I²C BUS Serial Interface RTC with High-precision Oscillation Adjustment - BU9873FVT

The BU9873 is a CMOS real-time clock, which has a built-in interrupt generation function. This product is connected to the CPU via I²C interface, and configured to perform serial transmission of time and calendar data to the CPU. A high-precision oscillation adjustment circuit is also integrated, which is capable of adjusting time counts with digital method, and correcting deviations in the oscillation frequency of the crystal oscillator.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BU9873FVT-GE2 Active TSSOP-B8 3000 3000 Taping Yes
Time Keeping Voltage(Min.)[V] 1.45
Time Keeping Current(Typ.)[uA] 0.4
Time Keeping Current(Max.)[uA] 1
Supply voltage(Min.)[V] 1.8
Supply voltage(Max.)[V] 5.5
Access Frequency 1 [kHz] 100
Access Frequency 1 [kHz] 400
  • ・Connected to the CPU via I²C Interface
    ・Time (Hour・Minute・Second, Selectable 12-Hour and 24-Hour Mode Setting)
    ・Calendar (Year・Month・Day・Week)
    ・Periodic Interrupt Function (Output from INTRB, Ranging from 1 Second to 1 Month)
    ・Alarm Interrupt Function (Day-of-Week・Hour・Minute in Setting Format, Output from INTRB)
    ・Oscillation Halt Sensing Function
    ・32.768 kHz Clock Output (Output from 32KOUT with Control Pin)
    ・±30 Second Adjustment Function
    ・Automatic Leap Year Recognition up to the Year 2099
    ・Built-in Oscillation Stabilizing Capacitors (CG, CD)
    ・High-Precision Oscillation Adjustment Circuit
Pin Configuration:
Pin Configration
Other New/Updated Products Relating to Clocks & Timers
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Technical Data
Application Note

Thermal Resistance