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. 540-2704
FabrikantnummerDS1302+
FabrikantMaxim Integrated
3,53 €
Each
Aantal stuks
Alarm, Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 31B Serial 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. 923-7494
FabrikantnummerDS1302Z+T&R
FabrikantMaxim Integrated
1,555 €
Each (On a Reel of 2500)
Aantal stuks
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 31B Serial-3 Wire Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +70 °C
RS-stocknr. 189-8391
FabrikantnummerDS3231MZ+
FabrikantMaxim Integrated
6,365 €
Each (In a Pack of 2)
Aantal stuks
Battery Backup, Calendar Binary HH:MM:SS - Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 786-0745
FabrikantnummerDS1307N+
FabrikantMaxim Integrated
3,24 €
Each (In a Pack of 2)
Aantal stuks
Clock DM:M:DW:Y SS:MM:HH 56B Serial-I2C Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +85 °C
RS-stocknr. 196-9062
FabrikantnummerISL12020MIRZ
4,511 €
Each (In a Tube of 53)
Aantal stuks
- DW:DM:M:Y HH:MM:SS 128B - - DFN 20 - - - - - -
RS-stocknr. 189-7510
FabrikantnummerDS1307Z+
FabrikantMaxim Integrated
2,252 €
Each (In a Tube of 100)
Aantal stuks
Alarm, Battery Backup, Calendar, Power Fail DW:DM:M:Y HH:MM:SS 56B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +70 °C
RS-stocknr. 667-6224
FabrikantnummerQ42724231000711
FabrikantEPSON
5,82 €
Each
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. 190-4744
FabrikantnummerDS1672U-33+
FabrikantMaxim Integrated
1,98 €
Each (In a Tube of 50)
Aantal stuks
Binary Counter, Real Time Clock - - - 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. 196-9064
FabrikantnummerISL12022IBZ
3,174 €
Each (In a Tube of 98)
Aantal stuks
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
RS-stocknr. 904-7519
FabrikantnummerX1B000301000212
FabrikantEPSON
2,09 €
Each
Aantal stuks
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-stocknr. 732-7371
FabrikantnummerDS1371U+
FabrikantMaxim Integrated
2,59 €
Each
Aantal stuks
Calendar, NV RAM Binary Binary 3B 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. 829-0399
FabrikantnummerM41T11M6F
2,91 €
Each (In a Pack of 5)
Aantal stuks
Calendar D:D:M:Y:C HH:MM:SS 56B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 192-1541
FabrikantnummerDS1338Z-18+
FabrikantMaxim Integrated
3,11 €
Each (In a Pack of 2)
Aantal stuks
Calendar YY:MM:DD HH:MM:SS 56B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 145-9048
FabrikantnummerMCP7940N-I/ST
FabrikantMicrochip
0,605 €
Each (In a Tube of 100)
Aantal stuks
Calendar DW:D:M:Y HH:MM:SS 64B Serial-I2C Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 4.5mm 3.1mm 1.05mm 5.5 V +85 °C
RS-stocknr. 729-3375
FabrikantnummerRV-8564-C2-TA-020
FabrikantMicro Crystal
2,55 €
Each
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
RS-stocknr. 189-8627
FabrikantnummerDS1306+
FabrikantMaxim Integrated
5,125 €
Each (In a Pack of 2)
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. 809-1420
FabrikantnummerM41T81M6F
2,196 €
Each (In a Pack of 5)
Aantal stuks
Alarm Binary HH:MM:SS:hh 20B Serial Surface Mount SOIC 8 5 x 4 x 1.25mm 5mm 4mm 1.25mm 5.5 V +85 °C
RS-stocknr. 191-5234
FabrikantnummerDS1685S-5+
FabrikantMaxim Integrated
4,308 €
Each (In a Tube of 30)
Aantal stuks
NV SRAM, Real Time Clock - - 242B Multiplexed Surface Mount SO 24 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm 2.35mm 5.5 V +70 °C
RS-stocknr. 921-5964
FabrikantnummerISL12022MIBZ
6,185 €
Each (In a Pack of 2)
Aantal stuks
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-stocknr. 817-3667
FabrikantnummerMCP79410T-I/ST
FabrikantMicrochip
0,726 €
Each (On a Reel of 2500)
Aantal stuks
Alarm, Battery Backup, Calendar, Clock DW:D:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 3.1mm 4.5mm 1.05mm 5.5 V +85 °C