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	I2C	HH:MM:SS	Day; Date; Month; Year	Alarm RTC	HH:MM:SS	1.4V	3.6V	MSOP	MSOP	I2C	8Pins	-	-	-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	I2C	Binary	YYYY:MM:WK:DD:Hr:Min:Secs	Calendar, Clock	Binary	1.1V	5.5V	HVQFN	HVQFN	I2C	16Pins	-	-	-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	I2C	Binary	YYYY:MM:WK:DD:Hr:Min:Secs	Calendar, Clock	Binary	900mV	5.5V	SOIC	SOIC	I2C	8Pins	-	-	-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	SPI	HH:MM:SS:hh	Day; Date; Month; Year; Century	Alarm RTC	HH:MM:SS:hh	2.7V	5.5V	SOIC	SOIC	SPI	16Pins	-	-	-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	I2C	HH:MM:SS:hh	Day; Date; Month; Year; Century	Alarm RTC	HH:MM:SS:hh	2V	5.5V	SOIC	SOIC	I2C	8Pins	-	-	-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	SPI	24Hr	YYYY:MM:DD:Hr:Min:Secs	RTC	24Hr	1.3V	5.5V	SON	SON	SPI	10Pins	-	-	-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	I2C	ss:mm:hh	DD:MM:YYYY	RTC	ss:mm:hh	2V	5.5V	SOIC	SOIC	I2C	8Pins	-	-	-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	I2C, SPI	Binary	YYYY:MM:WK:DD:Hr:Min:Secs	Calendar, Clock	Binary	1.8V	4.2V	SOIC	SOIC	I2C, SPI	16Pins	-	-	-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	I2C	-	-	Alarm RTC	-	1.6V	5.5V	SOP	SOP	I2C	8Pins	-	-	-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	I2C	HH:MM:SS	Day; Date; Month; Year	Alarm RTC	HH:MM:SS	1V	5.5V	TSSOP	TSSOP	I2C	8Pins	-	-	-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	I2C, SPI	Binary	YYYY:MM:WK:DD:Hr:Min:Secs	Calendar, Clock	Binary	1.8V	4.2V	SOIC	SOIC	I2C, SPI	16Pins	-	-	-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	I2C	HH:MM:SS	Day; Date; Month; Year	Alarm RTC	HH:MM:SS	1.8V	5.5V	SOIC	SOIC	I2C	8Pins	-	-	-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	SPI	HH:MM:SS:hh	Day; Date; Month; Year; Century	Alarm RTC	HH:MM:SS:hh	2.7V	5.5V	SOH	SOH	SPI	28Pins	-	-	-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	Parallel	HH:MM:SS	Day; Date; Month; Year; Century	RTC	HH:MM:SS	3V	3.6V	SOIC	SOIC	Parallel	44Pins	-	-	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	SPI	HH:MM:SS	Day; Date; Month; Year; Century	RTC	HH:MM:SS	2.38V	5.5V	SOIC	SOIC	SPI	18Pins	-	-	-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	I2C, SPI	Binary	YYYY:MM:WK:DD:Hr:Min:Secs	Calendar, Clock	Binary	1.8V	4.2V	SOIC	SOIC	I2C, SPI	20Pins	-	-	-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	I2C	ss:mm:hh	DD:MM:YYYY	RTC	ss:mm:hh	4.5V	5.5V	SOIC	SOIC	I2C	8Pins	-	-	-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	I2C	Binary	YYYY:MM:WK:DD:Hr:Min:Secs	Calendar, Clock	Binary	1.2V	5.5V	TSSOP	TSSOP	I2C	14Pins	-	-	-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	Parallel	HH:MM:SS	YY-MM-DD-dd	Calendar, Clock	HH:MM:SS	4.5V	5.5V	SOIC	SOIC	Parallel	28Pins	-	-	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	I2C	HH:MM:SS: 12Hr / 24Hr	YY-MM-DD-DW	Calendar, Clock	HH:MM:SS: 12Hr / 24Hr	900mV	5.5V	DFN2626	DFN2626	I2C	10Pins	-	-	-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	I2C	HH:MM:SS	YY-MM-DD-dd	RTC	HH:MM:SS	1.8V	5.5V	TSSOP	TSSOP	I2C	8Pins	-	AEC-Q100	-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	Serial SPI	HH:MM:SS:hh	Day; Date; Month; Year	Calendar, Clock	HH:MM:SS:hh	1.8V	3.6V	MSOP	MSOP	Serial SPI	10Pins	-	-	-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$8.150	Total:HK$12.53 Min: 1 / Mult: 1	I2C	HH:MM:SS	YY-MM-DD-dd	RTCC	HH:MM:SS	1.8V	5.5V	TDFN	TDFN	I2C	8Pins	-	-	-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	I2C, Serial	HH:MM:SS	Day; Date; Month; Year; Century	Calendar, Clock	HH:MM:SS	2.7V	3.6V	SOIC	SOIC	I2C, Serial	28Pins	-	-	-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	I2C	HH:MM:SS	YY-MM-DD-dd	RTC	HH:MM:SS	1.6V	5.5V	-	-	I2C	10Pins	-	-	-40°C	85°C	-