BUY DS1244Y-200 https://www.utsource.net/itm/p/367482.html
256K NV SRAM with Phantom Clock
Description: The DS1244Y-200 is a nonvolatile static RAM (NVSRAM) module from Dallas Semiconductor. It is a dual-in-line package (DIP) with a 200ns access time.
Features:
200ns access time
Nonvolatile static RAM (NVSRAM)
Dual-in-line package (DIP)
Low power CMOS technology
16K x 8 bit organization
Battery backup
Data retention up to 10 years
Low power consumption
Applications:
Automotive systems
Industrial automation
Robotics
Security systems
Medical equipment
Data acquisition systems
Embedded systems
Telecommunications
(For reference only)