| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN74LS490 | DUAL 4-BIT DECADE COUNTERS | 144K |
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| 2 | SN74LS490 | DUAL 4-BIT DECADE COUNTERS | 594K |
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| 3 | SN74LS490D | DUAL DECADE COUNTER | 165K |
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| 4 | SN74LS490N | DUAL DECADE COUNTER | 165K |
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