The M48T512Y/V TIMEKEEPER RAM is a 512Kb x 8 non-volatile static RAM and real time clock organized as 524,288 words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock solution.
The M48T512Y/V combines a 512 Kb ×8 static RAM with a BCD‑coded real‑time clock, a lithium button cell and a 32.768 kHz crystal, all housed in a 32‑pin DIP module. It provides unlimited write cycles, automatic power‑fail detection, and write‑protect circuitry to safeguard data when supply voltage drops.
The device operates from a wide supply range, includes built‑in battery backup for up to ten years of data retention, and offers programmable clock calibration via five control bits. Detailed electrical characteristics, timing diagrams, and package dimensions are provided for system designers.
| Supply Voltage (M48T512Y) | 0.3 V to 7.0 V |
|---|---|
| Power Dissipation | 1 W |
| Data Retention (battery backup) | 10 years at room temperature |
| Clock Frequency | 32.768 kHz |
| Package Type | 32‑pin 600 mil DIP Hybrid |
| Read Cycle Time | 70 ns – 85 ns |
| Write Cycle Time | 70 ns – 85 ns |
The M48T512Y operates from 0.3 V up to 7.0 V.
The battery backup can retain data for up to ten years at room temperature.