| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | M4T28-BR12SH1 | TIMEKEEPER SNAPHAT Battery & Crystal | 52K |
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| 2 | M4T28-BR12SH1 | Serial real-time clock with 44 bytes NVRAM and reset | 354K |
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| 3 | M4T28-BR12SH1 | 3.3V, 256Kbit (32Kbit x 8) TIMEKEEPER㈢ SRAM | 256K |
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| 4 | M4T28-BR12SH1 | TIMEKEEPER SNAPHAT (BATTERY & CRYSTAL) | 176K |
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| 5 | M4T28-BR12SH1 | TIMEKEEPER? SNAPHAT? (battery and crystal) | 143K |
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| 6 | M4T28-BR12SH1 | Serial real-time clock with 44 bytes NVRAM and reset | 367K |
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| 7 | M4T28-BR12SH1TR | TIMEKEEPER SNAPHAT (BATTERY & CRYSTAL) | 176K |
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| 8 | M4T28-BR12SH1TR | TIMEKEEPER? SNAPHAT? (battery and crystal) | 143K |
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