I²C BUS Serial Interface RTC with High-precision Oscillation Adjustment - BU9873FJ

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 is a standard-grade product.
For Automotive usage, please contact Sales.
Part Number | BU9873FJ-GTE2
Status | Active
Package | SOP-J8
Unit Quantity | 2500
Minimum Package Quantity | 2500
Packing Type | Taping
RoHS | Yes


Time Keeping Voltage(Min.)[V]


Time Keeping Current(Typ.)[uA]


Time Keeping Current(Max.)[uA]


Supply voltage(Min.)[V]


Supply voltage(Max.)[V]


Access Frequency 1 [kHz]


Access Frequency 1 [kHz]



・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