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New RTC from Intersil combines high-precision, low power

Posted: 13 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? isl1209? real time clock? rtc? event detect?

Intersil Corp. unveiled a new real-time clock (RTC) that combines high-precision and low power for applications that require very accurate clock and calendar functions with Event Detect.

Aside from the Event Detect, the ISL1209 also features the Time Stamp function. These two functions are important for applications requiring increased security, warranty monitoring, data collection and/or event recording. "In addition to providing accurate clock and calendar functions, our new real-time clock integrates timing and crystal compensation, flexible alarm, programmable clock output, power fail detection and intelligent battery backup switching into one space saving package," said Rouben Gharagozian, marketing director for Timing Devices at Intersil.

"The ISL1209's low 400nA current consumption at 3V and small package make it an ideal choice for portable, handheld, battery-powered equipment and microprocessor applications where space is at a premium," Gharagozian added. Target applications include electronic power meters, ATM, medical and other security related equipment and systems.

The company added that applications with high accuracy requirements will benefit from using the ISL1209, which contains circuitry for adjusting the frequency of the crystal oscillator through ATR (Analog Trimming Registers) and DTR (Digital Trimming Registers). This circuitry can be used to tune oscillator initial frequency, as well as, adjust to compensate for temperature changes. The oscillator uses an external, 32.768kHz crystal. The RTC tracks time with separate registers for hours, minutes and seconds. The device also has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction.

The IRQ/FOUT provides one of 15 different frequency output ranging from 32.768kHz down to 1/32Hz for microcontroller and other timing circuits. Users have access to 2 bytes of battery-backed SRAM that can be used for scratchpad memory. Additional features include on-chip oscillator compensation, single event or pulse interrupt mode, and automatic backup to battery or super cap. The ISL1209 also incorporates Intersil's InterSeal battery saver technology, which prevents any current drain on the battery until the unit is first powered up.

The ISL1209 is available in a 10-lead MSOP package with either standard lead finish or Pb-free. It has a suggested resale price of $1.30 in 1,000-unit quantities.

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