EM3024- Real Time Clocks - IC

Very Low Power 8-Bit 32 kHz RTC with Digital Trimming, User RAM and High Level Integration - Ultra-Low Power

General Description

The A3024 is a low power CMOS real time clock. Standby current is typically 1.2 µA and the access time is 50 ns. The interface is 8 bits with multiplexed address and data bus. Multiplexing of address and data is handled by the input line  A/D. There are no busy flags in the A3024, internal time update cycles are invisible to the user’s software. Time data can be read from the A3024 in 12 or 24 hour data formats. An external signal puts the A3024 in standby mode. Even in standby, the A3024 pulls the IRQ pin active low on an internal alarm interrupt. Calendar functions include leap year correction and week number calculation. Time precision can be achieved by digital triming. The A3024 can be synchronized to an external 50 Hz signal or to the nearest second or minute.


  • Industrial controllers
  • Alarm systems with periodic wake up
  • PABX and telephone systems
  • Point of sale terminals
  • Automotive electronics


  • Digital trimming and temperature compensation facilities
  • Can be synchronized to 50 Hz or nearest s/min
  • 50 ns access time with 50 pF load capacitance
  • Standby on power down typically 1.2 µA
  • Universal interface compatible with both Intel and Motorola
  • Simple 8 bit interface with no delays or busy flags
  • 16 bytes of user RAM
  • Power fail input disables during power up / down or reset
  • Bus can be tri-state in power fail mode
  • Wide voltage range, 2.0 V to 5.5 V
  • 12 or 24 hour data formats
  • Time to 1/100 of a second
  • Leap year correction and week number calculation
  • Alarm and timer interrupts
  • Programmable interrupts: 10 ms, 100 ms, s or min
  • Sleep mode capability
  • Alarm programmable up to one month
  • Timer measures elapsed time up to 24 hours
  • Temperature range -40 to +85 °C
  • Packages DIP20 and SO20
EM3024 Data Sheet (754.18 KB)754.18 KB
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