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. 171-1654
FabrikantnummerRV-3029-C3-TB-QA-OPT.B
FabrikantMicro Crystal
3,021 €
Each (On a Tape of 100)
Aantal stuks
Alarm, Battery Backup, Calendar, Clock D:W:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C 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. 813-5775
FabrikantnummerRV-3029-C3-TB-QA-Opt.B
FabrikantMicro Crystal
3,07 €
Each
Aantal stuks
Alarm, Battery Backup, Calendar, Clock D:W:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C 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. 189-8320
FabrikantnummerDS1302+
FabrikantMaxim Integrated
3,174 €
Each (In a Pack of 5)
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. 732-7321
FabrikantnummerDS1306E+
FabrikantMaxim Integrated
4,58 €
Each
Aantal stuks
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 96B Serial-SPI Surface Mount TSSOP 20 6.6 x 4.5 x 0.95mm 6.6mm 4.5mm 0.95mm 5.5 V +70 °C
RS-stocknr. 667-6230
FabrikantnummerQ41454351000111
FabrikantEPSON
1,40 €
Each
Aantal stuks
Calendar, Timer - - - Serial Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS-stocknr. 188-9366
FabrikantnummerM41ST85WMX6TR
6,21 €
Each
Aantal stuks
Alarm, Battery Backup, Calendar, Watchdog Timer Binary, D:D:M:Y:C - 64bit - Surface Mount SOX 28 18.01 x 7.67 x 2.39mm 18.01mm 7.67mm 2.39mm 3.6 V +85 °C
RS-stocknr. 190-5159
FabrikantnummerDS1672U-33+
FabrikantMaxim Integrated
2,944 €
Each (In a Pack of 5)
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. 191-3290
FabrikantnummerDS3231M+
FabrikantMaxim Integrated
5,938 €
Each (In a Tube of 46)
Aantal stuks
Real Time Clock 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. 190-5152
FabrikantnummerDS1347T+T&R
FabrikantMaxim Integrated
2,894 €
Each (In a Pack of 5)
Aantal stuks
Alarm, Real Time Clock, SRAM DM:M:Y:C SS:MM:HH - - Surface Mount TDFN-EP 8 3.1 x 3.1 x 0.8mm 3.1mm 3.1mm 0.8mm 5.5 V +85 °C
RS-stocknr. 190-4742
FabrikantnummerDS1390U-33+T&R
FabrikantMaxim Integrated
1,465 €
Each (On a Reel of 3000)
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. 189-7233
FabrikantnummerDS1374U-33+
FabrikantMaxim Integrated
2,611 €
Each (In a Tube of 50)
Aantal stuks
Battery Backup, NV RAM Binary SS 3B Serial-I2C Surface Mount μSOP 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS-stocknr. 189-8595
FabrikantnummerDS1305+
FabrikantMaxim Integrated
5,32 €
Each (In a Pack of 2)
Aantal stuks
Alarm, 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. 823-0776
FabrikantnummerMCP79400-I/SN
FabrikantMicrochip
0,695 €
Each (In a Pack of 10)
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 4.9mm 3.9mm 1.5mm 2.5 V +85 °C
RS-stocknr. 189-7239
FabrikantnummerDS1394U-33+
FabrikantMaxim Integrated
2,897 €
Each (In a Tube of 50)
Aantal stuks
Trickle Charger DD:M:Y SS:MM:HH - Serial-SPI Surface Mount μMAX 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS-stocknr. 165-9386
FabrikantnummerDS1340C-33#
FabrikantMaxim Integrated
2,495 €
Each (In a Tube of 46)
Aantal stuks
Trickle Charger DD:M:Y SS:MM:HH 7B Serial-I2C Surface Mount SOIC 16 18.1 x 7.6 x 2.35mm 18.1mm 7.6mm 2.35mm 5.5 V +85 °C
RS-stocknr. 190-5189
FabrikantnummerDS17287-5+
FabrikantMaxim Integrated
14,37 €
Each
Aantal stuks
NV SRAM, Real Time Clock D:DM:Y SS:MM:HH 114B Multiplexed Surface Mount EDIP 24 1.34 x 0.72 x 0.37mm 1.34mm 0.72mm 0.37mm 5.5 V +70 °C
RS-stocknr. 828-9977
FabrikantnummerM48T12-70PC1
15,35 €
Each
Aantal stuks
Timekeeper SRAM D:M:Y HH:MM:SS 16kbit - Through Hole PCDIP 24 34.8 x 18.34 x 8.89mm 34.8mm 18.34mm 8.89mm 5.5 V +70 °C
RS-stocknr. 829-0399
FabrikantnummerM41T11M6F
3,202 €
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. 786-0751
FabrikantnummerDS1338Z-3+
FabrikantMaxim Integrated
3,06 €
Each (In a Pack of 2)
Aantal stuks
Clock M:M:DW SS:MM:HH 56B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 904-7512
FabrikantnummerX1B000311000112
FabrikantEPSON
4,48 €
Each
Aantal stuks
Clock - SS:HH 32bit Serial-I2C Surface Mount - 10 3.2 x 2.5 x 1mm 3.2mm 2.5mm 1mm 5.5 V +85 °C