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. 165-2097
FabrikantnummerMCP79511-I/MS
FabrikantMicrochip
€ 0,924
Each (In a Tube of 100)
Aantal stuks
Calendar D:W:M:Y, LY HH, HS, MM, SS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS-stocknr. 145-9302
FabrikantnummerM41T0M6F
€ 0,914
Each (On a Reel of 2500)
Aantal stuks
Real Time Clock DW:DM:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 168-6813
FabrikantnummerM41T00SM6F
€ 1,258
Each (On a Reel of 2500)
Aantal stuks
- DW:DM:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.25mm 5mm 4mm 1.25mm 5.5 V +85 °C
RS-stocknr. 191-3700
FabrikantnummerDS1374U-33+T&R
FabrikantMaxim Integrated
€ 3,09
Each (In a Pack of 5)
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. 732-7343
FabrikantnummerDS1337C#
FabrikantMaxim Integrated
€ 4,72
Each
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS - 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. 189-9440
FabrikantnummerDS1307Z+
FabrikantMaxim Integrated
€ 3,566
Each (In a Pack of 5)
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. 171-1656
FabrikantnummerRV-3049-C3-TB-QA-OPT.A
FabrikantMicro Crystal
€ 5,946
Each (On a Tape of 100)
Aantal stuks
Alarm, Battery Backup, Calendar, Clock D:W:M:Y HH:MM:SS 8B Serial-4 Wire, Serial-SPI Surface Mount SON 10 3.7 x 2.5 x 0.9mm 3.7mm 2.5mm 0.9mm 5.5 V +85 °C
RS-stocknr. 923-5781
FabrikantnummerDS1306E+
FabrikantMaxim Integrated
€ 3,818
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 +70 °C
RS-stocknr. 190-5152
FabrikantnummerDS1347T+T&R
FabrikantMaxim Integrated
€ 2,894
Each (In a Pack of 5)
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. 189-7214
FabrikantnummerDS1307Z+T&R
FabrikantMaxim Integrated
€ 1,454
Each (On a Reel of 2500)
Aantal stuks
Battery Backup, Calendar, NV RAM YY:MM:DD 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. 540-2704
FabrikantnummerDS1302+
FabrikantMaxim Integrated
€ 3,21
Each
Aantal stuks
Alarm, Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 31B Serial Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +70 °C
RS-stocknr. 803-2187
FabrikantnummerMCP79521-I/MS
FabrikantMicrochip
€ 0,924
Each (In a Pack of 5)
Aantal stuks
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 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. 667-6278
FabrikantnummerQ41802551000111
FabrikantEPSON
€ 1,56
Each
Aantal stuks
Alarm, Calendar, Timer - - - Serial-I2C Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS-stocknr. 192-1236
FabrikantnummerDS1511W+
FabrikantMaxim Integrated
€ 14,142
Each (In a Tube of 12)
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. 825-1076
FabrikantnummerMCP79510-I/MS
FabrikantMicrochip
€ 0,948
Each (In a Pack of 5)
Aantal stuks
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS-stocknr. 196-9062
FabrikantnummerISL12020MIRZ
€ 5,065
Each (In a Tube of 53)
Aantal stuks
- DW:DM:M:Y HH:MM:SS 128B - - DFN 20 - - - - - -
RS-stocknr. 205-3461
FabrikantnummerX1B000371000212
FabrikantEpson
€ 2,485
Each (In a Pack of 2)
Aantal stuks
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS-stocknr. 191-3286
FabrikantnummerDS1339AU+
FabrikantMaxim Integrated
€ 2,93
Each (In a Tube of 50)
Aantal stuks
Real Time Clock D:D:M:Y SS:MM:HH - Serial-I2C 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. 189-7217
FabrikantnummerDS1337+
FabrikantMaxim Integrated
€ 2,132
Each (In a Tube of 50)
Aantal stuks
Clock DD:M:Y SS:MM:HH 7B Serial-I2C Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +85 °C