M48T02 M48T12 5.0 V, 16 Kbit (2 Kb x 8) TIMEKEEPER® SRAM is a low power real-time clock chip from ST company. It features BCD coded year, month, day, date, hours, minutes and seconds. The typical clock accuracy is ±1 minute/month at 25°C and supports software controlled clock calibration and automatic power-fail chip deselect and write protection.
The M48T02 and M48T12 are 5.0V, 16 Kbit (2 Kb x 8) Timekeeper SRAMs that integrate a real-time clock and power-fail control circuit. These devices are housed in a special 24-pin CAPHAT DIP package containing a quartz crystal and a long-life lithium button cell, providing non-volatile data retention for at least 10 years without power.
The devices are pin and function compatible with JEDEC standard 2 K x 8 SRAMs and the DS1642. They feature a BCD-coded clock that automatically handles leap years and varying month lengths, with typical accuracy of +1 minute per month at 25°C. The integrated power-fail circuit automatically switches to the internal battery when the supply voltage drops below a specific threshold to protect data integrity.
| Memory Size | 16 Kbit (2 Kb x 8) |
|---|---|
| Supply Voltage | 5.0 V |
| Clock Accuracy | +1 minute a month at 25 °C |
| Data Retention Time | at least 10 years |
| Package Type | 24-pin plastic DIP CAPHAT |
| Operating Temperature | 0 to 70 °C |
The typical clock accuracy is +1 minute per month at 25 °C.
The internal battery maintains data and clock functionality for at least 10 years in the absence of power.
Yes, it is pin and function compatible with JEDEC standard 2 K x 8 SRAMs.