The Renesas Electronics ISL12057 device is a low-power, real-time clock that is pin compatible and functionally equivalent to Maxim DS1337 with clock/calendar and alarm function. The oscillator uses an external, low-cost 32.768kHz crystal with 6pF load capacitance. The device has calendar registers for date, month, year, and day of the week. The calendar is accurate through 2099, with automatic leap year correction.

Four Selectable Frequency Outputs
Two alarms
400kHz data transfer rate
Small package options