| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | 74HCT4520 | Dual 4-bit synchronous binary counter | 56K |
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| 2 | 74HCT4520 | High Speed CMOS Logic Dual Synchronous Counters | 46K |
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| 3 | 74HCT4520D | Synchronous Up Counter | 120K |
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| 4 | 74HCT4520D-T | Synchronous Up Counter | 120K |
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| 5 | 74HCT4520N | Synchronous Up Counter | 120K |
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