Drop-in replacement for IBM AT computer clock/calendar Pin compatible with the MC146818B and DS1287 www.DataSheet4U.com Totally nonvolatile with over 10 years of operatio.
AD0-AD7 - Multiplexed Address/Data Bus NC - No Connect MOT - Bus Type Selection CS - RTC Chip Select Input AS - Address Strobe - Read/Write Input R/ W DS - Data Strobe RESET - Reset Input IRQ - Interrupt Request Output SQW - Square Wave Output VCC - .
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