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. 189-7246
FabrikantnummerDS1747-70+
FabrikantMaxim Integrated
36,916 €
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. 761-3903
FabrikantnummerDS1305EN+T&R
FabrikantMaxim Integrated
2,30 €
Each
Aantal stuks
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 96B Serial-3 Wire 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. 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. 190-4738
FabrikantnummerDS1347T+T&R
FabrikantMaxim Integrated
1,583 €
Each (On a Reel of 2500)
Aantal stuks
Alarm, Real Time Clock, SRAM DM:M:Y:C SS:MM:HH - - Surface Mount TDFN-EP 8 3.1 x 3.1 x 0.8mm 3.1mm 3.1mm 0.8mm 5.5 V +85 °C
RS-stocknr. 192-1246
FabrikantnummerDS1744W-120+
FabrikantMaxim Integrated
25,019 €
Each (In a Tube of 12)
Aantal stuks
Calendar YY:MM:DD HH:MM:SS 32 x 8B Parallel Through Hole EDIP 28 39.37 x 18.8 x 10.67mm 39.37mm 18.8mm 10.67mm 0.6 V, 3.6 V +70 °C
RS-stocknr. 190-5176
FabrikantnummerDS3234S#T&R
FabrikantMaxim Integrated
7,41 €
Each
Aantal stuks
SRAM D:D:M:Y SS:MM:HH 256B - Surface Mount SO 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +70 °C
RS-stocknr. 797-9470
FabrikantnummerDS1391U-3+
FabrikantMaxim Integrated
3,115 €
Each (In a Pack of 2)
Aantal stuks
Calendar YY:MM:DD HH:MM:SS - Serial-SPI Surface Mount μMAX 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.3 V +85 °C
RS-stocknr. 190-5169
FabrikantnummerDS1682S+T&R
FabrikantMaxim Integrated
4,91 €
Each
Aantal stuks
Alarm - - - - Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 786-0755
FabrikantnummerDS1340C-33#
FabrikantMaxim Integrated
2,54 €
Each
Aantal stuks
Trickle Charger DD:M:Y SS:MM:HH 7B Serial-I2C Surface Mount SOIC 16 18.1 x 7.6 x 2.35mm 18.1mm 7.6mm 2.35mm 5.5 V +85 °C
RS-stocknr. 205-3456
FabrikantnummerX1B000311000112
FabrikantEpson
0,927 €
Each (On a Reel of 250)
Aantal stuks
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS-stocknr. 188-9207
FabrikantnummerM41T82SM6F
1,177 €
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. 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. 189-7254
FabrikantnummerDS3234S#
FabrikantMaxim Integrated
7,34 €
Each (In a Tube of 36)
Aantal stuks
SRAM DD:M:Y SS:MM:HH 256B Serial-SPI Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 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. 189-8490
FabrikantnummerDS1374C-33#
FabrikantMaxim Integrated
5,77 €
Each (In a Pack of 2)
Aantal stuks
Battery Backup, Calendar, NV RAM Binary SS 3B Serial-I2C Surface Mount SOIC 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +85 °C
RS-stocknr. 189-8654
FabrikantnummerDS1340C-33#
FabrikantMaxim Integrated
5,87 €
Each (In a Pack of 2)
Aantal stuks
Trickle Charger DD:M:Y SS:MM:HH 7B Serial-I2C Surface Mount SOIC 16 18.1 x 7.6 x 2.35mm 18.1mm 7.6mm 2.35mm 5.5 V +85 °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. 729-3237
FabrikantnummerRV-4162-C7-TA-020
FabrikantMicro Crystal
4,85 €
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. 912-6943
FabrikantnummerMCP7940M-I/SN
FabrikantMicrochip
0,451 €
Each (In a Tube of 100)
Aantal stuks
Calendar, NV 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. 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