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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Viewing 1 - 14 of 14 products
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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. 921-5721
Mfr. Part No.ISL12020MIRZ
HK$55.61
Each (In a Pack of 2)
units
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 128B Serial-I2C Surface Mount DFN 20 5.5 x 4 x 1.3mm 5.5mm 4mm 1.3mm 5.5 V +85 °C
RS Stock No. 196-9066
Mfr. Part No.ISL12057IUZ
HK$18.69
Each (In a Tube of 50)
units
- DW:DM:M:Y HH:MM:SS - - - MSOP 8 - - - - - -
RS Stock No. 923-1499
Mfr. Part No.ISL12020MIRZ
HK$48.878
Each (In a Tube of 53)
units
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 128B Serial-I2C Surface Mount DFN 20 5.5 x 4 x 1.3mm 5.5mm 4mm 1.3mm 5.5 V +85 °C
RS Stock No. 642-3106
Mfr. Part No.CDP68HC68T1MZ
HK$91.54
Each
units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS 32B Serial-SPI Surface Mount SOIC W 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 6 V +85 °C
RS Stock No. 196-9063
Mfr. Part No.ISL12020MIRZ
HK$55.61
Each (In a Pack of 2)
units
- DW:DM:M:Y HH:MM:SS 128B - - DFN 20 - - - - - -
RS Stock No. 921-5396
Mfr. Part No.CDP68HC68T1M2Z
HK$108.60
Each
units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS 32B Serial-SPI Surface Mount SOIC W 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 6 V +85 °C
RS Stock No. 196-9070
Mfr. Part No.ISL1208IB8Z-TK
HK$22.382
Each (In a Pack of 5)
units
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
RS Stock No. 196-9065
Mfr. Part No.ISL12022IBZ
HK$39.75
Each (In a Pack of 2)
units
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
RS Stock No. 921-5964
Mfr. Part No.ISL12022MIBZ
HK$55.79
Each (In a Pack of 2)
units
Alarm, Battery Backup, Calendar, Low Battery Detection DW:DM:M:Y SS:MM:HH 128B Serial-I2C Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +85 °C
RS Stock No. 196-9064
Mfr. Part No.ISL12022IBZ
HK$33.753
Each (In a Tube of 98)
units
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
RS Stock No. 196-9062
Mfr. Part No.ISL12020MIRZ
HK$47.946
Each (In a Tube of 53)
units
- DW:DM:M:Y HH:MM:SS 128B - - DFN 20 - - - - - -
RS Stock No. 921-5532
Mfr. Part No.CDP68HC68T1MZ
HK$102.56
Each
units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS 32B Serial-SPI Surface Mount SOIC W 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 6 V +85 °C
RS Stock No. 196-9068
Mfr. Part No.ISL12057IUZ
HK$21.588
Each (In a Pack of 5)
units
- DW:DM:M:Y HH:MM:SS - - - MSOP 8 - - - - - -
RS Stock No. 196-9069
Mfr. Part No.ISL1208IB8Z-TK
HK$10.928
Each (On a Reel of 1000)
units
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -