| 型号 | 厂家 | 描述 | 大小 | 页数 | 厂家标志 |
|---|---|---|---|---|---|
| M4T28-BR12SH1 | STMicroelectronics | Serial real-time clock with 44 bytes NVRAM and reset | 358 KB | 41 |  |
| M4T32-BR12SH1 | STMicroelectronics | TIMEKEEPER? SNAPHAT? (battery and crystal) | 139 KB | 16 | |
| M4T32-BR12SH6 | STMicroelectronics | TIMEKEEPER? SNAPHAT? (battery and crystal) | 139 KB | 16 | |
| M4T28BR12SH1 | STMicroelectronics | TIMEKEEPER? SNAPHAT? (battery and crystal) | 139 KB | 16 | |
| M4T32BR12SH1 | STMicroelectronics | TIMEKEEPER? SNAPHAT? (battery and crystal) | 139 KB | 16 | |
| M4T32BR12SH6 | STMicroelectronics | TIMEKEEPER? SNAPHAT? (battery and crystal) | 139 KB | 16 | |
| M4T28-BR12SH6 | STMicroelectronics | TIMEKEEPER? SNAPHAT? (battery and crystal) | 139 KB | 16 | |
| M4T28-Br12SH | STMicroelectronics | 5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR | 530 KB | 34 | |
