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RICOH ELECTRONIC DEVICES CO., LTD.

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2-wire Serial Interface (I2C Bus)

Product Name Time Keeping
Current
Typ. (at 3V)
Time Keeping Voltage Alarm Function 32kHz Clock Output Battery Checker Other Features Package Download
R2023 0.45 μA Typ. 0.66V to 5.50V
Worst.1.0V to 5.5V
2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
1.6V or 1.3V   QFN023023-16
TSSOP10G
Datasheet
R2025 0.48 μA 1.15V to 5.50V 2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
2.1V or 1.3V Built-in Crystal Unit,
Frequency Deviation (0±5ppm)
SOP14
SON22
Datasheet
R2051 0.40 µA Typ. 0.75V to 5.50V
Worst.1.0V to 5.5V
2 Sets
(W/H/M, H/M)
CMOS Output,
with Level Shifter
2.10V or 1.35V VD with DELAY Function,
Back-up Battery Switch-over Circuit,
Detector Threshold Voltage: 2.4V, 2.8V, 4.0V
QFN023023-16
SSOP16
TSSOP10G
Datasheet
R2221 0.3 µA *1 Typ. 0.6V to 5.5V
Worst. 0.9V to 5.5V
2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
1.35V ECO mode is set by ECO Pin. QFN018018-12
TSSOP10G
Datasheet
R2223 ECO mode is set by a Register.
RS5C372A 0.5 µA 1.3V to 6.0V 2 Sets
(W/H/Mx2)
Nch Open Drain Output
(Controllable by Command)
32768 Hz/ 32000 Hz Crystal Selectable SSOP8 Datasheet
RS5C372B 1.45V to 6.00V CMOS Output
(Controllable by Command)
RV5C386A 0.35 µA 1.45V to 5.50V 2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
2.1V or 1.6V   SSOP10G Datasheet
RV5C387A 0.35 µA 1.45V to 5.50V 2 Sets
(W/H/M, H/M)
Nch Open Drain Output
(Controllable by Command)
2.1V or 1.6V   SSOP10G Datasheet

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  • *1Time keeping current can be reduced in ECO mode.

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