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BUY DS1743-100+ https://www.utsource.net/itm/p/4368491.html
IC RTC CLK/CALENDAR PAR 28-EDIP
Description: The DS1743-100+ is a nonvolatile memory device from Maxim Integrated. It is a 1Kb (128 x 8) CMOS static RAM with a built-in lithium energy source and a real-time clock/calendar. Features: Low power CMOS static RAM Built-in lithium energy source Real-time clock/calendar Operating voltage range of 2.2V to 5.5V Operating temperature range of -40°C to +85°C Low power consumption High speed access time of 55ns Low power shutdown mode Battery backup for data retention Available in 8-pin DIP package Application: The DS1743-100+ is suitable for applications that require a real-time clock/calendar and nonvolatile memory, such as embedded systems, automotive systems, and consumer electronics. It is also suitable for applications that require low power consumption and high speed access time. (For reference only)