| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
|---|
| 1 | HD74LS490P | Asynchronous Up Counter | 265K |
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| 2 | HD74LS490P | BCD-to-Seven Segment Decoder Driver(with Open collector outputs) | 71K |
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| 3 | HD74LS490P(DIP) | BCD-to-Seven Segment Decoder Driver(with Open collector outputs) | 68K |
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