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

...
Read more Read less

Filters

Viewing 1 - 20 of 22 products
Results per page
Description Price 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 Stock No. 667-6224
Mfr. Part No.Q42724231000711
BrandEPSON
MYR34.09
Each
units
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 Stock No. 667-6252
Mfr. Part No.Q41856471000111
BrandEPSON
MYR18.80
Each
units
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 20 - 7mm 5.4mm - 5.5 V +85 °C
RS Stock No. 904-7519
Mfr. Part No.X1B000301000212
BrandEPSON
MYR25.70
Each
units
Clock - SS:MM - Serial-I2C Surface Mount - 10 3.2 x 2.5 x 1mm 3.2mm 2.5mm 1mm 5.5 V +85 °C
RS Stock No. 667-6221
Mfr. Part No.Q42724231000611
BrandEPSON
MYR41.02
Each
units
Calendar, Timer - - - Serial-I2C Surface Mount SOP 24 16.3 x 7.9 x 2.8mm 16.3mm 7.9mm 2.8mm 5.5 V +85 °C
RS Stock No. 667-6230
Mfr. Part No.Q41454351000111
BrandEPSON
MYR17.48
Each
units
Calendar, Timer - - - Serial Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS Stock No. 169-8134
Mfr. Part No.Q42724211000200
BrandEPSON
MYR31.008
Each (In a Tube of 25)
units
Calendar DW:DM:M:Y HH:MM:SS - Parallel Through Hole PDIP 18 23.1 x 6.3 x 4.2mm 23.1mm 6.3mm 4.2mm 5.5 V +70 °C
RS Stock No. 169-8136
Mfr. Part No.Q42724231000711
BrandEPSON
MYR31.27
Each (In a Tube of 25)
units
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 Stock No. 667-6287
Mfr. Part No.Q418564C2000511
BrandEPSON
MYR18.52
Each
units
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 12 - 3.6mm 2.4mm - 5.5 V +85 °C
RS Stock No. 169-8222
Mfr. Part No.X1B000311000112
BrandEPSON
MYR22.599
Each (On a Tape of 20)
units
Clock - SS:HH 32bit Serial-I2C Surface Mount - 10 3.2 x 2.5 x 1mm 3.2mm 2.5mm 1mm 5.5 V +85 °C
RS Stock No. 169-8135
Mfr. Part No.Q42724231000611
BrandEPSON
MYR35.062
Each (In a Tube of 25)
units
Calendar, Timer - - - Serial-I2C Surface Mount SOP 24 16.3 x 7.9 x 2.8mm 16.3mm 7.9mm 2.8mm 5.5 V +85 °C
RS Stock No. 169-8144
Mfr. Part No.Q41802551000111
BrandEPSON
MYR17.212
Each (On a Reel of 250)
units
Alarm, Calendar, Timer - - - Serial-I2C Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS Stock No. 169-8219
Mfr. Part No.X1B000172000112
BrandEPSON
MYR14.05
Each (On a Reel of 250)
units
Alarm, Calendar, Event Detection and Timestamp, Power Switching, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SOP 14 10.1 x 5 x 3.15mm 10.1mm 5mm 3.15mm 5.5 V +85 °C
RS Stock No. 169-8137
Mfr. Part No.Q41454351000111
BrandEPSON
MYR16.027
Each (On a Reel of 250)
units
Calendar, Timer - - - Serial Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS Stock No. 904-7512
Mfr. Part No.X1B000311000112
BrandEPSON
MYR24.20
Each
units
Clock - SS:HH 32bit Serial-I2C Surface Mount - 10 3.2 x 2.5 x 1mm 3.2mm 2.5mm 1mm 5.5 V +85 °C
RS Stock No. 169-8141
Mfr. Part No.Q41856471000111
BrandEPSON
MYR17.475
Each (On a Reel of 250)
units
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 20 - 7mm 5.4mm - 5.5 V +85 °C
RS Stock No. 667-6278
Mfr. Part No.Q41802551000111
BrandEPSON
MYR19.01
Each
units
Alarm, Calendar, Timer - - - Serial-I2C Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS Stock No. 667-6212
Mfr. Part No.Q42724211000200
BrandEPSON
MYR33.40
Each
units
Calendar DW:DM:M:Y HH:MM:SS - Parallel Through Hole PDIP 18 23.1 x 6.3 x 4.2mm 23.1mm 6.3mm 4.2mm 5.5 V +70 °C
RS Stock No. 169-8145
Mfr. Part No.Q418564C2000511
BrandEPSON
MYR16.797
Each (On a Reel of 250)
units
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 12 - 3.6mm 2.4mm - 5.5 V +85 °C
RS Stock No. 169-8223
Mfr. Part No.X1B000301000212
BrandEPSON
MYR25.70
Each (On a Reel of 250)
units
Clock - SS:MM - Serial-I2C Surface Mount - 10 3.2 x 2.5 x 1mm 3.2mm 2.5mm 1mm 5.5 V +85 °C
RS Stock No. 667-6243
Mfr. Part No.Q41457451000200
BrandEPSON
MYR15.88
Each
units
Alarm, Calendar, Timer - - - Serial Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C