Real-time Clock Module

The PT7C43390 is a CMOS I 2C-bus real-time clock IC, which operates with the very low current consumption and in the wide range of operation voltage. 

The operation voltage is 1.35 V to 5.5 V so that the RTC can be used for various power supplies from main supply to backup battery. In the system which operates with a backup battery, the included free registers can be used as the function for user’s backup memory. Users always can take back the information in the registers which is stored before power-off the main power supply, after the voltage is restored. The IC has the function to correct advance / delay of the clock data speed, in the wide range, which is caused by the oscillation circuit’s frequency deviation. Correcting according to the temperature change by combining this function and a temperature sensor, it is possible to make a high precise clock function which is not affected by the ambient temperature. 

Applications 

 Mobile game device, mobile phone 

 Industrial control 

 Electronic power meter 

 DVD recorder 

 Car navigation 

 IP Camera, DVR, NVR

Features 

 Low current consumption: 0.3µA typ. (VDD=3.0V, TA = 25°C)  Wide operating voltage range: 1.35 to 5.5 V  Minimum time keeping operation voltage: 1.25 V  Built-in clock adjustment function  Built-in free user register  2-wire (I 2C-bus) CPU interface  Built-in alarm interrupter  Built-in flag generator at power down or power on  Auto calendar up to the year 2099, automatic leap year calculation function  Built-in constant voltage circuit  Built-in 32 kHz crystal oscillator circuit  Package: SOIC-8L, TSSOP-8L, and TDFN2x3-8L 

Datasheet