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. 191-3287
FabrikantnummerDS1340C-33#T&R
FabrikantMaxim Integrated
2,622 €
Each (On a Reel of 1000)
Aantal stuks
Clock, Real Time Clock, Trickle Charger D:D:M:Y SS:MM:HH - Serial-I2C Surface Mount SO 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +85 °C
RS-stocknr. 192-1505
FabrikantnummerDS1305N+
FabrikantMaxim Integrated
5,195 €
Each (In a Pack of 2)
Aantal stuks
Alarm, Trickle Charger YY:MM:DD HH:MM:SS 96B Serial-SPI Through Hole PDIP 16 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm 5.5 V +85 °C
RS-stocknr. 171-1656
FabrikantnummerRV-3049-C3-TB-QA-OPT.A
FabrikantMicro Crystal
5,406 €
Each (On a Tape of 100)
Aantal stuks
Alarm, Battery Backup, Calendar, Clock D:W:M:Y HH:MM:SS 8B Serial-4 Wire, Serial-SPI Surface Mount SON 10 3.7 x 2.5 x 0.9mm 3.7mm 2.5mm 0.9mm 5.5 V +85 °C
RS-stocknr. 188-9206
FabrikantnummerM41T82RM6F
1,07 €
Each (On a Reel of 2500)
Aantal stuks
Alarm, Battery Backup, Calendar, Watchdog Timer Binary, D:D:M:Y:C - 32bit Serial-2 Wire, Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 204-2515
FabrikantnummerMAX31343EKA+
FabrikantMaxim Integrated
2,436 €
Each (On a Tape of 10)
Aantal stuks
Real Time Clock - HH:MM:SS 64B - - WLP 8 - - - - - -
RS-stocknr. 825-1076
FabrikantnummerMCP79510-I/MS
FabrikantMicrochip
0,948 €
Each (In a Pack of 5)
Aantal stuks
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS-stocknr. 189-7209
FabrikantnummerDS1306+
FabrikantMaxim Integrated
4,362 €
Each (In a Tube of 25)
Aantal stuks
Alarm, Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 96B Serial-SPI Through Hole PDIP 16 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm 5.5 V +70 °C
RS-stocknr. 169-8135
FabrikantnummerQ42724231000611
FabrikantEPSON
5,166 €
Each (In a Tube of 25)
Aantal stuks
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-stocknr. 189-7206
FabrikantnummerDS1305E+
FabrikantMaxim Integrated
3,873 €
Each (In a Tube of 74)
Aantal stuks
Alarm, Calendar DW:DM:M:Y HH:MM:SS 96B Serial-SPI Surface Mount TSSOP 20 6.5 x 4.4 x 0.9mm 6.5mm 4.4mm 0.9mm 5.5 V +70 °C
RS-stocknr. 190-4739
FabrikantnummerDS1372U+
FabrikantMaxim Integrated
2,078 €
Each (In a Tube of 50)
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. 189-8326
FabrikantnummerDS1339U-33+
FabrikantMaxim Integrated
3,40 €
Each (In a Pack of 2)
Aantal stuks
Battery Backup, Calendar DW:DM:M:Y 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. 912-2774
FabrikantnummerMCP7940N-I/SN
FabrikantMicrochip
0,572 €
Each (In a Tube of 100)
Aantal stuks
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 4.9mm 3.9mm 1.5mm 5.5 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. 189-8339
FabrikantnummerDS1302N+
FabrikantMaxim Integrated
3,385 €
Each (In a Pack of 2)
Aantal stuks
Trickle Charger DM:M:DW:Y SS:MM:HH 31B Serial-3 Wire Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +85 °C