Date: 11/09/2006

Intersil has improved accuracy of RTCs by compensating drift in time with temperature

New ISL1218/1220 Real Time Clocks are compensated for frequency drift with temperature. The designers can trim the oscillator frequency by adjusting integrated analog and digital timing registers to calibrate digital capacitors and timing counter. Here the basic advantage is not to bother much about the quality of the crystal. Designer can use lower cost 32.768kHz quartz crystal.

The key features are,

Power Failure detection
Intelligent battery backup switching
has a separate FOUT pin to allow clocking of the micro through RTC while having a separate alarm pin
8 bytes of battery backed SRAM
Package: ISL1218: 8 pin SOIC and MSOP
ISL1220: 10 lead MSOP
Easy pin to pin replacement for ST M41Txx and Maxim DS13xx devices

Availability: Now
Price: ISL1218: $1.27 in 1000K quantities
ISL1220: $1.14 in 1000K quantities

Support tools: Evaluation board available