Real Time Clocks | e絡盟 Hong Kong

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

ISL12057IUZ-T	2983744 Data Sheet RoHS	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+ HK$22.900 10+ HK$17.110 25+ HK$15.600 50+ HK$14.810 100+ HK$14.010 More Pricing...	Total:HK$22.90 Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	Alarm RTC	1.4V	3.6V	MSOP	8Pins	I2C	-40°C	85°C	-	-
PCF2123BS/1,518	2775940 Data Sheet RoHS	NXP Calendar Clock IC Format (YYYY:MM:WK:DD:hh:mm:ss/Binary) I2C 1.1 V to 5.5 V supply HVQFN-16	Each (Supplied on Cut Tape) Cut Tape	1+ HK$11.380 10+ HK$8.300 50+ HK$7.520 100+ HK$6.670 250+ HK$6.260 More Pricing...	Total:HK$11.38 Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1.1V	5.5V	HVQFN	16Pins	I2C	-40°C	85°C	-	-
PCF85263AT/AJ	2775933 Data Sheet RoHS	NXP Calendar Clock IC Format (YYYY:MM:WK:DD:hh:mm:ss/Binary) I2C 900 mV to 5.5 V supply SOIC-8	Each (Supplied on Cut Tape) Cut Tape	5+ HK$10.440 50+ HK$6.870 100+ HK$6.070 500+ HK$5.450 1000+ HK$4.870	Total:HK$52.20 Min: 5 / Mult: 5	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	900mV	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
M41T94MQ6F	2806843 Data Sheet RoHS	STMICROELECTRONICS RTC Date Time Format (Day/Date/Month/Year/Century HH:MM:SS:hh) SPI 2.7V to 5.5V Supply SOIC-16	Each (Supplied on Cut Tape) Cut Tape	1+ HK$55.410 10+ HK$40.190 25+ HK$37.460 50+ HK$35.190 100+ HK$32.920 More Pricing...	Total:HK$55.41 Min: 1 / Mult: 1	Day; Date; Month; Year; Century	HH:MM:SS:hh	Alarm RTC	2.7V	5.5V	SOIC	16Pins	SPI	-40°C	85°C	-	-
M41T81M6F	3367096 Data Sheet RoHS	STMICROELECTRONICS REAL-TIME CLOCK W/ALARM -40 TO 85DEG C	Each (Supplied on Cut Tape) Cut Tape	1+ HK$23.990 10+ HK$17.960 25+ HK$16.450 50+ HK$15.610 100+ HK$14.760 More Pricing...	Total:HK$23.99 Min: 1 / Mult: 1	Day; Date; Month; Year; Century	HH:MM:SS:hh	Alarm RTC	2V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
RV-3049-C3-TA-QC-OPT.A	2358518 Data Sheet RoHS	MICRO CRYSTAL RTC IC Date Time Format (Year/Month/Date/Hr/Min/Sec 24Hr) SPI 1.3 V to 5.5 V SON-10	Each	1+ HK$69.980 10+ HK$55.950 25+ HK$52.200 50+ HK$49.900 100+ HK$47.850 More Pricing...	Total:HK$69.98 Min: 1 / Mult: 1	YYYY:MM:DD:Hr:Min:Secs	24Hr	RTC	1.3V	5.5V	SON	10Pins	SPI	-40°C	85°C	-	-
M41T11M6F	2463678 Data Sheet RoHS	STMICROELECTRONICS RTC IC Date Time Format (Date/Month/Year ss:mm:hh) I2C 2 V to 5.5 V SOIC-8	Each (Supplied on Cut Tape) Cut Tape	1+ HK$27.790 10+ HK$20.950 25+ HK$19.160 50+ HK$18.940 100+ HK$18.710 More Pricing...	Total:HK$27.79 Min: 1 / Mult: 1	DD:MM:YYYY	ss:mm:hh	RTC	2V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
PCA2129T/Q900/2,51	2427480RL Data Sheet RoHS	NXP Calendar Clock IC Year/Month/Week/Date/Hr/Min/Sec Binary I2C SPI 1.8 V to 4.2 V SOIC-16	Each (Supplied on Cut Tape) Re-Reel Packaging Options	100+ HK$31.330 250+ HK$29.840 500+ HK$28.940	Total:HK$3,133.00 Min: 100 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1.8V	4.2V	SOIC	16Pins	I2C, SPI	-40°C	85°C	-	-
X1B0002420001	2445807 Data Sheet RoHS	EPSON RTC IC Calendar 1.6 V to 5.5 V SOP 8Pins I2C	Each (Supplied on Cut Tape) Cut Tape	1+ HK$20.780 10+ HK$20.370 25+ HK$19.950 50+ HK$19.540 100+ HK$19.120 More Pricing...	Total:HK$20.78 Min: 1 / Mult: 1	-	-	Alarm RTC	1.6V	5.5V	SOP	8Pins	I2C	-40°C	85°C	-	-
PCF8563TS/5,118	2775932 Data Sheet RoHS	NXP Real Time Clock/Calendar IC Alarm I2C HH:MM:SS Day; Date; Month; Year 1 V to 5.5 V TSSOP-8	Each (Supplied on Cut Tape) Cut Tape	1+ HK$10.330 10+ HK$7.480 50+ HK$6.780 100+ HK$6.000 250+ HK$5.630 More Pricing...	Total:HK$10.33 Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	Alarm RTC	1V	5.5V	TSSOP	8Pins	I2C	-40°C	85°C	-	-
PCF2127T/2Y	2775934 Data Sheet RoHS	NXP Calendar Clock IC Format (YYYY:MM:WK:DD:hh:mm:ss/Binary) I2C SPI 1.8V to 4.2V supply SOIC-16	Each (Supplied on Cut Tape) Cut Tape	1+ HK$37.540 10+ HK$29.760 25+ HK$27.710 50+ HK$26.810 100+ HK$25.910 More Pricing...	Total:HK$37.54 Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1.8V	4.2V	SOIC	16Pins	I2C, SPI	-40°C	85°C	-	-
MCP7940MT-I/SN	2901506 Data Sheet RoHS	MICROCHIP RTC Alarm RTC Date Time Format (Day/Date/Month/Year HH:MM:SS) I2C 1.8V to 5.5V Supply SOIC-8	Each (Supplied on Cut Tape) Cut Tape	1+ HK$7.770 25+ HK$6.800 100+ HK$5.630	Total:HK$7.77 Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS	Alarm RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
M41T94MH6F	2806842 Data Sheet RoHS	STMICROELECTRONICS RTC Date Time Format (Day/Date/Month/Year/Century HH:MM:SS:hh) SPI 2.7V to 5.5V Supply SOH-28	Each (Supplied on Cut Tape) Cut Tape	1+ HK$82.850 10+ HK$64.640 25+ HK$60.020 50+ HK$58.850 100+ HK$57.680 More Pricing...	Total:HK$82.85 Min: 1 / Mult: 1	Day; Date; Month; Year; Century	HH:MM:SS:hh	Alarm RTC	2.7V	5.5V	SOH	28Pins	SPI	-40°C	85°C	-	-
M48T37V-10MH1F	3129609 Data Sheet RoHS	STMICROELECTRONICS RTC Date Time Format (Day/Date/Month/Year/Century HH:MM:SS) Parallel 3V to 3.6V Supply SOIC-44	Each (Supplied on Cut Tape) Cut Tape	1+ HK$198.170 10+ HK$158.930 25+ HK$149.180 50+ HK$143.800 100+ HK$138.420	Total:HK$198.17 Min: 1 / Mult: 1	Day; Date; Month; Year; Century	HH:MM:SS	RTC	3V	3.6V	SOIC	44Pins	Parallel	0°C	70°C	-	-
M41T93ZMY6F	3129790 Data Sheet RoHS	STMICROELECTRONICS RTC Date Time Format (Day/Date/Month/Year/Century HH:MM:SS) SPI 2.38V to 5.5V Supply SOIC-18	Each (Supplied on Cut Tape) Cut Tape	1+ HK$79.770 10+ HK$62.070 25+ HK$57.630 50+ HK$56.480 100+ HK$55.330 More Pricing...	Total:HK$79.77 Min: 1 / Mult: 1	Day; Date; Month; Year; Century	HH:MM:SS	RTC	2.38V	5.5V	SOIC	18Pins	SPI	-40°C	85°C	-	-
PCF2127AT/2Y	2400449 Data Sheet RoHS	NXP Calendar Clock IC Format (YYYY:MM:WK:DD:hh:mm:ss/Binary) I2C SPI 1.8V to 4.2V supply SOIC-20	Each (Supplied on Cut Tape) Cut Tape	1+ HK$41.960 10+ HK$31.870 25+ HK$29.460 50+ HK$28.100 100+ HK$26.730 More Pricing...	Total:HK$41.96 Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1.8V	4.2V	SOIC	20Pins	I2C, SPI	-40°C	85°C	-	-
M41T56M6F	2463679 Data Sheet RoHS	STMICROELECTRONICS RTC IC Date Time Format (Date/Month/Year ss:mm:hh) I2C 4.5 V to 5.5 V SOIC-8	Each (Supplied on Cut Tape) Cut Tape	5+ HK$17.960 50+ HK$16.660 100+ HK$15.360 500+ HK$14.760 1000+ HK$14.350	Total:HK$89.80 Min: 5 / Mult: 5	DD:MM:YYYY	ss:mm:hh	RTC	4.5V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
PCF8523TS/1,118	2427485 Data Sheet RoHS	NXP Calendar Clock IC Year/Month/Week/Date/Hr/Min/Sec Binary I2C 1.2 V to 5.5 V TSSOP-14	Each (Supplied on Cut Tape) Cut Tape	1+ HK$12.580 10+ HK$9.420 50+ HK$8.650 100+ HK$7.720 250+ HK$7.300 More Pricing...	Total:HK$12.58 Min: 1 / Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1.2V	5.5V	TSSOP	14Pins	I2C	-40°C	85°C	-	-
M48T58Y-70MH1F	2849896 Data Sheet RoHS	STMICROELECTRONICS RTC Clock/Calendar Date Time Format (YY-MM-DD-dd HH:MM:SS) Parallel 4.5V to 5.5V SOIC-28	Each (Supplied on Cut Tape) Cut Tape	1+ HK$175.260 10+ HK$140.040 25+ HK$131.230 50+ HK$129.930 100+ HK$128.620	Total:HK$175.26 Min: 1 / Mult: 1	YY-MM-DD-dd	HH:MM:SS	Calendar, Clock	4.5V	5.5V	SOIC	28Pins	Parallel	0°C	70°C	-	-
PCF85363ATL/AX	2890044 Data Sheet RoHS	NXP Real Time Clock/Calendar IC I2C 900 mV to 5.5 V HH:MM:SS: 12Hr / 24Hr YY-MM-DD-DW DFN2626-10	Each (Supplied on Cut Tape) Cut Tape	1+ HK$11.120 10+ HK$8.210 50+ HK$7.630 100+ HK$6.890 250+ HK$6.470 More Pricing...	Total:HK$11.12 Min: 1 / Mult: 1	YY-MM-DD-DW	HH:MM:SS: 12Hr / 24Hr	Calendar, Clock	900mV	5.5V	DFN2626	10Pins	I2C	-40°C	85°C	-	-
PCA85063ATT/AJ	2890041 Data Sheet RoHS	NXP RTC Date Time Format (YY-MM-DD-dd HH:MM:SS) I2C 1.8V to 5.5V Supply TSSOP-8	Each (Supplied on Cut Tape) Cut Tape	1+ HK$12.830 10+ HK$9.380 50+ HK$8.380 100+ HK$7.570 250+ HK$7.110 More Pricing...	Total:HK$12.83 Min: 1 / Mult: 1	YY-MM-DD-dd	HH:MM:SS	RTC	1.8V	5.5V	TSSOP	8Pins	I2C	-40°C	105°C	-	AEC-Q100
MCP79512-I/MS	2810108 Data Sheet RoHS	MICROCHIP Calendar Clock IC Day/Date/Month/Year hh:mm:ss:hh Serial SPI 1.8 V to 3.6 V supply MSOP-10	Each	1+ HK$11.890 25+ HK$10.960 100+ HK$10.440	Total:HK$11.89 Min: 1 / Mult: 1	Day; Date; Month; Year	HH:MM:SS:hh	Calendar, Clock	1.8V	3.6V	MSOP	10Pins	Serial SPI	-40°C	85°C	-	-
M41ST85WMH6F	2849893 Data Sheet RoHS	STMICROELECTRONICS RTC Clock/Calendar Day/Date/Month/Year/Century HH:MM:SS I2C Serial 2.7V to 3.6V SOIC-28	Each (Supplied on Cut Tape) Cut Tape	1+ HK$86.100 10+ HK$67.290 25+ HK$62.500 50+ HK$59.900 100+ HK$57.290 More Pricing...	Total:HK$86.10 Min: 1 / Mult: 1	Day; Date; Month; Year; Century	HH:MM:SS	Calendar, Clock	2.7V	3.6V	SOIC	28Pins	I2C, Serial	-40°C	85°C	-	-
MCP7940NT-I/MNY	2851655 Data Sheet RoHS	MICROCHIP RTC Clock/Calendar Date Time Format (YY-MM-DD-dd HH:MM:SS) I2C 1.8V to 5.5V Supply TDFN-8	Each (Supplied on Cut Tape) Cut Tape	1+ HK$12.530 25+ HK$10.960 100+ HK$9.080 3300+ HK$8.140	Total:HK$12.53 Min: 1 / Mult: 1	YY-MM-DD-dd	HH:MM:SS	RTCC	1.8V	5.5V	TDFN	8Pins	I2C	-40°C	85°C	-	-
X1B0003010001	3253613 Data Sheet RoHS	EPSON RTC -40 TO 85DEG C	Each (Supplied on Cut Tape) Cut Tape	1+ HK$42.260 10+ HK$41.430 25+ HK$40.570 50+ HK$39.740 100+ HK$38.880 More Pricing...	Total:HK$42.26 Min: 1 / Mult: 1	YY-MM-DD-dd	HH:MM:SS	RTC	1.6V	5.5V	-	10Pins	I2C	-40°C	85°C	-	-