BUY HM1-6561-9 https://www.utsource.net/itm/p/337441.html
256 x 4 CMOS RAM
Description: HM1-6561-9 is a 18-pin Ceramic Dual Inline Package (CDIP) integrated circuit (IC) manufactured by Harris Semiconductor. Features: Operating Voltage Range: 4.5V to 18V Operating Temperature Range: -55°C to +125°C Low Power Consumption High Speed Operation High Reliability Low Noise Applications: HM1-6561-9 is commonly used in automotive, industrial, and consumer applications. It can be used for power management, motor control, signal conditioning, and data acquisition. (For reference only)