ISL12008 I2 C Real Time Clock with Battery Backup Low Power RTC with Battery ReSeal Function 2.7 to 5.5 1.8 to 5.5 800 1 Y 1 N N Y Y FOUT N -94 to +140 1.05 8 Ld SOIC 8 Ld SOIC T+R ISL12082 I2 C-Bus Real Time Clock with Two Interrupts, Alarm, and Timer Low Power RTC with Battery ReSeal, 2 IRQs, Hundredths of a Second Time, and Crystal Compensation 2.7 to 5.5 1.8 to 5.5 800 1 Y 4 N N Y Y IRQ1/fOUT , IRQ2 IRQ1/fOUT N -94 to +140 N Alarm Timer 1.15 8 Ld SOIC 8 Ld SOIC T+R 10 Ld MSOP 10 Ld MSOP T+R ISL1218 Low Power RTC with Battery Backed SRAM 2.7 to 5.5 1.8 to 5.5 400 1 Y 15 N N Y Y IRQ_bar/FOUT IRQ_bar/FOUT N -94 to +140 8 Bytes 1.27 8 Ld MSOP 8 Ld MSOP T+R 8 Ld SOIC 8 Ld SOIC T+R ISL1219 Low Power RTC with Battery Backed SRAM and Event Detection 2.7 to 5.5 1.8 to 5.5 400 1 Y 15 N N Y Y IRQ_bar/FOUT IRQ_bar/FOUT N -94 to +140 2 Bytes Event Detect Time Stamp 1.32 10 Ld MSOP 10 Ld MSOP T+R ISL1220 Low Power RTC with 8 Bytes of Battery Backed SRAM and Separate FOUT 2.7 to 5.5 1.8 to 5.5 400 1 Y 15 N N Y Y IRQ_bar FOUT N -94 to +140 8 Bytes 1.14 10 Ld MSOP 10 Ld MSOP T+R ISL1221 Low Power RTC with Battery Backed SRAM and Event Detection 2.7 to 5.5 1.8 to 5.5 400 1 Y 15 N N Y Y IRQ_bar/EVDET_bar FOUT N -94 to +140 2 Bytes Event Detect Time Stamp 1.40 10 Ld MSOP 10 Ld MSOP T+R