| Short name | Description | Year | Manufacturer | Runnable | Parent |
|---|---|---|---|---|---|
| m48t02 | M48T02 Timekeeper | No | |||
| m48t35 | M48T35 Timekeeper | No | |||
| m48t37 | M48T37 Timekeeper | No | |||
| m48t58 | M48T58 Timekeeper | No | |||
| mk48t08 | MK48T08 Timekeeper | No | |||
| mk48t12 | MK48T12 Timekeeper | No | |||
| ds1643 | DS1643 Nonvolatile Timekeeping RAM | No |