Real Time Clocks

What is a Real Time Clock?

A Real Time Clock (RTC) is a computer clock which is usually in the form of an integrated circuit. They have been designed to keep track of time, in real time - hence the product name. A Real Time Clock is usually an integral part of the computer motherboard. More often than not, an RTC will also include a calendar and an alarm

How do Real Time Clocks work?

The memory on the clocks system stores system descriptions and set up values such as "Current Time Value". The information that is held in the RTC is read with a microprocessor, commonly over a serial interface which facilitates the performance of the software functions that are time dependant.

Designed to run on ultra-low power consumption, RTCs often run on a lithium battery source but can also run on normal power. This power source allows them to continue running and generating real time when a system is down. The newer models of RTC use super-capacitors as a source of power that can be recharged and soldered to the board. Some Real Time Clocks feature synchronisation to an external signal, such as a compensated power line frequency. It allows the device to provide an accurate result without having an on-board temperature compensation scheme.

RTC Time Values

  • Year
  • Month
  • Date
  • Hours
  • Minutes
  • Seconds

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Omschrijving Prijs Functions Date Format Time Format User RAM Bus Type Mounting Type Package Type Pin Count Dimensions Length Width Height Maximum Operating Supply Voltage Maximum Operating Temperature
RS-stocknr. 177-0876
FabrikantnummerMCP79412-I/MS
FabrikantMicrochip
0,864 €
Each (In a Pack of 10)
Aantal stuks
- D:M:Y, DW HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
RS-stocknr. 177-0656
FabrikantnummerMCP79400-I/MS
FabrikantMicrochip
0,727 €
Each (In a Pack of 10)
Aantal stuks
- D:M:Y, DW HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
RS-stocknr. 100-0649
FabrikantnummerISL1208IU8Z-T7A
FabrikantIntersil
3,67 €
Each (On a Tape of 2)
Aantal stuks
Alarm, Calendar, Clock, SRAM DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS-stocknr. 189-7195
FabrikantnummerDS12887A+
FabrikantMaxim Integrated
7,571 €
Each (In a Tube of 14)
Aantal stuks
Real Time Clock D:D:M:Y:C SS:MM:HH 114B - Surface Mount PDIP 24 32.26 x 14.61 x 4.45mm 32.26mm 14.61mm 4.45mm 5.5 V +85 °C
RS-stocknr. 146-0221
FabrikantnummerMCP79521-I/MS
FabrikantMicrochip
0,909 €
Each (In a Tube of 100)
Aantal stuks
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS-stocknr. 189-7238
FabrikantnummerDS1391U-33+
FabrikantMaxim Integrated
2,502 €
Each (In a Tube of 50)
Aantal stuks
Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS - Serial-SPI Surface Mount μSOP 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS-stocknr. 761-9711
FabrikantnummerDS1339U-33+T&R
FabrikantMaxim Integrated
3,40 €
Each
Aantal stuks
Battery Backup, Calendar YY:MM:DD HH:MM:SS - Serial-I2C Surface Mount μSOP 8 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS-stocknr. 196-9070
FabrikantnummerISL1208IB8Z-TK
2,154 €
Each (In a Pack of 5)
Aantal stuks
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
RS-stocknr. 189-7234
FabrikantnummerDS1388Z-33+
FabrikantMaxim Integrated
3,231 €
Each (In a Tube of 100)
Aantal stuks
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 512B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 3.63 V +85 °C
RS-stocknr. 920-9007
FabrikantnummerM41T62Q6F
0,82 €
Each (On a Reel of 3000)
Aantal stuks
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS:hh 16B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
RS-stocknr. 171-0537
FabrikantnummerAB1815-T3
FabrikantAbracon
0,624 €
Each (In a Pack of 5)
Aantal stuks
- - - - - Surface Mount 16-VFQFN - - - - - - 85 °C
RS-stocknr. 829-0355
FabrikantnummerM41T81SM6F
2,242 €
Each (In a Pack of 5)
Aantal stuks
Calendar D:D:M:Y:C HH:MM:SS:HSS 20B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 919-6337
FabrikantnummerM48T18-100PC1
15,319 €
Each (In a Tube of 12)
Aantal stuks
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 8192B Parallel Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 39.88mm 18.34mm 8.89mm 5.5 V +70 °C
RS-stocknr. 191-3234
FabrikantnummerDS1337U+T&R
FabrikantMaxim Integrated
1,099 €
Each (On a Reel of 3000)
Aantal stuks
Real Time Clock D:D:M:Y SS:MM:HH - Serial-I2C Surface Mount μSOP 8 3.1 x 0.65 x 0.95mm 3.1mm 0.65mm 0.95mm 5.5 V +85 °C
RS-stocknr. 189-7212
FabrikantnummerDS1307+
FabrikantMaxim Integrated
2,709 €
Each (In a Tube of 50)
Aantal stuks
Alarm, Battery Backup, Calendar, Power Fail DW:DM:M:Y HH:MM:SS 56B Serial-I2C Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +70 °C
RS-stocknr. 690-2848
FabrikantnummerRV-3049-C2-STD-025
FabrikantMicro Crystal
5,19 €
Each
Aantal stuks
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS 8B Serial-SPI Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
RS-stocknr. 907-4732
FabrikantnummerM41ST87WMX6TR
6,35 €
Each (In a Pack of 2)
Aantal stuks
Calendar, Clock DD:MM:YY HH:MM:SS 128B Serial-I2C Surface Mount SOX 28 18.01 x 7.67 x 2.38mm 18.01mm 7.67mm 2.38mm 3.6 V +85 °C
RS-stocknr. 205-3458
FabrikantnummerX1B000371000112
FabrikantEpson
2,656 €
Each (On a Reel of 250)
Aantal stuks
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS-stocknr. 146-0283
FabrikantnummerMCP79411-I/MS
FabrikantMicrochip
0,78 €
Each (In a Tube of 100)
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
RS-stocknr. 178-0558
FabrikantnummerBU9873NUX-TTR
FabrikantROHM
0,714 €
Each (In a Pack of 10)
Aantal stuks
Real Time Clock YY:MM:DD:DW HH:MM:SS - Serial-I2C Surface Mount VSON008X2030 8 2 x 3 x 0.58mm 2mm 3mm 0.85mm 5.5 V +85 °C