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DP8573A - Real Time Clock (RTC)

Description

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 environment

Features

  • Y Y Y 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 Block Diagram TL F 9981.
  • 1 FIGURE 1 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Co.

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DP8573A Real Time Clock (RTC) May 1993 DP8573A Real Time Clock (RTC) General Description 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 The circuit’s architecture is such that it looks like a contiguous block of memory or I O ports organized as one block of 32 bytes This includes the Control Registers the Clock Counters the Alarm Compare RAM and the Time Save RAM 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 controll
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