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. 190-5143
FabrikantnummerDS1340Z-33+T&R
FabrikantMaxim Integrated
2,698 €
Each (In a Pack of 5)
Aantal stuks
Real Time Clock, Trickle Charger D:D:M:Y SS:MM:HH - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 177-0876
FabrikantnummerMCP79412-I/MS
FabrikantMicrochip
0,864 €
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. 189-8698
FabrikantnummerDS1337+
FabrikantMaxim Integrated
2,558 €
Each (In a Pack of 5)
Aantal stuks
Clock DD:M:Y SS:MM:HH 7B 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. 171-0195
FabrikantnummerAB0805-T3
FabrikantAbracon
0,676 €
Each (On a Reel of 3000)
Aantal stuks
- - - - - Surface Mount 16-VFQFN - - - - - - 85 °C
RS-stocknr. 518-299
FabrikantnummerISL12026IBZ
FabrikantIntersil
2,73 €
Each
Aantal stuks
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 512B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 188-9205
FabrikantnummerM41T80M6F
0,967 €
Each (On a Reel of 2500)
Aantal stuks
Alarm, Calendar Binary, D:D:M:Y:C - - 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. 786-0745
FabrikantnummerDS1307N+
FabrikantMaxim Integrated
3,395 €
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. 205-3456
FabrikantnummerX1B000311000112
FabrikantEpson
0,927 €
Each (On a Reel of 250)
Aantal stuks
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS-stocknr. 912-6738
FabrikantnummerMCP79411-I/SN
FabrikantMicrochip
0,758 €
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. 165-5488
FabrikantnummerM41T93RMY6F
1,925 €
Each (On a Reel of 1000)
Aantal stuks
Real Time Clock DW:DM:M:Y HH:MM:SS:hh 32B Serial-4 Wire, Serial-I2C Surface Mount SOX 18 11.66 x 7.67 x 2.39mm 11.66mm 7.67mm 2.39mm 5.5 V +85 °C
RS-stocknr. 205-3455
FabrikantnummerX1B000242000112
FabrikantEpson
1,356 €
Each (In a Pack of 5)
Aantal stuks
Real Time Clock - - 128bit - - SOP-14 14 - - - - - -
RS-stocknr. 190-5205
FabrikantnummerDS1744-70IND+
FabrikantMaxim Integrated
26,51 €
Each
Aantal stuks
NV SRAM, Real Time Clock Y:M:D:D HH:MM:SS - - Through Hole EDIP 28 39.37 x 18.80 x 10.67mm 39.37mm 18.8mm 10.67mm 5 V +85 °C
RS-stocknr. 192-1456
FabrikantnummerDS12C887A+
FabrikantMaxim Integrated
8,18 €
Each
Aantal stuks
Alarm, Calendar YY:MM:DD HH:MM:SS 128B Multiplexed Through Hole EDIP 24 38.1 x 18.29 x 10.67mm 38.1mm 18.29mm 10.67mm 5.5 V +85 °C
RS-stocknr. 189-8496
FabrikantnummerDS1307N+
FabrikantMaxim Integrated
3,385 €
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. 624-8438
FabrikantnummerM41T62Q6F
1,72 €
Each (In a Pack of 5)
Aantal stuks
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS:hh 16B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
RS-stocknr. 190-5835
FabrikantnummerDS1339C-33#T&R
FabrikantMaxim Integrated
4,965 €
Each (In a Pack of 2)
Aantal stuks
Alarm, Clock, Real Time Clock, Square Wave Output, Trickle Charger DM:M:DW: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. 189-8509
FabrikantnummerDS1338U-33+
FabrikantMaxim Integrated
3,056 €
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 μSOP 8 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS-stocknr. 191-3235
FabrikantnummerDS1374U-33+T&R
FabrikantMaxim Integrated
1,414 €
Each (On a Reel of 3000)
Aantal stuks
Binary Counter, Real Time Clock, Trickle Charger - - - Serial-I2C 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. 189-8394
FabrikantnummerDS3231S#
FabrikantMaxim Integrated
7,16 €
Each
Aantal stuks
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SOIC 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +70 °C
RS-stocknr. 823-3712
FabrikantnummerMCP7940N-I/ST
FabrikantMicrochip
0,66 €
Each (In a Pack of 10)
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