M48T18 Description
10 2.3 Data retention mode . 13 2.4 Power-fail interrupt pin . 14 3.1 Reading the clock.
M48T18 Key Features
- Integrated ultra low power SRAM, real-time clock, power-fail control circuit, and battery
- BYTEWIDE™ RAM-like clock access
- BCD coded year, month, day, date, hours, minutes, and seconds
- Typical clock accuracy of ±1 minute a month, at 25 °C
- Automatic power-fail chip deselect and WRITE protection
- WRITE protect VPFD = power-fail deselect voltage)
- M48T08: VCC = 4.75 to 5.5 V; 4.5 V ≤ VPFD ≤ 4.75 V
- Software controlled clock calibration for high accuracy