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
€ 5,395
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. 189-7211
FabrikantnummerDS1306EN+
FabrikantMaxim Integrated
€ 4,151
Each (In a Tube of 74)
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 +85 °C
RS-stocknr. 122-3408
FabrikantnummerDS1340U-33+
FabrikantMaxim Integrated
€ 2,868
Each (In a Tube of 25)
Aantal stuks
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount μSOP 8 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS-stocknr. 190-5162
FabrikantnummerDS1372U+
FabrikantMaxim Integrated
€ 2,894
Each (In a Pack of 5)
Aantal stuks
Alarm, Binary Counter, Real Time Clock - - - Serial-I2C, Serial-SPI 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. 189-8643
FabrikantnummerDS1390U-3+
FabrikantMaxim Integrated
€ 3,87
Each (In a Pack of 2)
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 3.3 V +85 °C
RS-stocknr. 146-0213
FabrikantnummerMCP79412-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. 667-6252
FabrikantnummerQ41856471000111
FabrikantEPSON
€ 3,22
Each
Aantal stuks
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 20 - 7mm 5.4mm - 5.5 V +85 °C
RS-stocknr. 190-4733
FabrikantnummerDS1339BU+
FabrikantMaxim Integrated
€ 2,964
Each (In a Tube of 50)
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. 188-9342
FabrikantnummerM41T80M6F
€ 2,26
Each
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. 192-1456
FabrikantnummerDS12C887A+
FabrikantMaxim Integrated
€ 9,32
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. 192-1665
FabrikantnummerDS1556-70+
FabrikantMaxim Integrated
€ 36,15
Each
Aantal stuks
Alarm, NV SRAM, Watchdog Timer, Y2K YY:MM:DD HH:MM:SS - 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. 920-9124
FabrikantnummerM41T11M6F
€ 1,607
Each (On a Reel of 2500)
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. 171-0508
FabrikantnummerAB0805-T3
FabrikantAbracon
€ 1,352
Each (In a Pack of 5)
Aantal stuks
- - - - - Surface Mount 16-VFQFN - - - - - - 85 °C
RS-stocknr. 920-9007
FabrikantnummerM41T62Q6F
€ 0,902
Each (On a Reel of 3000)
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. 189-7204
FabrikantnummerDS1302ZN+T&R
FabrikantMaxim Integrated
€ 1,576
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 +85 °C
RS-stocknr. 168-6880
FabrikantnummerM41T11MH6F
€ 2,904
Each (On a Reel of 936)
Aantal stuks
Calendar, Chip Deselect, Switch Over DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOH 28 18.49 x 8.89 x 2.69mm 18.49mm 8.89mm 2.69mm 5.5 V +85 °C
RS-stocknr. 714-7298
FabrikantnummerM48T18-100PC1
€ 18,88
Each
Aantal stuks
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 8192B Parallel Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 39.88mm 18.34mm 8.89mm 5.5 V +70 °C
RS-stocknr. 923-7778
FabrikantnummerDS1747-70+
FabrikantMaxim Integrated
€ 30,524
Each (In a Tube of 10)
Aantal stuks
Calendar YY:MM:DD HH:MM:SS 512 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. 189-7510
FabrikantnummerDS1307Z+
FabrikantMaxim Integrated
€ 2,375
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. 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