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BUY M41T81SM6F https://www.utsource.net/itm/p/4836499.html
Serial Access Real-Time Clock with Alarms
Description: Real-Time Clock (RTC) with integrated SRAM Features: Low power consumption I2C-bus interface Programmable clock output Programmable alarm Programmable timer Battery switchover Automatic power-fail detect and switch Automatic power-on reset SRAM: 256 x 8-bit Operating temperature range: -40°C to +85°C Applications: Automotive Industrial Consumer Networking Telecommunications (For reference only)