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Intersil claims 'most' accurate real-time clocks

Posted: 26 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:accurate real time clocks? AC power line?


Intersil Corp. has introduced the world's first full-featured, AC-driven real-time clock (RTC) devices. The ICs can be designed into a wide range of industrial and consumer products, from power meters and security devices to white goods and other high-end appliances that require precise measurement of time. With integrated functionality such as dual alarms, event detection and a "brownout" alert, the ISL12030 and ISL12032 devices have the broadest feature set of any RTCs on the market.

Traditionally, RTCs have used an external crystal for timekeeping, and over long periods of time, some crystal-based solutions can accumulate significant errors. The 50/60Hz AC power ubiquitous to the U.S. and Europe is a new and more efficient method of providing RTCs with a clock source. By using the AC power line for timekeeping, designers can build devices that perform more accurately and reliably over the long-term and better withstand extreme temperature changes.

Intersil's AC-driven RTCs feature automatic crystal oscillator backup in case the AC line frequency is lost (ISL12032). The devices also offer an integrated trickle charger that allows a rechargeable energy source such as a super capacitor or rechargeable battery to be used as a backup supply. It integrates dual alarms for reporting problems with system performance as well as a power status "brownout" alarm that allows the system to save vital information to memory before a complete power loss occurs. The time stamp feature records the time and date of events including power loss, recovery and tampering, a feature particularly important in metering devices. Finally, the devices also offer a battery status monitor that provides warning if battery voltage drops below a certain threshold.

The ISL12030 is available now in an 8-lead SOIC and is priced at $1.82 each 1,000-unit quantities. The ISL12032 is available now in a 14-lead TSSOP and is priced at $2.06 each in 1,000-unit quantities.

Intersil is one of the exhibitors in the upcoming IIC-China 2008.

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