| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | RTC-72421 | Real time clock module(4-bit REAL TIME CLOCK MODULE) | 217K |
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| 2 | RTC-72421 | Real time clock module(4-bit REAL TIME CLOCK MODULE) | 1307K |
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| 3 | RTC-72421 | 4-bit REAL TIME CLOCK MODULE | 294K |
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| 4 | RTC-72421A | Real-Time Clock | 430K |
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| 5 | RTC-72421B | Real-Time Clock | 430K |
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