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. 920-8991
14,908 €
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. 190-5162
FabrikantMaxim Integrated
2,894 €
Each (In a Pack of 5)
Aantal stuks
Alarm, Binary Counter, Real Time Clock - - - Serial-I2C, Serial-SPI 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. 189-8643
FabrikantMaxim Integrated
3,87 €
Each (In a Pack of 2)
Aantal stuks
Trickle Charger DD:M:Y SS:MM:HH - Serial-SPI Surface Mount μMAX 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 3.3 V +85 °C
RS-stocknr. 907-4732
6,985 €
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. 171-1647
FabrikantMicro Crystal
6,041 €
Each (On a Tape of 100)
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS - 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. 190-5143
FabrikantMaxim Integrated
3,09 €
Each (In a Pack of 5)
Aantal stuks
Real Time Clock, Trickle Charger D:D:M:Y SS:MM:HH - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 169-8136
5,664 €
Each (In a Tube of 25)
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS - Parallel Surface Mount SOP 24 16.3 x 7.9 x 2.8mm 16.3mm 7.9mm 2.8mm 5.5 V +85 °C
RS-stocknr. 190-5133
FabrikantMaxim Integrated
3,566 €
Each (In a Pack of 5)
Aantal stuks
Clock, Real Time Clock, Trickle Charger D:D:M:Y SS:MM:HH - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 191-4210
FabrikantMaxim Integrated
19,02 €
Aantal stuks
Real Time Clock - - - Serial-I2C Surface Mount - 6 - - - - - +85 °C