| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN54LS668 | SYNCHRONOUS 4-BIT UP/DOWN COUNTERS | 493K |
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| 2 | SN54LS668FK | SYNCHRONOUS 4-BIT UP/DOWN COUNTERS | 493K |
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| 3 | SN54LS668J | SYNCHRONOUS 4-BIT UP/DOWN COUNTERS | 493K |
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| 4 | SN54LS668W | SYNCHRONOUS 4-BIT UP/DOWN COUNTERS | 493K |
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