The DP8573A is intended for use in microprocessor based systems where information is required for multi-tasking, data logging or general time of day/date information. This device is implemented in low voltage silicon gate microCMOS technology to provide low standby power in battery back-up environments. Time and date are maintained from 1/100 of a second to year and leap year in a BCD format, 12 or 24 hour modes. Day of week and day of month counters are provided. Time is controlled by an on-chip crystal oscillator requiring only the addition of the 32.768 kHz crystal and two capacitors.

Features

• Full function real time clock/calendar
• 12/24 hour mode timekeeping
• Day of week counter
• Parallel resonant oscillator
• Power fail features
• Internal power supply switch to external battery
• Power Supply Bus glitch protection
• Automatic log of time into RAM at power failure
• On-chip interrupt structure
• Periodic, alarm, and power fail interrupts