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. 189-8391
FabrikantnummerDS3231MZ+
FabrikantMaxim Integrated
7,335 €
Each (In a Pack of 2)
Aantal stuks
Battery Backup, Calendar Binary HH:MM:SS - Serial-I2C 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. 192-1626
FabrikantnummerDS1248Y-70+
FabrikantMaxim Integrated
34,65 €
Each
Aantal stuks
SRAM with Phantom Clock YY:MM:DD HH:MM:SS:hh 128 x 8bit Serial Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 44.2mm 18.8mm 10.92mm 5 V +70 °C
RS-stocknr. 190-5143
FabrikantnummerDS1340Z-33+T&R
FabrikantMaxim Integrated
3,09 €
Each (In a Pack of 5)
Aantal stuks
Real Time Clock, Trickle Charger D:D:M:Y SS:MM:HH - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 177-0307
FabrikantnummerMCP79412-I/MS
FabrikantMicrochip
0,78 €
Each (In a Tube of 100)
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. 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. 205-3463
FabrikantnummerX1B000301000112
FabrikantEpson
5,65 €
Each
Aantal stuks
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS-stocknr. 761-9759
FabrikantnummerDS1307Z+T&R
FabrikantMaxim Integrated
3,09 €
Each
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. 786-0758
FabrikantnummerDS1338C-33#
FabrikantMaxim Integrated
4,96 €
Each
Aantal stuks
Clock M:M:DW SS:MM:HH 56B 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. 189-7221
FabrikantnummerDS1337U+
FabrikantMaxim Integrated
1,762 €
Each (In a Tube of 50)
Aantal stuks
Real Time Clock D:D:M:Y:C SS:MM:HH - 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. 189-8635
FabrikantnummerDS1337S+
FabrikantMaxim Integrated
2,458 €
Each (In a Pack of 5)
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 798-5267
FabrikantnummerMCP79411-I/SN
FabrikantMicrochip
0,829 €
Each (In a Pack of 10)
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. 189-8563
FabrikantnummerDS12887+
FabrikantMaxim Integrated
9,73 €
Each
Aantal stuks
Alarm, Battery Backup, Calendar, Power Fail Binary, DW:DM:M:Y Binary, HH:MM:SS 114B 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. 189-8362
FabrikantnummerDS3232S#
FabrikantMaxim Integrated
8,15 €
Each
Aantal stuks
Battery Backup, Calendar, NV RAM DD:M:Y HH:MM:SS - Serial-I2C Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +70 °C
RS-stocknr. 196-9065
FabrikantnummerISL12022IBZ
4,20 €
Each (In a Pack of 2)
Aantal stuks
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
RS-stocknr. 168-6880
FabrikantnummerM41T11MH6F
2,64 €
Each (On a Reel of 936)
Aantal stuks
Calendar, Chip Deselect, Switch Over DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOH 28 18.49 x 8.89 x 2.69mm 18.49mm 8.89mm 2.69mm 5.5 V +85 °C
RS-stocknr. 188-9366
FabrikantnummerM41ST85WMX6TR
6,21 €
Each
Aantal stuks
Alarm, Battery Backup, Calendar, Watchdog Timer Binary, D:D:M:Y:C - 64bit - Surface Mount SOX 28 18.01 x 7.67 x 2.39mm 18.01mm 7.67mm 2.39mm 3.6 V +85 °C
RS-stocknr. 191-3290
FabrikantnummerDS3231M+
FabrikantMaxim Integrated
5,938 €
Each (In a Tube of 46)
Aantal stuks
Real Time Clock D:D:M:Y SS:MM:HH - Serial-I2C Surface Mount SO 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +85 °C
RS-stocknr. 189-8589
FabrikantnummerDS1388Z-33+
FabrikantMaxim Integrated
5,20 €
Each (In a Pack of 2)
Aantal stuks
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 512B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 3.63 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