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. 912-2774
FabrikantnummerMCP7940N-I/SN
FabrikantMicrochip
0,572 €
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. 191-4238
FabrikantnummerDS12885S+
FabrikantMaxim Integrated
5,341 €
Each (In a Tube of 30)
Aantal stuks
Alarm, Calendar, Clock - HH:MM:SS 144B Multiplexed Surface Mount SOIC 24 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm 2.35mm 5.5 V +70 °C
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. 169-8324
FabrikantnummerCDP68HC68T1MZ
FabrikantIntersil
4,741 €
Each (In a Tube of 38)
Aantal stuks
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS 32B Serial-SPI Surface Mount SOIC W 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 6 V +85 °C
RS-stocknr. 205-3458
FabrikantnummerX1B000371000112
FabrikantEpson
2,656 €
Each (On a Reel of 250)
Aantal stuks
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS-stocknr. 723-4749
FabrikantnummerMCP79410-I/MS
FabrikantMicrochip
0,795 €
Each (In a Pack of 2)
Aantal stuks
Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
RS-stocknr. 189-7227
FabrikantnummerDS1339U-33+
FabrikantMaxim Integrated
2,785 €
Each (In a Tube of 50)
Aantal stuks
Battery Backup, Calendar DW:DM: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. 188-9207
FabrikantnummerM41T82SM6F
1,054 €
Each (On a Reel of 2500)
Aantal stuks
Alarm, Battery Backup, Calendar, Watchdog Timer Binary, D:D:M:Y:C - 32bit 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. 817-3658
FabrikantnummerMCP79410T-I/SN
FabrikantMicrochip
0,694 €
Each (On a Reel of 3300)
Aantal stuks
Alarm, Battery Backup, Calendar, Clock DW:D: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 5.5 V +85 °C
RS-stocknr. 824-6447
FabrikantnummerMCP7940NT-I/MNY
FabrikantMicrochip
0,695 €
Each (In a Pack of 10)
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
RS-stocknr. 190-4732
FabrikantnummerDS1338Z-33+T&R
FabrikantMaxim Integrated
1,414 €
Each (On a Reel of 2500)
Aantal stuks
NV RAM, Real Time Clock DM:M:DW:Y SS:MM:HH - Serial-I2C Surface Mount μSOP 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 189-7236
FabrikantnummerDS1390U-33+
FabrikantMaxim Integrated
2,263 €
Each (In a Tube of 50)
Aantal stuks
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS - Serial-SPI 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. 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. 797-9600
FabrikantnummerDS1747-70+
FabrikantMaxim Integrated
32,72 €
Each
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. 171-1636
FabrikantnummerRV-3049-C2-STD-025
FabrikantMicro Crystal
4,18 €
Each (On a Tape of 100)
Aantal stuks
Alarm, Calendar, Timer 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 +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. 797-9427
FabrikantnummerDS12R885S-33+
FabrikantMaxim Integrated
3,36 €
Each
Aantal stuks
Alarm, Leap Year, NV SRAM, Square Wave Output, Trickle Charger YY:MM:DD HH:MM:SS 114B Multiplexed Surface Mount SOIC 24 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm 2.35mm 5.5 V +85 °C
RS-stocknr. 170-8112
FabrikantnummerISL1208IU8Z-T7A
FabrikantIntersil
2,697 €
Each (On a Reel of 250)
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