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.

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)