The M48T248Y M48T248V 5.0 or 3.3V, 1024K TIMEKEEPER® SRAM with PHANTOM is a real-time clock RAM chip produced by Microchip.
The document describes the M48T248Y and M48T248V Timekeeper SRAM devices from STMicroelectronics. These are 128K x 8 non-volatile static RAM modules that integrate a real-time clock (RTC) and a self-contained battery backup within a single 32-pin DIP package.
The device maintains timekeeping operation even during power instability or absence, tracking seconds down to tenths/hundredths of a second. It features automatic leap year correction valid up to the year 2100 and offers two operating voltage options: M48T248Y for 5.0V systems and M48T248V for 3.3V systems.
| Memory Size | 128K x 8 bits |
|---|---|
| Operating Voltage (M48T248Y) | 5.0V |
| Operating Voltage (M48T248V) | 3.3V |
| Package Type | 32-pin DIP |
| Operating Temperature Range | 0 to 70 °C |
| Data Retention (No Power) | Over 10 years |
The power-fail deselect voltage (VpFD) for M48T248Y is between 4.25V and 4.50V.
The power-fail deselect voltage (VpFD) for M48T248V is between 2.80V and 2.97V.
Yes, the device includes automatic leap year correction valid up to the year 2100.