V3023 Datasheet | EM Microelectronic

Description The V3023 is a low power CMOS real time clock with a built in crystal. 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 V3023, internal time update cycles are invisible to the user's software. Time data can be read from the V3023 in 12 or 24 hour data formats. An external signal puts the V3023 in standby mode. Even in standby, the V3023 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 trimming. The V3023 can be synchronized to an external 50 Hz signal or to the nearest second or minute. Applications  Industrial controllers  Alarm systems with periodic wake up  PABX and telephone systems  Point of sale terminals  Automotive electronics Features  Built-in crystal with digital trimming and temperature pensation facilities  Can be synchronised to 50 Hz or nearest s/min  50 ns access time with 50 p F load capacitance  Standby on power down typically 1.2 µA  Universal interface patible 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 of reset  Bus can be in 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°C to +85°C  Package SO28 Typical Operating Configuration Pin Assignment SO28 SYNC PF AD0 AD1 NC AD2 AD3 A/D IRQ VSS VSS VSS VSS VSS NC AD7 AD6 AD5 NC AD4 RD WR CS VDD VDD VDD VDD VDD Fig....