M48T251V-85PM1

The M48T248V-85PM1 is a 512Kbit 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. In the event of power instability or absence, a self-contained battery maintains the timekeeping operation and provides power for a CMOS static RAM. Control circuitry monitors VCC and invokes write protection to prevent data corruption in the memory and RTC.

The features of the M48T248V-85PM1 are: (1)5.0V or 3.3V operating voltage; (2)real time clock keeps track of tenths/hundredths of seconds, seconds, minutes, hours, days, date of the month, months, and years; (3)automatic leap year correction valid up to the year 2100; (4)automatic switch-over and deselect circuitry; (5)choice of power-fail deselect voltages: (VPFD = ; (6)FULL 10% VCC operating range; (7)over 10 years' data retention in the absence of power; (8)watch function is transparent to ram operation; (9)512K x 8 NV SRAM directly replaces volatile static RAM or EEPROM.

The absolute maximum ratings of the M48T248V-85PM1 are: (1)Operating Temperature: 0 to 70 °C; (2)Storage Temperature (VCC, Oscillator Off): 40 to 85 °C; (3)Lead Solder Temperature for 10 seconds: 260 °C; (4)Supply Voltage (on any pin relative to Ground): 0.3 to +4.6 V; (5)Input or Output Voltages: 0.3 to VCC + 0.3 V; (6)Output Current: 20 mA; (7)Power Dissipation: 1 W.