M48T254V is a 3.3V, 16 Mbit (2 Mb x 8 bit) TIMEKEEPER® SRAM WITH PHANTOM CLOCK with the following features: 3.3V ± 10%, integrated ultra-low power SRAM, real-time clock, power-fail control circuit, battery and crystal, the real-time clock keeps track of tenths / hundredths of seconds, seconds, minutes, hours, days, date, months, and years. The clock function is transparent to RAM operation. Precision power monitoring and power switching circuitry, automatic write-protection when VCC is out-of-tolerance, power-fail deselect voltage: VCC = 3.3V ± 10%; 2.8V ≤ VPFD ≤ 2.97V, battery low (BL), 10 years of data retention and battery operation, SNAPHAT housing (battery/crystal) is replaceable, 100ns access (read = write).
The document describes the M48T254V TIMEKEEPER® RAM, which is a 2Mbit x 8 non-volatile static RAM and real time clock organized as 2,097,152 words by 8 bits. The device features an integrated ultra low power SRAM, real time clock, power-fail control circuitry, battery, and crystal within a single 168-ball PBGA module.
The datasheet provides detailed specifications including absolute maximum ratings, DC and AC parameters, operating modes for memory read/write cycles, phantom clock operation details, register maps, and mechanical package information. It also outlines the part numbering system and revision history.
| Memory Capacity | 16 Mbit (2 Mb x 8 bit) |
|---|---|
| Operating Voltage | 3.0 to 3.6 V |
| Access Time | 100 ns |
| Data Retention | 10 years |
| Operating Temperature | 0 to 70 °C |
It is organized as 2,097,152 words by 8 bits.
No, the clock function is transparent to RAM operation.