Real Time Clocks | Farnell® UK

Real-Time Clock products offer a diverse range of real-time clock (RTC) solutions for networking and embedded applications. The primary function of RTC is to keep time and calendar data.We offer Real Time Clock (RTC) functions including Alarm RTC, Binary Counter, Real Time Calendar Clock (RTCC), Elapsed Time Recorder and Real Time Event Recorder. Use of a hardware RTC allows microcontrollers like the Raspberry Pi to be used without internet access and still provide services that use time stamps. For example, the DS1307 is a commonly available I2C based RTC module – so using the DS1307’s I2C protocol, which is supported by the Raspberry Pi, real time clock support can easily and cost-effectively be added.Another popular RTC module, also with I2C support, is the DS3231. The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping when mains power to the device is interrupted. Accuracy is ±2ppm from 0°C to +40°C, and ±3.5ppm from -40°C to +85°C.Apart from I2C, other interface types include 2 wire, 3 wire, 4 wire, Motorola Serial Peripheral Interface (SPI), Bytewide, Parallel, Multiplexed, and Phantom Clock.Operating temperatures range from -40°C minimum to +125°C maximum. Products are available to the AEC-Q100 Automotive Qualification Standard.

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			Price For		Quantity

PCF8563T/F4,118	2841031 Data Sheet RoHS Date/Lot Code	NXP RTC Date Time Format (DD:MM:YY HH:MM:SS Century Flag) 400 kbit/s I2C 1.8V to 5.5V SOIC-8	Each (Supplied on Cut Tape) Cut Tape	1+ £1.350 10+ £0.992 50+ £0.889 100+ £0.800 250+ £0.753 More Pricing...	Min: 1 / Mult: 1	DD:MM:YY	HH:MM:SS	Alarm RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
ISL12057IUZ-T	2983744 Data Sheet RoHS Date/Lot Code	RENESAS RTC Alarm Date Time Format (Day/Date/Month/Year HH:MM:SS) I2C 1.4V to 3.6V Supply MSOP-8	Each (Supplied on Cut Tape) Cut Tape	1+ £3.000 10+ £2.100 25+ £1.810 50+ £1.660 100+ £1.500 More Pricing...	Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	Alarm RTC	1.4V	3.6V	MSOP	8Pins	I2C	-40°C	85°C	-	-
DS1307ZN+T&R	2798724 Data Sheet RoHS Date/Lot Code	ANALOG DEVICES RTC IC Date Time Format (Day/Date/Month/Year hh:mm:ss) I2C 4.5 V to 5.5 V supply SOIC-8	Each (Supplied on Cut Tape) Cut Tape	1+ £4.390 10+ £3.360 25+ £3.050 100+ £2.810 250+ £2.660 More Pricing...	Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	4.5V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
PCF8563T/5,518	2775929RL Data Sheet RoHS Date/Lot Code	NXP Real Time Clock/Calendar IC I2C 1 V to 5.5 V HH:MM:SS YY-MM-DD-DW SOIC-8	Each (Supplied on Cut Tape) Re-Reel Packaging Options	100+ £0.378 250+ £0.353 500+ £0.338 1000+ £0.326 2500+ £0.319	Min: 100 / Mult: 1	YY-MM-DD-DW	HH:MM:SS: 24Hr	Calendar, Clock	1V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
M48T35-70PC1	1467735 Data Sheet RoHS Date/Lot Code	STMICROELECTRONICS RTC Timekeeper NVSRAM Parallel 4.75 V to 5.5 V DIP-28	Each Hazardous Item: There maybe additional transit time on this item. Delivery of other items on your order will be unaffected.	1+ £44.530 5+ £40.810 10+ £37.090 25+ £34.860	Min: 1 / Mult: 1	YY-MM-DD-dd	HH:MM:SS	Timekeeper	4.75V	5.5V	DIP	28Pins	Parallel	0°C	70°C	-	-
MCP79400-I/MS	2361121 Data Sheet RoHS Date/Lot Code	MICROCHIP Alarm RTC IC Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr I2C 1.8 V to 5.5 V MSOP-8	Each	1+ £0.821 25+ £0.755 100+ £0.714 250+ £0.700	Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	12Hr / 24Hr	Alarm RTC	1.8V	5.5V	MSOP	8Pins	I2C	-40°C	85°C	-	-
MCP79401-I/SN	2361118 Data Sheet RoHS Date/Lot Code	MICROCHIP Alarm RTC IC Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr I2C 1.8 V to 5.5 V SOIC-8	Each	1+ £0.853 25+ £0.788 100+ £0.747 250+ £0.732	Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	12Hr / 24Hr	Alarm RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
MCP79412T-I/MNY	2361123 Data Sheet RoHS Date/Lot Code	MICROCHIP Alarm RTC IC Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr I2C 1.8 V to 5.5 V TDFN-8	Each (Supplied on Cut Tape) Cut Tape	1+ £0.909 25+ £0.835 100+ £0.791 3300+ £0.783	Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	12Hr / 24Hr	Alarm RTC	1.8V	5.5V	TDFN	8Pins	I2C	-40°C	85°C	-	AEC-Q100
MCP79412-I/SN	2103565 Data Sheet RoHS Date/Lot Code	MICROCHIP Calendar Clock IC Year/Month/Week/Date/Hr/Min/Sec hh:mm:ss I2C 1.8 V to 5.5 V SOIC-8	Each	1+ £1.470 25+ £1.290 100+ £1.070 250+ £0.958	Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	HH:MM:SS	Calendar, Clock	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	AEC-Q100
MCP79510-I/MS	2361124 Data Sheet RoHS Date/Lot Code	MICROCHIP Alarm RTC IC Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr SPI 1.8 V to 3.6 V MSOP-10	Each	1+ £1.080 25+ £1.000 100+ £0.946 250+ £0.927	Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	12Hr / 24Hr	Alarm RTC	1.8V	3.6V	MSOP	10Pins	SPI	-40°C	85°C	-	AEC-Q100
MCP79400-I/SN	2361117 Data Sheet RoHS Date/Lot Code	MICROCHIP Alarm RTC IC Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr I2C 1.8 V to 5.5 V SOIC-8	Each	1+ £0.780 25+ £0.722 100+ £0.681 250+ £0.667	Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	12Hr / 24Hr	Alarm RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
AB0805-T3	2302153 Data Sheet RoHS Date/Lot Code	ABRACON RTC IC RC/XTAL 1.7 V to 3.6 V QFN 16Pins I2C	Each Packaging Options	1+ £1.610 10+ £1.190 50+ £1.100 100+ £1.000 250+ £0.963 More Pricing...	Min: 1 / Mult: 1	-	-	RTC	1.7V	3.6V	QFN	16Pins	I2C	-40°C	85°C	AB08XX	-
MCP79402-I/SN	2361119 Data Sheet RoHS Date/Lot Code	MICROCHIP Alarm RTC IC Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr I2C 1.8 V to 5.5 V SOIC-8	Each	1+ £0.853 25+ £0.788 100+ £0.747 250+ £0.732	Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	12Hr / 24Hr	Alarm RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
M48T12-150PC1	9756523 Data Sheet RoHS Date/Lot Code	STMICROELECTRONICS RTC Timekeeper NVSRAM Parallel 4.5 V to 5.5 V DIP-24	Each Hazardous Item: There maybe additional transit time on this item. Delivery of other items on your order will be unaffected.	1+ £37.880 5+ £34.350 10+ £30.810 25+ £29.570 50+ £28.980	Min: 1 / Mult: 1	YY-MM-DD-dd	HH:MM:SS	Timekeeper	4.5V	5.5V	DIP	24Pins	Parallel	0°C	70°C	-	-
DS1339U-33+	2518691 Data Sheet RoHS Date/Lot Code	ANALOG DEVICES RTC IC Format (Day/Date/Month/Year/ss:mm:hh) I2C Serial 2.97 V to 5.5 V supply MSOP-8	Each	1+ £5.330 10+ £4.090 50+ £3.590 100+ £3.440 250+ £3.280 More Pricing...	Min: 1 / Mult: 1	Day; Date; Month; Year	ss:mm:hh	RTC	2.97V	5.5V	MSOP	8Pins	I2C, Serial	-40°C	85°C	-	-
DS1338Z-18+	2515348 Data Sheet RoHS Date/Lot Code	ANALOG DEVICES RTC IC Date Time Format (Day/Date/Month/Year hh:mm:ss) I2C 1.71 V to 5.5 V NSOIC-8	Each	1+ £4.970 10+ £3.520 25+ £3.360 100+ £3.200 300+ £3.020 More Pricing...	Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	1.71V	5.5V	NSOIC	8Pins	I2C	-40°C	85°C	-	-
DS1340Z-33+T&R	2515466 Data Sheet RoHS Date/Lot Code	ANALOG DEVICES RTC IC Date Time Format (Day/Date/Month/Year hh:mm:ss) I2C 2.97 V to 5.5 V NSOIC-8	Each (Supplied on Cut Tape) Cut Tape	1+ £4.450 10+ £3.400 25+ £3.130 100+ £2.850 250+ £2.700 More Pricing...	Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	2.97V	5.5V	NSOIC	8Pins	I2C	-40°C	85°C	-	-
DS1388Z-3+	2515352 Data Sheet RoHS Date/Lot Code	ANALOG DEVICES RTC Date Time Format (Day/Date/Month/Year HH:MM:SS:hh) I2C 2.7V to 3.3V Supply NSOIC-8	Each	1+ £6.100 10+ £4.370 25+ £4.180 100+ £3.980 300+ £3.830 More Pricing...	Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS:hh	RTC	2.7V	3.3V	NSOIC	8Pins	I2C	-40°C	85°C	-	-
DS1302Z+	2519519 Data Sheet RoHS Date/Lot Code	ANALOG DEVICES Timekeeper IC Date Time Format (Day/Date/Month/Year hh:mm:ss) 3 Wire Serial 2 V to 5.5 V SOIC-8	Each	1+ £4.660 10+ £3.290 25+ £3.140 100+ £2.990 300+ £2.820 More Pricing...	Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	Timekeeper	2V	5.5V	SOIC	8Pins	3 Wire, Serial	0°C	70°C	-	-
DS1338U-33+T&R	2515461 Data Sheet RoHS Date/Lot Code	ANALOG DEVICES RTC IC Date Time Format (Day/Date/Month/Year hh:mm:ss) I2C 3 V to 5.5 V µSOP-8	Each (Supplied on Cut Tape) Cut Tape	1+ £4.390 10+ £3.350 25+ £3.100 100+ £2.810 250+ £2.670 More Pricing...	Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	3V	5.5V	µSOP	8Pins	I2C	-40°C	85°C	-	-
AB0805-T3	2467702 Data Sheet RoHS Date/Lot Code	ABRACON RTC IC Day:Date:Month:Year:Century HH:MM:SS:hh 1.5 V to 3.6 V QFN 16Pins I2C	Each (Supplied on Cut Tape) Cut Tape	5+ £1.610 50+ £1.100 100+ £1.000 500+ £0.921 1500+ £0.888	Min: 5 / Mult: 5	Day; Date; Month; Year; Century	HH:MM:SS:hh	RTC	1.5V	3.6V	QFN	16Pins	I2C	-40°C	85°C	-	-
DS12C887+	2515425 Data Sheet RoHS Date/Lot Code	ANALOG DEVICES Alarm RTC IC Date Time Format (Day/Date/Month/Year hh:mm:ss) Multiplexed 4.5 V to 5.5 V EDIP-24	Each	1+ £13.320 14+ £10.280 28+ £9.780 112+ £9.040 252+ £8.730 More Pricing...	Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	Alarm RTC	4.5V	5.5V	EDIP	24Pins	Multiplexed	0°C	70°C	-	-
MCP79411-I/SN	1971844 Data Sheet RoHS Date/Lot Code	MICROCHIP RTCC I2C 1K EE 64B SRAM 8SOIC	Each	1+ £0.913 25+ £0.871 100+ £0.830 250+ £0.813	Min: 1 / Mult: 1	YY-MM-DD	HH:MM:SS	Alarm RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	AEC-Q100
MCP79520-I/MS	2345963 Data Sheet RoHS Date/Lot Code	MICROCHIP Real Time Clock AEC-Q100 MSOP-10 SPI 1.8 V to 3.6 V -40 °C to 85 °C	Each	1+ £1.120 25+ £1.050 100+ £1.000 250+ £0.980	Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	1.8V	3.6V	MSOP	10Pins	SPI	-40°C	85°C	AEC-Q100	AEC-Q100
DS1302S+	2519293 Data Sheet RoHS Date/Lot Code	ANALOG DEVICES RTC IC Date Time Format (Date/Month/Year hh:mm:ss) Serial 2 V to 5.5 V SOIC-8	Each	1+ £4.680 10+ £3.590 88+ £2.900 176+ £2.880 264+ £2.850 More Pricing...	Min: 1 / Mult: 1	YY-MM-DD	HH:MM:SS	RTC	2V	5.5V	SOIC	8Pins	3 Wire, Serial	0°C	70°C	-	-