This document describes the features and characteristics of M48T129Y and M48T129V, two 1Mbit SRAM real-time clock integrated circuits, including low power consumption, BCD coded century and year, battery low warning, automatic power-fail chip deselect and write protection.
The M48T129Y/V is a 1Mbit (128K x 8) non-volatile static RAM and real-time clock device manufactured by STMicroelectronics. It features an integrated ultra-low power SRAM, real-time clock, power-fail control circuit, and a replaceable battery and crystal housed in a special DIP package. The device is Y2K compliant and offers unlimited write cycles, making it suitable for applications requiring data retention during power loss.
| Memory Size | 128Kb x 8 |
|---|---|
| Supply Voltage | 3.3V to 5.5V |
| Operating Temperature | 0 to 70 °C |
| Storage Temperature | -40 to 85 °C |
| Data Retention | 10 years |
| Power Dissipation | 1 W |
The power-fail deselect voltage (Vprp) for the M48T129Y is between 4.2V and 4.5V.
The power-fail deselect voltage (Vprp) for the M48T129V is between 2.7V and 3.0V.
Yes, the device is Year 2000 compliant with BCD coded century, year, month, day, date, hours, minutes, and seconds.