18 Timers & Real-Time Clocks 40

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Part	Manufacturer	Peripheral IC Type	Temperature Grade	Terminal Form	No. of Terminals	Package Code	Package Shape	Package Body Material	Surface Mount	Information Access Method	Maximum Supply Voltage	On Chip Data RAM Width	No. of Bits	Power Supplies (V)	Package Style (Meter)	Package Equivalence Code	Interrupt Capability	Minimum Supply Voltage	Maximum Operating Temperature	Minimum Operating Temperature	Terminal Finish	Terminal Position	Maximum Seated Height	RAM Words	Width	Additional Features	External Data Bus Width	Maximum Clock Frequency	Maximum Time At Peak Reflow Temperature (s)	Peak Reflow Temperature (C)	Length	No. of Timers	Technology	Maximum Supply Current	Minimum Time	Nominal Supply Voltage	Sub-Category	Bus Compatibility	Terminal Pitch	JESD-30 Code	Moisture Sensitivity Level (MSL)	Qualification	Volatile	JESD-609 Code
M41T83SMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL(I2C)	5.5 V	8	8	3.3/5	SMALL OUTLINE	SOP8,.4	Y	3 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm	7	7.62 mm			.4 MHz	30	240	11.61 mm	1	CMOS	.15 mA	1/100 SECOND	5 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T81SMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			3/5	SMALL OUTLINE	SOP18,.4	Y	2.7 V	85 Cel	-40 Cel	Matte Tin (Sn)	DUAL	2.69 mm		7.62 mm			.032 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND	5 V	Timers or RTCs		1.27 mm	R-PDSO-G18	3	Not Qualified	YES	e3
M41T83RMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL(I2C)	5.5 V	8	8	3/5	SMALL OUTLINE	SOP8,.4	Y	2.7 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm	7	7.62 mm			.4 MHz	30	240	11.61 mm	1	CMOS	.15 mA	1/100 SECOND	3 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T83ZMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL(I2C)	5.5 V	8	8	3/5	SMALL OUTLINE	SOP8,.4	Y	2.38 V	85 Cel	-40 Cel	Matte Tin (Sn)	DUAL	2.69 mm	7	7.62 mm			.4 MHz	30	245	11.61 mm	1	CMOS	.15 mA	1/100 SECOND	3 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T93RMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL, 4 WIRE/SPI	5.5 V		8	3/5	SMALL OUTLINE	SOP18,.4	Y	2.7 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm		7.62 mm			5 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND	3 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T81SMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			3/5	SMALL OUTLINE	SOP18,.4	Y	2.7 V	85 Cel	-40 Cel	MATTE TIN	DUAL	2.69 mm		7.62 mm			.032 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND	5 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	YES	e3
RTC72421A	Fox Electronics	TIMER, REAL TIME CLOCK	COMMERCIAL	THROUGH-HOLE	18	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	PARALLEL	5.5 V			5	IN-LINE	DIP18,.3	N	4.5 V	70 Cel	-10 Cel	TIN LEAD	DUAL			7.62 mm						23.1 mm		CMOS		SECONDS	5 V	Timer or RTC		2.54 mm	R-PDIP-T18		Not Qualified	YES	e0
RTC-72421A	Seiko Epson	TIMER, REAL TIME CLOCK	COMMERCIAL	THROUGH-HOLE	18	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	PARALLEL, DIRECT ADDRESS/MUXED BUS	5.5 V			5	IN-LINE	DIP18,.3	N	4.5 V	70 Cel	-10 Cel		DUAL	4.2 mm		7.62 mm		4	.032 MHz	NOT SPECIFIED	NOT SPECIFIED		0	CMOS	.01 mA	SECONDS	5 V	Timer or RTC	8048; 8051; 8085	2.54 mm	R-PDIP-T18		Not Qualified	YES
M41T81SMY6	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			3/5	SMALL OUTLINE	SOP18,.4	Y	2.7 V	85 Cel	-40 Cel	MATTE TIN	DUAL	2.69 mm		7.62 mm			.032 MHz			11.61 mm	1	CMOS		1/100 SECOND	5 V	Timer or RTC		1.27 mm	R-PDSO-G18	1	Not Qualified	YES	e3
M41T93ZMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL, 4 WIRE/SPI	5.5 V		8	2.4/5.5	SMALL OUTLINE	SOP18,.4	Y	2.38 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm		7.62 mm			10 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND	3 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T83SMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V		8	3.3/5	SMALL OUTLINE	SOP8,.4	Y	3 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm		7.62 mm			.4 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND	5 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T83ZMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V		8	3/5	SMALL OUTLINE	SOP8,.4	Y	2.38 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm		7.62 mm			.4 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND	3 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T93SMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL, 4 WIRE/SPI	5.5 V		8	3.3/5	SMALL OUTLINE	SOP18,.4	Y	3 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm		7.62 mm			5 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND		Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T93RMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL, 4 WIRE/SPI	5.5 V		8	3/5	SMALL OUTLINE	SOP18,.4	Y	2.7 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm		7.62 mm			5 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND	3 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
MSM6242BRS	Lapis Semiconductor	TIMER, REAL TIME CLOCK	INDUSTRIAL	THROUGH-HOLE	18	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	PARALLEL, DIRECT ADDRESS/MUXED BUS	6 V			5	IN-LINE	DIP18,.3	N	4 V	85 Cel	-40 Cel	Tin/Lead (Sn/Pb)	DUAL	5.08 mm		7.62 mm	TIMEKEEPING CURRENT = 10UA; MIN PROGRAMMABLE DELAY = 0.01562S; 30 SEC ADJUSTMENT	4	.032 MHz			22.6 mm	0	CMOS		SECONDS	5 V	Timer or RTC		2.54 mm	R-PDIP-T18		Not Qualified	YES	e0
RTC-72421B	Seiko Epson	TIMER, REAL TIME CLOCK	COMMERCIAL	THROUGH-HOLE	18	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	PARALLEL, DIRECT ADDRESS/MUXED BUS	5.5 V			5	IN-LINE	DIP18,.3	N	4.5 V	70 Cel	-10 Cel		DUAL	4.2 mm		7.62 mm		4	.032 MHz	NOT SPECIFIED	NOT SPECIFIED	22.606 mm	0	CMOS	.01 mA	SECONDS	5 V	Timer or RTC	8048; 8051; 8085	2.54 mm	R-PDIP-T18		Not Qualified	YES
RTC72421B	Fox Electronics	TIMER, REAL TIME CLOCK	COMMERCIAL	THROUGH-HOLE	18	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	PARALLEL	5.5 V			5	IN-LINE	DIP18,.3	N	4.5 V	70 Cel	-10 Cel	TIN LEAD	DUAL			7.62 mm						23.1 mm		CMOS		SECONDS	5 V	Timer or RTC		2.54 mm	R-PDIP-T18		Not Qualified	YES	e0
M41T81MY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			2.5/5	SMALL OUTLINE	SOP18,.4	Y	2 V	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD	DUAL	2.69 mm		7.62 mm						11.61 mm	1	CMOS		1/100 SECOND		Timer or RTC		1.27 mm	R-PDSO-G18		Not Qualified	YES	e4
M41T82ZMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V		8		SMALL OUTLINE			2.38 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm		1	.4 MHz	30	260	11.61 mm	1	CMOS						1.27 mm	R-PDSO-G18		Not Qualified
M41T82RMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V		8		SMALL OUTLINE			2.7 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm		1	.4 MHz	30	260	11.61 mm	1	CMOS						1.27 mm	R-PDSO-G18		Not Qualified
M41T00SC64MY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL, 2-WIRE/I2C	5.5 V			3/5	SMALL OUTLINE	SOP18,.4	N	2.7 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm		0	.032 MHz	NOT SPECIFIED	NOT SPECIFIED	11.6 mm		CMOS		SECONDS	3 V	Timer or RTC		1.27 mm	R-PDSO-G18		Not Qualified
M41T81MY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			2.5/5	SMALL OUTLINE	SOP18,.4	Y	2 V	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD	DUAL	2.69 mm		7.62 mm						11.61 mm	1	CMOS		1/100 SECOND		Timer or RTC		1.27 mm	R-PDSO-G18		Not Qualified	YES	e4
M41T81MY6TR	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			2.5/5	SMALL OUTLINE	SOP18,.4	Y	2 V	85 Cel	-40 Cel	TIN LEAD	DUAL	2.69 mm		7.62 mm			.032 MHz			11.61 mm	1	CMOS		1/100 SECOND	5 V	Timer or RTC		1.27 mm	R-PDSO-G18		Not Qualified	NO	e0
M41T82SMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V		8		SMALL OUTLINE			3 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm		1	.4 MHz	30	260	11.61 mm	1	CMOS						1.27 mm	R-PDSO-G18		Not Qualified
M41T56C64MY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			5	SMALL OUTLINE	SOP18,.4	N	4.5 V	85 Cel	-40 Cel	MATTE TIN	DUAL	2.69 mm		7.62 mm			.032 MHz			11.61 mm		CMOS		SECONDS	5 V	Timer or RTC		1.27 mm	R-PDSO-G18	1	Not Qualified	YES	e3
M41T93ZMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL, 4 WIRE/SPI	5.5 V		8	2.4/5.5	SMALL OUTLINE	SOP18,.4	Y	2.38 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm		7.62 mm			10 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND	3 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T81SMY6T	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			3/5	SMALL OUTLINE	SOP18,.4	Y	2.7 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm			.032 MHz	40	260	11.61 mm	1	CMOS		1/100 SECOND	5 V	Timer or RTC		1.27 mm	R-PDSO-G18		Not Qualified	YES
M41T82SMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V		8		SMALL OUTLINE			3 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm		1	.4 MHz	30	260	11.61 mm	1	CMOS						1.27 mm	R-PDSO-G18		Not Qualified
M41T83RMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V		8	3/5	SMALL OUTLINE	SOP8,.4	Y	2.7 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm		7.62 mm			.4 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND	3 V	Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T93SMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL, 4 WIRE/SPI	5.5 V		8	3.3/5	SMALL OUTLINE	SOP18,.4	Y	3 V	85 Cel	-40 Cel	Matte Tin (Sn) - annealed	DUAL	2.69 mm		7.62 mm			5 MHz	30	240	11.61 mm	1	CMOS		1/100 SECOND		Timers or RTCs		1.27 mm	R-PDSO-G18	1	Not Qualified	NO	e3
M41T82ZMY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V		8		SMALL OUTLINE			2.38 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm		1	.4 MHz	30	260	11.61 mm	1	CMOS						1.27 mm	R-PDSO-G18		Not Qualified
M41T56C64MY6	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			5	SMALL OUTLINE	SOP18,.4	N	4.5 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm				NOT SPECIFIED	NOT SPECIFIED	11.61 mm		CMOS		SECONDS	5 V	Timer or RTC		1.27 mm	R-PDSO-G18		Not Qualified	YES
M41T82RMY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V		8		SMALL OUTLINE			2.7 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm		1	.4 MHz	30	260	11.61 mm	1	CMOS						1.27 mm	R-PDSO-G18		Not Qualified
M41T56C64MY6TR	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			5	SMALL OUTLINE	SOP18,.4	N	4.5 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm				NOT SPECIFIED	NOT SPECIFIED	11.61 mm		CMOS		SECONDS	5 V	Timer or RTC		1.27 mm	R-PDSO-G18		Not Qualified	YES
M41T56C64MY6F	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			5	SMALL OUTLINE	SOP18,.4	N	4.5 V	85 Cel	-40 Cel	MATTE TIN	DUAL	2.69 mm		7.62 mm			.032 MHz			11.61 mm		CMOS		SECONDS	5 V	Timer or RTC		1.27 mm	R-PDSO-G18	1	Not Qualified	YES	e3
M41T81MY6	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	I2C	5.5 V			2.5/5	SMALL OUTLINE	SOP18,.4	Y	2 V	85 Cel	-40 Cel	TIN LEAD	DUAL	2.69 mm		7.62 mm			.032 MHz			11.61 mm	1	CMOS		1/100 SECOND	5 V	Timer or RTC		1.27 mm	R-PDSO-G18		Not Qualified	NO	e0
M41T00SC64MY6E	STMicroelectronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	GULL WING	18	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	SERIAL, 2-WIRE/I2C	5.5 V			3/5	SMALL OUTLINE	SOP18,.4	N	2.7 V	85 Cel	-40 Cel		DUAL	2.69 mm		7.62 mm		0	.032 MHz	NOT SPECIFIED	NOT SPECIFIED	11.6 mm		CMOS		SECONDS	3 V	Timer or RTC		1.27 mm	R-PDSO-G18		Not Qualified
TC8521AP	Toshiba	TIMER, REAL TIME CLOCK	INDUSTRIAL	THROUGH-HOLE	18	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	PARALLEL, DIRECT ADDRESS	5.5 V			3/5	IN-LINE	DIP18,.3	Y	4.5 V	85 Cel	-40 Cel	Tin/Lead (Sn/Pb)	DUAL	4.5 mm		7.62 mm		4				22 mm		CMOS		SECONDS	5 V	Timer or RTC		2.54 mm	R-PDIP-T18		Not Qualified	YES	e0
UPD4991ACX-A	Renesas Electronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	THROUGH-HOLE	18	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	PARALLEL, DIRECT ADDRESS	5.5 V		1	5	IN-LINE	DIP18,.3	Y	2 V	85 Cel	-40 Cel	TIN BISMUTH	DUAL	5.08 mm		7.62 mm		4	.032 MHz	10	260		1	CMOS		SECONDS	5 V	Timer or RTC		2.54 mm	R-PDIP-T18		Not Qualified	YES	e6
UPD4991ACX	Renesas Electronics	TIMER, REAL TIME CLOCK	INDUSTRIAL	THROUGH-HOLE	18	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	PARALLEL, DIRECT ADDRESS	5.5 V		4	5	IN-LINE	DIP18,.3	Y	2 V	85 Cel	-40 Cel	TIN LEAD	DUAL	5.08 mm		7.62 mm		4	.032 MHz					CMOS		SECONDS	5 V	Timer or RTC		2.54 mm	R-PDIP-T18		Not Qualified	YES	e0

Timers & Real-Time Clocks

Timers and real-time clocks (RTCs) are electronic devices that are used to measure and track time intervals in electronic systems. They are crucial components in many applications, such as control systems, automation systems, and consumer electronics.

A timer is an electronic device that is used to measure the duration of time intervals. Timers can be either digital or analog and can be used to measure time intervals ranging from microseconds to hours or even days. They can be used for a variety of applications, such as controlling the duration of a signal or triggering an event after a specified time interval.

A real-time clock (RTC) is a clock that keeps track of the current time and date. Unlike a timer, an RTC is capable of keeping track of time even when the system is powered off. RTCs are commonly used in consumer electronics such as watches, clocks, and digital cameras, as well as in control systems, data loggers, and other applications that require accurate timekeeping.