PT7C43390 Overview
The PT7C43390 is a CMOS I2C-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.
PT7C43390 Key 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 (I2C-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
- Built-in constant voltage circuit