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, a 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 facilitate the performance of the software functions that are time dependant. They are designed to run on an ultra-low power consumption, often run on a lithium battery source or 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. 761-7627
FabrikantnummerMCP7940M-I/SN
FabrikantMicrochip
€ 0,518
Each (In a Pack of 5)
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. 912-6943
FabrikantnummerMCP7940M-I/SN
FabrikantMicrochip
€ 0,45
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. 111-3741
FabrikantnummerMCP7940MT-I/SN
FabrikantMicrochip
€ 0,463
Each (On a Reel of 3300)
Aantal stuks
Calendar, Clock DM:M:DW:Y HH:MM:SS - Serial-2 Wire, 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. 165-2125
FabrikantnummerMCP7940N-I/P
FabrikantMicrochip
€ 0,644
Each (In a Tube of 60)
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 10.16mm 7.11mm 4.95mm 5.5 V +85 °C
RS-stocknr. 803-2222
FabrikantnummerMCP79520-I/MS
FabrikantMicrochip
€ 1,06
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. 823-7954
FabrikantnummerMCP79511-I/MS
FabrikantMicrochip
€ 1,06
Each (In a Pack of 5)
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. 798-5254
FabrikantnummerMCP7940N-I/MS
FabrikantMicrochip
€ 0,638
Each (In a Pack of 10)
Aantal stuks
Battery Backup, Calendar 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. 165-2097
FabrikantnummerMCP79511-I/MS
FabrikantMicrochip
€ 0,915
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. 165-1998
FabrikantnummerMCP7940N-I/MS
FabrikantMicrochip
€ 0,60
Each (In a Tube of 100)
Aantal stuks
Battery Backup, Calendar 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. 810-3933
FabrikantnummerMCP7940N-I/P
FabrikantMicrochip
€ 0,684
Each (In a Pack of 10)
Aantal stuks
Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 10.16mm 7.11mm 4.95mm 5.5 V +85 °C
RS-stocknr. 774-7403
FabrikantnummerMCP7940M-I/P
FabrikantMicrochip
€ 0,553
Each (In a Bag of 10)
Aantal stuks
Alarm, Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 10.16mm 7.11mm 4.95mm 5.5 V +85 °C
RS-stocknr. 817-3654
FabrikantnummerMCP79410T-I/MS
FabrikantMicrochip
€ 0,722
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. 723-4749
FabrikantnummerMCP79410-I/MS
FabrikantMicrochip
€ 0,83
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. 146-0203
FabrikantnummerMCP7940M-I/P
FabrikantMicrochip
€ 0,509
Each (In a Tube of 60)
Aantal stuks
Alarm, Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 10.16mm 7.11mm 4.95mm 5.5 V +85 °C
RS-stocknr. 159-7452
FabrikantnummerMCP79520-I/MS
FabrikantMicrochip
€ 0,915
Each (In a Tube of 100)
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. 817-3658
FabrikantnummerMCP79410T-I/SN
FabrikantMicrochip
€ 0,689
Each (On a Reel of 3300)
Aantal stuks
Alarm, Battery Backup, Calendar, Clock DW:D: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 5.5 V +85 °C
RS-stocknr. 145-9048
FabrikantnummerMCP7940N-I/ST
FabrikantMicrochip
€ 0,60
Each (In a Tube of 100)
Aantal stuks
Calendar DW:D:M:Y HH:MM:SS 64B Serial-I2C Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 4.5mm 3.1mm 1.05mm 5.5 V +85 °C
RS-stocknr. 165-2031
FabrikantnummerMCP79522-I/MS
FabrikantMicrochip
€ 1,006
Each (In a Tube of 100)
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. 823-3712
FabrikantnummerMCP7940N-I/ST
FabrikantMicrochip
€ 0,638
Each (In a Pack of 10)
Aantal stuks
Calendar DW:D:M:Y HH:MM:SS 64B Serial-I2C Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 4.5mm 3.1mm 1.05mm 5.5 V +85 °C
RS-stocknr. 889-5121
FabrikantnummerMCP79410-I/SN
FabrikantMicrochip
€ 0,689
Each (In a Tube of 100)
Aantal stuks
Battery Backup, Calendar, Clock, NV Timekeeping 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