output of Mode 0)
M
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e
000, 001
TL/F/9547–6
j
With XTR HIGH, the rising edge of CP loads data from the latches to the counter.
k
With XTR LOW, the rising edge of CP begins the count-down cycle.
l
When the count reaches zero, Q goes HIGH for one period of CP, and Q/2 toggles state.
FIGURE 2. MODE 2 and MODE 3 (Inverse Output of Mode 2)
M
n
e
010, 011
TL/F/9547–7
FIGURE 3. MODE 4 and MODE 5
M
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100, 101
j
With XTR HIGH, the rising edge of CP loads data from the latches into the counter.
k
With XTR LOW, the rising edge of CP begins the count-down.
l
With XTR HIGH, during count-down, the rising edge of CP does nothing.
m
When the count reaches zero, Q goes HIGH for one clock cycle and Q/2 toggles state.
Note:
Once the count reaches zero, the counter can be reloaded with XTR HIGH.
4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 74F525QCX | Programmable Counter |
| 74F676SPC | 16-Bit Serial/Parallel-In, Serial-Out Shift Register |
| 74F676SC | 16-Bit Serial/Parallel-In, Serial-Out Shift Register |
| 74F676PC | 16-Bit Serial/Parallel-In, Serial-Out Shift Register |
| 74F676SPC | 16-Bit Serial/Parallel-In, Serial-Out Shift Register |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74F525QC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Timer Circuit |
| 74F525QCX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Programmable Counter |
| 74F525SC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Timer Circuit |
| 74F525SCX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Programmable Counter |
| 74F5300 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Fiber optic LED driver |
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