The RTC-8583/8593 series is an IC-Bus compatible RTC real-time clock module with an internal crystal oscillator, no external adjustment, small package (SOP 14-pin), supports three working modes: internal crystal oscillation, external 50Hz clock and event counter. 2C-Bus interface compatible, built-in 240 x 8 bit S-RAM (RTC8583), support alarm and timer functions, wide operating voltage range (2.5V to 6.0V), wide data hold voltage range (1.0V to 6.0V), low power consumption (RTC8593, 1.0µA typical).