| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
|---|
| 1 | DM54LS491 | 10-Bit Counter | 140K |
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| 2 | DM54LS491 | 10-Bit Counter | 140K |
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| 3 | DM54LS491AJ | Synchronous Up/Down Counter | 85K |
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| 4 | DM54LS491J | 10-Bit Counter | 140K |
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| 5 | DM54LS491J | 10-Bit Counter | 140K |
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| 6 | DM54LS491J/883 | Synchronous Up/Down Counter | 85K |
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