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. 169-8141
FabrikantnummerQ41856471000111
FabrikantEPSON
2,642 €
Each (On a Reel of 250)
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. 192-1620
FabrikantnummerDS1511W+
FabrikantMaxim Integrated
16,92 €
Each
Aantal stuks
Alarm, Watchdog Timer YY:MM:DD HH:MM:SS 256B Parallel Through Hole EDIP 28 37.34 x 14.61 x 4.45mm 37.34mm 14.61mm 4.45mm 5.5 V +70 °C
RS-stocknr. 667-6287
FabrikantnummerQ418564C2000511
FabrikantEPSON
3,17 €
Each
Aantal stuks
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 12 - 3.6mm 2.4mm - 5.5 V +85 °C
RS-stocknr. 177-0656
FabrikantnummerMCP79400-I/MS
FabrikantMicrochip
0,727 €
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. 190-5777
FabrikantnummerDS1338Z-33+T&R
FabrikantMaxim Integrated
3,09 €
Each (In a Pack of 5)
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. 192-1232
FabrikantnummerDS1305N+
FabrikantMaxim Integrated
4,795 €
Each (In a Tube of 25)
Aantal stuks
Alarm, Trickle Charger YY:MM:DD 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 +85 °C
RS-stocknr. 168-8017
FabrikantnummerM48T12-70PC1
14,098 €
Each (In a Tube of 14)
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. 191-4210
FabrikantnummerDS3231MPMB1#
FabrikantMaxim Integrated
19,02 €
Each
Aantal stuks
Real Time Clock - - - Serial-I2C Surface Mount - 6 - - - - - +85 °C
RS-stocknr. 205-3460
FabrikantnummerX1B000371000212
FabrikantEpson
1,808 €
Each (On a Reel of 250)
Aantal stuks
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS-stocknr. 518-299
FabrikantnummerISL12026IBZ
FabrikantIntersil
3,14 €
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
Nieuw
RS-stocknr. 216-7798
FabrikantnummerMAX31343EKA+T
FabrikantMaxim Integrated
1,743 €
Each (On a Reel of 2500)
Aantal stuks
Alarm YY:MM:DD HH:MM:SS 64B Serial-I2C - WLP 8 - - - - - -
RS-stocknr. 189-7244
FabrikantnummerDS1687-5+
FabrikantMaxim Integrated
10,256 €
Each (In a Tube of 14)
Aantal stuks
Alarm, Battery Backup, Calendar Binary, DW:DM:M:Y Binary, HH:MM:SS 242B 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. 191-6881
FabrikantnummerDS1050Z-001+
FabrikantMaxim Integrated
2,344 €
Each (In a Pack of 5)
Aantal stuks
Clock DM:M:DM:Y SS:MM:HH - - Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 169-8145
FabrikantnummerQ418564C2000511
FabrikantEPSON
2,88 €
Each (On a Reel of 250)
Aantal stuks
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 12 - 3.6mm 2.4mm - 5.5 V +85 °C
RS-stocknr. 185-1011
FabrikantnummerBU9873FVT-GE2
FabrikantROHM
0,769 €
Each (In a Pack of 10)
Aantal stuks
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 4.4 x 3 x 1mm 4.4mm 3mm 1mm 5.5 V +85 °C
RS-stocknr. 171-1645
FabrikantnummerRV-8564-C3-TA-020
FabrikantMicro Crystal
2,485 €
Each (On a Tape of 100)
Aantal stuks
Alarm, Interrupt, Timer - - - Serial-I2C Surface Mount SON 10 - 3.7mm 3.7mm 2.5mm 5.5 V +85 °C
RS-stocknr. 190-1838
FabrikantnummerDS12C887+
FabrikantMaxim Integrated
9,40 €
Each
Aantal stuks
Alarm Binary, DW:DM:M:Y Binary, HH:MM:SS 113B Multiplexed Through Hole EDIP 24 34.04 x 18.29 x 9.4mm 34.04mm 18.29mm 9.4mm 5.5 V +70 °C
RS-stocknr. 729-3221
FabrikantnummerRV-3049-C2-TB-008
FabrikantMicro Crystal
14,05 €
Each
Aantal stuks
Battery Backup, Calendar, NV RAM 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 +125 °C
RS-stocknr. 169-8136
FabrikantnummerQ42724231000711
FabrikantEPSON
5,664 €
Each (In a Tube of 25)
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS - Parallel Surface Mount SOP 24 16.3 x 7.9 x 2.8mm 16.3mm 7.9mm 2.8mm 5.5 V +85 °C
RS-stocknr. 177-0905
FabrikantnummerMCP795W10-I/SL
FabrikantMicrochip
1,092 €
Each (In a Pack of 5)
Aantal stuks
- D:M:Y, DW HH:MM:SS - Serial-SPI Surface Mount SOIC 14 8.65 x 3.9 x 1.5mm 8.65mm 3.9mm 1.5mm 3.6 V +85 °C