MM58274C

Same pin-out as MM58174A, MM58274B, and MM58274
 Timekeeping from tenths of seconds to tens of years in independently accessible registers
 Leap year register
Hours counter programmable for 12 or 24-hour operation
 Buffered crystal frequency output in test mode for easy oscillator setting
 Data-changed flag allows simple testing for time rollover
 Independent interrupting time with open drain output
Fully TTL compatible
 Low power standby operation (10 mA at 2.2V)
 Low cost 16-pin DIP and 20-pin PCC

Point of sale terminals
Teller terminals
 Word processors
 Data logging
 Industrial process control

The MM58274C is fabricated using low threshold metal gate CMOS technology and is designed to operate in bus oriented microprocessor systems where a real time clock and calendar function are required. The on-chip 32.768 kHz crystal controlled oscillator will maintain timekeeping down to 2.2V to allow low power standby battery operation. This MM58274C is pin compatible with the MM58174A but continues timekeeping up to tens of years. The MM58274C is a direct replacement for the MM58274 offering improved Bus access cycle times.