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BUY M48T58Y-70PC1 https://www.utsource.net/itm/p/1258463.html
5.0V, 64 Kbit 8 Kb x 8 TIMEKEEPER SRAM
Description: M48T58Y-70PC1 is an 8K x 8 Timekeeper SRAM manufactured by ST. Features: 8K x 8 Non-volatile timekeeper SRAM Data Retention: > 200 years Low power CMOS technology Low standby current Automatic Power Fail Detection System reset on power failure Write protection of Data and Clock Real Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month and Year with Leap year compensation valid up to 2100 I2C/SMBus compatible Interface Industrial Temperature Range: -40 to +85°C Package: DIP-28 Application: M48T58Y-70PC1 is used for real time clock/calendar circuits, remote control systems, alarm systems, data acquisition systems, etc. (For reference only)