| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN54LS691 | SYNCHRONOUS COUNTERS WITH OUTPUT REGISTERS AND MULTIPLEXED 3-STATE OUTPUTS | 545K |
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| 2 | SN54LS691FK | SYNCHRONOUS COUNTERS WITH OUTPUT REGISTERS AND MULTIPLEXED 3-STATE OUTPUTS | 545K |
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| 3 | SN54LS691J | SYNCHRONOUS COUNTERS WITH OUTPUT REGISTERS AND MULTIPLEXED 3-STATE OUTPUTS | 545K |
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