M440T1MV

The M440T1MV TIMEKEEPER^® RAM is a 16Mbit, non-volatile static RAM organized as 1,024K by 32 bits and real time clock organized as 64 bytes by 8 bits. The special PBGA 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 V_CC and invokes write protection to prevent data corruption in the memory and RTC.

The clock keeps track of tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, and year information. The last day of the month is automatically adjusted for months with less than 31 days, including leap year correction.

The clock operates in one of two formats:
a 12-hour mode with an AM/PM indicator; or
a 24-hour mode

The M440T1MV is in a 168-ball PBGA module that integrates the RTC, the battery, and SRAM in one package.