Datasheet
Real-Time Clock (RTC) series
I2C BUS Serial Interface RTC
with High-precision Oscillation Adjustment
BU9873
Outline
Important Characteristics
The BU9873 is a CMOS real-time clock, which has a
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Time Keeping Voltage
Time Keeping Current 1
(VDD=3V, Ta=+25°C)
Time Keeping Current 2
(VDD=3V, Ta=-40°C to +85°C)
Power Supply Voltage
Access Frequency 1
(VDD=1.8V to 2.5V)
1.45V to 5.5V
0.4µA (Typ)
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.
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1.0µA (Max)
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1.8V to 5.5V
100kHz (Max)
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Access Frequency 2
(VDD=2.5V to 5.5V)
400kHz (Max)
Package
W (Typ) x D (Typ) x H (Max)
Features
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Connected to the CPU via I2C Interface
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Time (Hour・Minute・Second, Selectable 12-Hour
and 24-Hour Mode Setting)
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Calendar (Year・Month・Day・Week)
Periodic Interrupt Function
(Output from INTRB, Ranging from 1 Second to 1
Month)
SOP8
MSOP8
2.90mm x 4.00mm x 0.90mm
5.00mm x 6.20mm x 1.71mm
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Alarm Interrupt Function
(Day-of-Week ・Hour ・Minute in Setting Format,
Output from INTRB)
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Oscillation Halt Sensing Function
32.768 kHz Clock Output
SOP- J8
4.90mm x 6.00mm x 1.65mm
VSON008X2030
2.00mm x 3.00mm x 0.60mm
(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
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TSSOP-B8
3.00mm x 6.40mm x 1.20mm
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○Product structure: Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays
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TSZ02201-0919AGZ00010-1-2
13.Sep.2013 REV.001
© 2013 ROHM Co., Ltd. All rights reserved.
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