RS5C348A

The RS5C348A are COMS real-time clock ICs connected to the CPU by four signal lines CE SCLK,SI,and SO and configured to perform serial transmission of time and calendar data to the CPU.

Features of the RS5C348A are:(1)timekeeping supply voltage ranging from 1.45 to 5.5 volts;(2)low supply current;(3)only four signal lines required for connection to CPU;(4)time counters and calendar counters;(5)1900/2000 identification bit for year 2000 compliance;(6)interrupt circuit configured to generate interrupt signals to the CPU and provided with an interrupt flag and an interrupt halt circuit;(7)2 alarm circuit;(8)32-kHz clock circuit;(9)oscillation halt sensing circuit which can be used to judge the validity of internal data;(10)supply voltage monitoring circuit with two supply voltage monitoring thershold settings.

The absolute maximum ratings of the RS5C348A can be summarized as:(1):the symbol is VDD,the item is supply voltage,the rating is -0.3 to +6.5,the unit is V;(2):the symbol is VI,the item is input voltage,the rating is -0.3 to +6.5,the unit is V;(3):the symbol is VO,the item is output voltage1,the rating is -0.3 to VDD+0.3,the unit is V;(4):the symbol is VO,the item is output voltage2,the rating is -0.3 to +6.5,the unit is V;(5):the symbol is PD,the item is power dissipation,the rating is 300,the unit is mW;(6):the symbol is Topt,the item is operating temperature,the rating is -40 to +85,the unit is ;(7):the symbol is Tstg,the item is storage temperature,the rating is -55 to +125,the unit is .