CF5059H RTC offers low power (type 50uA current) and wide temperature range operation from -40 to 125C with excellent stability using AT-cut crystal oscillating at 16.777216 and divided down by 512 to 32.768kHz, or alternatively with 33.554432MHz divided by 1024 to 32.768kHz. Three layout versions span packages from 5x7mm to 1.6 x 2.0mm.