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. 190-5205
FabrikantnummerDS1744-70IND+
FabrikantMaxim Integrated
26,51 €
Each
Aantal stuks
NV SRAM, Real Time Clock Y:M:D:D HH:MM:SS - - Through Hole EDIP 28 39.37 x 18.80 x 10.67mm 39.37mm 18.8mm 10.67mm 5 V +85 °C
RS-stocknr. 192-1230
FabrikantnummerDS12C887A+
FabrikantMaxim Integrated
7,31 €
Each (In a Tube of 14)
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. 190-4742
FabrikantnummerDS1390U-33+T&R
FabrikantMaxim Integrated
1,414 €
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. 189-7509
FabrikantnummerDS1302Z+
FabrikantMaxim Integrated
2,284 €
Each (In a Tube of 100)
Aantal stuks
Calendar, NV RAM, Trickle Charger DW:DM:M:Y HH:MM:SS 31B Serial Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 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. 817-3654
FabrikantnummerMCP79410T-I/MS
FabrikantMicrochip
0,726 €
Each (On a Reel of 2500)
Aantal stuks
Alarm, Battery Backup, Calendar, Clock DW:D:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
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. 191-4210
FabrikantnummerDS3231MPMB1#
FabrikantMaxim Integrated
18,47 €
Each
Aantal stuks
Real Time Clock - - - Serial-I2C Surface Mount - 6 - - - - - +85 °C
RS-stocknr. 205-3453
FabrikantnummerX1B000232000112
FabrikantEpson
2,375 €
Each (In a Pack of 2)
Aantal stuks
Real Time Clock - - 128bit - - SOP-14 14 - - - - - -
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. 191-5233
FabrikantnummerDS1050Z-001+
FabrikantMaxim Integrated
1,403 €
Each (In a Tube of 100)
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. 923-5794
FabrikantnummerDS1305EN+
FabrikantMaxim Integrated
4,21 €
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. 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
RS-stocknr. 189-8509
FabrikantnummerDS1338U-33+
FabrikantMaxim Integrated
3,056 €
Each (In a Pack of 5)
Aantal stuks
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 56B 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. 169-8137
FabrikantnummerQ41454351000111
FabrikantEPSON
1,273 €
Each (On a Reel of 250)
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. 797-9590
FabrikantnummerDS1746WP-120+
FabrikantMaxim Integrated
25,86 €
Each
Aantal stuks
Calendar YY:MM:DD HH:MM:SS 128 x 8bit Parallel Surface Mount Power Cap 34 25.27 x 23.62 x 0.81mm 25.27mm 23.62mm 0.81mm 0.6 V, 3.6 V +70 °C
RS-stocknr. 189-8326
FabrikantnummerDS1339U-33+
FabrikantMaxim Integrated
3,40 €
Each (In a Pack of 2)
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. 729-3237
FabrikantnummerRV-4162-C7-TA-020
FabrikantMicro Crystal
4,53 €
Each
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SMD 8 3.2 x 1.5 x 0.8mm 3.2mm 1.5mm 0.8mm 4.4 V +85 °C
RS-stocknr. 169-8918
FabrikantnummerBU9873F-GTE2
FabrikantROHM
0,342 €
Each (On a Reel of 2500)
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
RS-stocknr. 190-4740
FabrikantnummerDS1374U-18+
FabrikantMaxim Integrated
2,469 €
Each (In a Tube of 50)
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 1.89 V +85 °C