The voltage detectors are the ICs that always watch over the input voltage and detect when the input voltage drops below the set detect value. In addition, they work to protect the battery by alarming and watching if the input voltage comes from rechargeable battery.

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SERIES	TYPE	DETECT VOLTAGE (V)		VOLTAGE OPERATING (V)		SUPPLY CURRENT (μA)	OUTPUT	PACKAGE	PDF
		MIN	MAX	MIN	MAX
XC6101/XC6111 XC6102/XC6112 XC6103/XC6113 XC6104/XC6114 XC6105/XC6115 XC6116 XC6117	Watchdog, Manual Reset	1.6	5	1	6	5	Open Drain CMOS	SOT-25 USP-6C
XC6120 NEW	Low power supply	1	5	0.7	6	0.6	CMOS Open drain	USP-3 SSOT-24
XC6121 NEW XC6122 NEW XC6123 NEW XC6124 NEW	Watchdog, ON/OFF Function	1.6	5	1	6	5	N-ch Open Drain	USP-6C SOT-25
XCM410	2 Channel Voltage Detector	0.8	5	1	6	1.7	N-ch open drain	SOT-25
XC6118 NEW	Separated Sense Pin	0.8	5	1	6	0.4	CMOS N-ch open drain	USP-4 SOT-25
XC6119 NEW	Delay Time Adjustable	0.8	5	0.7	6	0.5	CMOS N-ch Open Drain	SSOT-24 USPN-4
XC61HC NEW XC61HN NEW	Delay Circuit Built-In	1.6	6	0.7	10	1	CMOS N-ch open drain	SOT-23
XE61CC NEW XE61CN NEW	Low power supply	1.6	6	0.7	10	0.7	CMOS N-ch open drain	SOT-23 SOT-89
XC61CC XC61CN	Low power supply (refer to XC6120)	0.8	6	0.7	10	0.7	CMOS Open Drain	SSOT-24 SOT-23 SOT-89 TO-92
XC61FC XC61FN	Delay Built-In	1.6	6	0.7	10	1	CMOS Open Drain	SOT-23 SOT-89 TO-92
XC61GC XC61GN	Ultra small package (refer to XC6120)	0.8	6	0.7	10	0.7	CMOS Open Drain	USP-3
XC6108	Separated Sense Pin (refer to XC6118)	0.8	5	1	6	0.8	Open Drain CMOS	USP-4 SOT-25
XC6109	Capacitor Delay Type (refer to XC6119)	0.8	5	0.7	6	0.9	Open Drain CMOS	SSOT-24