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2-wire Serial Interface (I²C Bus)

4-wire Serial Interface (SPI Bus)
3-wire Serial Interface
2-wire Serial Interface (I²C Bus)

Product Name	Time Keeping Current Typ.	Time Keeping Voltage	Alarm Function	Perodic Interupt Function	32kHz Clock Output	Battery Checker	Clock Adjust Function	OSC Halt Sensing	Back-up battery switch-over circuit	VD with DELAY Function	Others	Package	Data Sheet (PDF)
Product Name	Time Keeping Current Typ.	Time Keeping Voltage	Alarm Function	Perodic Interupt Function	32kHz Clock Output	Battery Checker	Clock Adjust Function	OSC Halt Sensing	Back-up battery switch-over circuit	VD with DELAY Function	Switch-over Threshold/ Detector Threshold	Package	Data Sheet (PDF)
R2023K/T	0.45μA (at 3V)	Typ. 0.66V to 5.50V Worst.1.0V to 5.5V	2set (W/H/M, H/M)	0.5s to 1Month	CMOS output, with Control pin	1.6V or 1.3V						FFP12 TSSOP10G
R2025S/D	0.48μA (at 3V)	1.15V to 5.50V	2set (W/H/M, H/M)	0.5s to 1Month	CMOS output, with Control pin	2.1V or 1.3V					Built-in crystal unit Frequency Deviation (0±5ppm)	SOP14 SON22
R2051S/K/T	0.40µA (at 3V)	Typ. 0.75V to 5.50V Worst.1.0V to 5.5V	2set (W/H/M, H/M)	0.5s to 1Month	CMOS output, with Level shifter	2.10V or 1.35V					2.4V, 2.8V, 4.0V	SSOP16
			2set (W/H/M, H/M)	0.5s to 1Month							2.4V, 2.8V	FFP12
			(Register only. No INTR pin)	(Register only. No INTR pin)						－	2.4V	TSSOP10G
R2221T/L	0.3µA ^*1 (at 3V)	Typ. 0.6V to 5.5V Worst. 0.9V to 5.5V	2set (W/H/M, H/M)	0.5s to 1Month	CMOS output, with Control pin	1.35V					ECO mode is set by pin	QFN018018-12 (under development) TSSOP10G
R2223T/L	0.3µA ^*1 (at 3V)	Typ. 0.6V to 5.5V Worst. 0.9V to 5.5V	2set (W/H/M, H/M)	0.5s to 1Month	CMOS output, with Control pin	1.35V					ECO mode is set by register	QFN018018-12 (under development) TSSOP10G
RS5C372A	0.5µA (at 3V)	1.3V to 6.0V	2set (W/H/Mx2)	0.5s to 1Month	Nch Open drain (Controllable by command)	－					32768Hz/ 32000Hz crystal selectable	SSOP8
RS5C372B	0.5µA (at 3V)	1.45V to 6.00V	2set (W/H/Mx2)	0.5s to 1Month	CMOS output (Controllable by command)	－					32768Hz/ 32000Hz crystal selectable	SSOP8
RV5C386A	0.35µA (at 3V)	1.45V to 5.50V	2set (W/H/M, H/M)	0.5s to 1Month	CMOS output, with Control pin	2.1V or 1.6V						SSOP10G
RV5C387A	0.35µA (at 3V)	1.45V to 5.50V	2set (W/H/M, H/M)	0.5s to 1Month	Nch Open drain (Controllable by command)	2.1V or 1.6V						SSOP10G
Product Name	Time Keeping Current Typ.	Time Keeping Voltage	Alarm Function	Perodic Interupt Function	32kHz Clock Output	Battery Checker	Clock Adjust Function	OSC Halt Sensing	Back-up battery switch-over circuit	VD with DELAY Function	Others	Package	Data Sheet (PDF)
Product Name	Time Keeping Current Typ.	Time Keeping Voltage	Alarm Function	Perodic Interupt Function	32kHz Clock Output	Battery Checker	Clock Adjust Function	OSC Halt Sensing	Back-up battery switch-over circuit	VD with DELAY Function	Switch-over Threshold/ Detector Threshold	Package	Data Sheet (PDF)