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MSM58321 - REAL TIME CLOCK/CALENDAR

General Description

The MSM 58321 is a metal gate CMOS Real Time Clock/Calendar with a battery backup function for use in bus-oriented microprocessor applications.

The 4-bit bidirectional bus line method is used for the data I/O circuit; the clock is set, corrected, or read by accessing the memory.

Key Features

  • 7 Function-Second, Minute, Hour, Day, Day-of-Week, Month, Year.
  • Automatic leap year calender.
  • 12/24 hour format.
  • Frequency divider 5-poststage reset.
  • Reference signal output.
  • 32.768 kHz crystal controlled operation Single 5V power supply Back-up battery operation to VDD = 2.2V Low power dissipation 90 µW max. at VDD = 3V 2.5 mW max. at VDD = 5V.
  • 16 pin plastic DIP (DIP 16-P-300).

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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¡ Semiconductor MSM58321 ¡ Semiconductor REAL TIME CLOCK/CALENDAR DESCRIPTION The MSM 58321 is a metal gate CMOS Real Time Clock/Calendar with a battery backup function for use in bus-oriented microprocessor applications. The 4-bit bidirectional bus line method is used for the data I/O circuit; the clock is set, corrected, or read by accessing the memory. MSM58321 The time is read with 4-bit DATA I/O, ADDRESS WRITE, READ, and BUSY; it is written with 4-bit DATA I/O, ADDRESS WRITE, WRITE, and BUSY. FEATURES • 7 Function-Second, Minute, Hour, Day, Day-of-Week, Month, Year • Automatic leap year calender • 12/24 hour format • Frequency divider 5-poststage reset • Reference signal output • • • • 32.