This document provides information on a new product, M48T212A, which is a 3.3V timekeeper controller that converts low power SRAM into NVRAM. The product is year 2000 compliant and can be powered by a super capacitor or lithium battery. It features a battery low flag, integrated real time clock, power-fail control circuit, automatic power-fail chip deselect and write protection, watchdog timer, and programmable alarm output.
The M48T212A is a self-contained Timekeeper Controller designed to convert low-power SRAM into non-volatile memory (NVRAM). It features an integrated real-time clock (RTC) with a 32.768 kHz oscillator, programmable alarms, and a watchdog timer. The device supports Year 2000 compliance and can be powered by a super capacitor or lithium battery.
| Ambient Operating Temperature | 0 to 70 °C |
|---|---|
| Storage Temperature | -55 to 125 °C |
| Output Current | 20 mA |
| Power Dissipation | 1 W |
| Supply Current (Standby) TTL | 3 mA |
| Supply Current (Standby) CMOS | 0.2 mA |
| Battery Current (OSC ON) | 575 nA |
| Battery Current (OSC OFF) | 100 nA |
| Read Cycle Time | 85 ns |
| Write Cycle Time | 85 ns |
The device uses a super capacitor or a lithium battery supplied by the user.
Yes, the device is Year 2000 compliant with a 4-digit year feature.
The power-fail deselect voltage (VPFD) ranges from 2.7V to 3.0V.