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BUY DS1230AB-200 https://www.utsource.net/itm/p/319057.html
256K Nonvolatile SRAM
Description: The DS1230AB-200 is a nonvolatile static RAM (NVSRAM) from Dallas Semiconductor. It is a 28-pin DIP package with a capacity of 256K bits. Features: 256K bits of nonvolatile static RAM Low power CMOS technology Battery-backed write protection Automatic write protection when VCC falls below 2.0V Automatic write protection when battery voltage falls below 2.2V Automatic write protection when battery voltage falls below 1.8V Automatic write protection when battery voltage falls below 1.4V Data retention for 10 years Access time: 55ns Operating temperature range: -40°C to +85°C Applications: Automotive systems Industrial control systems Medical equipment Portable electronics Security systems Telecommunications systems (For reference only)