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. 196-9066
FabrikantnummerISL12057IUZ
1,753 €
Each (In a Tube of 50)
Aantal stuks
- DW:DM:M:Y HH:MM:SS - - - MSOP 8 - - - - - -
RS-stocknr. 196-9062
FabrikantnummerISL12020MIRZ
4,605 €
Each (In a Tube of 53)
Aantal stuks
- DW:DM:M:Y HH:MM:SS 128B - - DFN 20 - - - - - -
Nieuw
RS-stocknr. 216-7799
FabrikantnummerMAX31343EKA+T
FabrikantMaxim Integrated
2,83 €
Each (In a Pack of 5)
Aantal stuks
Alarm YY:MM:DD HH:MM:SS 64B Serial-I2C - WLP 8 - - - - - -
RS-stocknr. 165-3406
FabrikantnummerMCP7940MT-I/MNY
FabrikantMicrochip
0,506 €
Each (On a Reel of 3300)
Aantal stuks
Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount TDFN 8 2 x 3 x 0.75mm 2mm 3mm 0.75mm 5.5 V +85 °C
RS-stocknr. 190-4745
FabrikantnummerDS1682S+T&R
FabrikantMaxim Integrated
2,154 €
Each (On a Reel of 2500)
Aantal stuks
Alarm - - - - Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 797-9458
FabrikantnummerDS1338Z-18+
FabrikantMaxim Integrated
2,50 €
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. 189-7194
FabrikantnummerDS12887+
FabrikantMaxim Integrated
7,636 €
Each (In a Tube of 14)
Aantal stuks
Alarm, Battery Backup, Calendar, Power Fail Binary, DW:DM:M:Y Binary, HH:MM:SS 114B Multiplexed Through Hole EDIP 24 34.04 x 18.8 x 9.4mm 34.04mm 18.8mm 9.4mm 5.5 V +70 °C
RS-stocknr. 191-3234
FabrikantnummerDS1337U+T&R
FabrikantMaxim Integrated
1,099 €
Each (On a Reel of 3000)
Aantal stuks
Real Time Clock D:D:M:Y SS:MM:HH - 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. 169-8345
FabrikantnummerISL12022IBZ
FabrikantIntersil
3,319 €
Each (In a Tube of 98)
Aantal stuks
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 128B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 690-2851
FabrikantnummerRV-2123-C2-STD-020
FabrikantMicro Crystal
6,79 €
Each
Aantal stuks
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-SPI Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
RS-stocknr. 169-8223
FabrikantnummerX1B000301000212
FabrikantEPSON
2,156 €
Each (On a Reel of 250)
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. 189-7248
FabrikantnummerDS2417P+
FabrikantMaxim Integrated
1,49 €
Each (In a Tube of 120)
Aantal stuks
Battery Backup, Calendar, ROM Binary Binary - Serial Surface Mount TSOC 6 4 x 3.89 x 1.5mm 4mm 3.89mm 1.5mm 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. 192-1227
FabrikantnummerDS1248Y-70+
FabrikantMaxim Integrated
26,694 €
Each (In a Tube of 10)
Aantal stuks
SRAM with Phantom Clock YY:MM:DD HH:MM:SS:hh 128 x 8bit Serial Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 44.2mm 18.8mm 10.92mm 5 V +70 °C
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. 100-0649
FabrikantnummerISL1208IU8Z-T7A
FabrikantIntersil
3,67 €
Each (On a Tape of 2)
Aantal stuks
Alarm, Calendar, Clock, SRAM DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS-stocknr. 196-9069
FabrikantnummerISL1208IB8Z-TK
1,049 €
Each (On a Reel of 1000)
Aantal stuks
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
RS-stocknr. 189-7195
FabrikantnummerDS12887A+
FabrikantMaxim Integrated
7,571 €
Each (In a Tube of 14)
Aantal stuks
Real Time Clock D:D:M:Y:C SS:MM:HH 114B - Surface Mount PDIP 24 32.26 x 14.61 x 4.45mm 32.26mm 14.61mm 4.45mm 5.5 V +85 °C
RS-stocknr. 889-5121
FabrikantnummerMCP79410-I/SN
FabrikantMicrochip
0,694 €
Each (In a Tube of 100)
Aantal stuks
Battery Backup, Calendar, Clock, NV Timekeeping SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 5.5 V +85 °C
RS-stocknr. 169-9339
FabrikantnummerBU9873F-GTE2
FabrikantROHM
0,699 €
Each (In a Pack of 10)
Aantal stuks
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount SOP 8 5.35 x 4.4 x 1.5mm 5.35mm 4.4mm 1.5mm 5.5 V +85 °C