M48T58 M48T58Y is a product that integrates ultra-low power SRAM, real-time clock, power-fail control circuit, and battery. It features byte-wide RAM-like clock access, BCD-coded year, month, day, date, hours, minutes, and seconds, frequency test output for real-time clock, and automatic power-fail chip deselect and write protection.
The M48T58/Y TIMEKEEPER® SRAM combines 8 Kb × 8 static RAM with a real‑time clock and a built‑in battery and crystal in a single package. It is pin‑compatible with JEDEC standard 8 Kb × 8 SRAMs and can be used in ROM, EPROM or EEPROM sockets, providing non‑volatile storage without special write timing.
Key features include ultra‑low power operation, automatic power‑fail detection with write protection, BCD‑coded date and time registers, and a frequency‑test output for clock verification. The device is offered in a 28‑pin DIP CAPHAT™ package with an optional SNAPHAT battery/ crystal module, as well as a 28‑lead SOIC package that mates with a separate SNAPHAT housing.
| Memory size | 8 Kb × 8 |
|---|---|
| Supply voltage (M48T58) | 4.75 V to 5.5 V |
| Operating temperature range | 0 °C to 70 °C |
| Read cycle time | 70 ns |
| Address‑to‑output valid time | 70 ns |
The M48T58 operates with a Vcc of 4.75 V to 5.5 V.
The read cycle time is specified as 70 ns.