The document describes the features and characteristics of the M48T58 and M48T58Y products, including integrated ultra low-power SRAM, real-time clock, power-fail control circuit, and battery. It also includes BCD coded year, month, day, date, hours, minutes, and seconds, frequency test output for real-time clock, automatic power-fail chip deselect and WRITE protection, WRITE protect voltages, self-contained battery and crystal in the CAPHAT™ DIP package, packaging options, and pin and function compatibility with JEDEC standard 8 Kb x 8 SRAMs.
The M48T58/M48T58Y is a non-volatile static RAM and real-time clock integrated on a single silicon chip. It is available in a 28-pin CAPHAT DIP package containing the silicon, quartz crystal, and lithium battery, or as a 28-lead SOIC package with separate SNAPHAT housing for the battery and crystal. The device provides BYTEWIDE clock access and is pin and function compatible with JEDEC standard 8 Kb x 8 SRAMs.
| Capacity | 64 Kbit (8 Kb x 8) |
|---|---|
| Supply Voltage | 4.75 to 5.5 V |
| Operating Temperature | 0 to 70 °C |
| Package Type | 28-pin CAPHAT DIP or 28-lead SOIC |
| Clock Frequency | 32,768 Hz |
The M48T58 operates with a supply voltage (VCC) of 4.75 to 5.5 V.
The device includes an automatic power-fail chip deselect and write protection circuit that activates when VCC falls below the battery backup switchover voltage.
Yes, it is a non-volatile pin and function equivalent to any JEDEC standard 8 Kb x 8 SRAM.