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MM58274C-12 Datasheet Microprocessor Compatible Real Time Clock

Manufacturer: National Semiconductor (now Texas Instruments)

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General Description

The MM58274C-12 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 device is pin compatible with the MM58174A but continues timekeeping up to tens of years Applications Y Point of sale terminals Y Teller terminals Y Word processors Y Data logging Y Industrial process control

Overview

MM58274C-12 Microprocessor Compatible Real Time Clock September 1990 MM58274C-12 Microprocessor Compatible Real Time Clock.

Key Features

  • Y Same pin-out as MM58174A MM58274B MM58274C and MM58274 Y Timekeeping from tenths of seconds to tens of years in independently accessible registers Y Leap year register Y 12 hour operation only Y Buffered crystal frequency output in test mode for easy oscillator setting Y Data-changed flag.

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