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. 189-8655
FabrikantnummerDS1305E+
FabrikantMaxim Integrated
4,645 €
Each (In a Pack of 2)
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. 191-3664
FabrikantnummerDS1307ZN+T&R
FabrikantMaxim Integrated
2,67 €
Each (In a Pack of 5)
Aantal stuks
NV SRAM, Real Time Clock DM:M:DW:Y SS:MM:HH - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 4.5 V +85 °C
RS-stocknr. 189-8629
FabrikantnummerDS1338Z-33+
FabrikantMaxim Integrated
3,11 €
Each (In a Pack of 5)
Aantal stuks
Battery Backup, Calendar, NV RAM 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 +85 °C
RS-stocknr. 189-7254
FabrikantnummerDS3234S#
FabrikantMaxim Integrated
6,092 €
Each (In a Tube of 36)
Aantal stuks
SRAM DD:M:Y SS:MM:HH 256B Serial-SPI Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 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. 169-8136
FabrikantnummerQ42724231000711
FabrikantEPSON
5,289 €
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. 761-9755
FabrikantnummerDS1302ZN+T&R
FabrikantMaxim Integrated
3,49 €
Each
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 +85 °C
RS-stocknr. 190-4746
FabrikantnummerDS1683S+
FabrikantMaxim Integrated
2,796 €
Each (In a Tube of 100)
Aantal stuks
Alarm, SRAM - - - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 190-5136
FabrikantnummerDS1390U-33+T&R
FabrikantMaxim Integrated
2,698 €
Each (In a Pack of 5)
Aantal stuks
Trickle Charger D:D:M:Y - - Serial-SPI Surface Mount μSOP 10 3.16 x 3.12 x 0.95mm 3.16mm 3.12mm 0.95mm 5.5 V +85 °C
RS-stocknr. 177-0656
FabrikantnummerMCP79400-I/MS
FabrikantMicrochip
0,727 €
Each (In a Pack of 10)
Aantal stuks
- D:M:Y, DW HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 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. 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. 189-7221
FabrikantnummerDS1337U+
FabrikantMaxim Integrated
1,762 €
Each (In a Tube of 50)
Aantal stuks
Real Time Clock D:D:M:Y:C SS:MM:HH - 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. 923-7472
FabrikantnummerDS1339U-33+T&R
FabrikantMaxim Integrated
1,784 €
Each (On a Reel of 3000)
Aantal stuks
Battery Backup, Calendar YY:MM:DD 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. 817-3654
FabrikantnummerMCP79410T-I/MS
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 MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
RS-stocknr. 171-1640
FabrikantnummerRV-3049-C2-TB-008
FabrikantMicro Crystal
9,78 €
Each (On a Tape of 100)
Aantal stuks
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 8B Serial-SPI Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +125 °C
RS-stocknr. 190-5806
FabrikantnummerDS1339BU+
FabrikantMaxim Integrated
2,835 €
Each (In a Pack of 2)
Aantal stuks
Real Time Clock D:D: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. 189-7245
FabrikantnummerDS1746-70+
FabrikantMaxim Integrated
25,117 €
Each (In a Tube of 11)
Aantal stuks
Calendar YY:MM:DD HH:MM:SS 128 x 8bit Parallel Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 44.2mm 18.8mm 10.92mm 0.8 V, 5.3 V +70 °C
RS-stocknr. 177-0303
FabrikantnummerMCP79401-I/SN
FabrikantMicrochip
0,694 €
Each (In a Tube of 100)
Aantal stuks
- D:M:Y, DW HH:MM:SS - 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. 889-6026
FabrikantnummerMCP7940NT-I/MNY
FabrikantMicrochip
0,627 €
Each (On a Reel of 3300)
Aantal stuks
Calendar, Clock DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount TDFN 8 3 x 2 x 0.75mm 3mm 2mm 0.75mm 5.5 V +85 °C