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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Beskrivning Pris 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-artikelnummer 919-6337
Tillv. art.nrM48T18-100PC1
VarumärkeSTMicroelectronics
158,40 kr
Each (In a Tube of 12)
Enheter
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 8192B Parallel Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 39.88mm 18.34mm 8.89mm 5.5 V +70 °C
RS-artikelnummer 714-7298
Tillv. art.nrM48T18-100PC1
VarumärkeSTMicroelectronics
177,66 kr
Each
Enheter
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 8192B Parallel Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 39.88mm 18.34mm 8.89mm 5.5 V +70 °C
RS-artikelnummer 920-9120
Tillv. art.nrM41T00M6F
VarumärkeSTMicroelectronics
12,616 kr
Each (On a Reel of 2500)
Enheter
Calendar D:M:Y:C HH:MM:SS 8B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-artikelnummer 829-0380
Tillv. art.nrM41T00M6F
VarumärkeSTMicroelectronics
23,638 kr
Each (In a Pack of 5)
Enheter
Calendar D:M:Y:C HH:MM:SS 8B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-artikelnummer 124-2362
Tillv. art.nrPCF8563T/5,518
VarumärkeNXP
6,804 kr
Each (On a Reel of 2500)
Enheter
Calendar, Clock YY:MM:DD:dd HH:MM:SS - Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.45mm 5mm 4mm 1.45mm 5.5 V +85 °C
RS-artikelnummer 798-5258
Tillv. art.nrMCP7940N-I/SN
VarumärkeMicrochip
6,676 kr
Each (In a Pack of 10)
Enheter
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-artikelnummer 774-7403
Tillv. art.nrMCP7940M-I/P
VarumärkeMicrochip
5,78 kr
Each (In a Bag of 10)
Enheter
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-artikelnummer 865-2208
Tillv. art.nrPCF8563T/5,518
VarumärkeNXP
7,062 kr
Each (In a Pack of 10)
Enheter
Calendar, Clock YY:MM:DD:dd HH:MM:SS - Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.45mm 5mm 4mm 1.45mm 5.5 V +85 °C
RS-artikelnummer 146-0203
Tillv. art.nrMCP7940M-I/P
VarumärkeMicrochip
5,327 kr
Each (In a Tube of 60)
Enheter
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-artikelnummer 912-2774
Tillv. art.nrMCP7940N-I/SN
VarumärkeMicrochip
6,097 kr
Each (In a Tube of 100)
Enheter
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-artikelnummer 817-3654
Tillv. art.nrMCP79410T-I/MS
VarumärkeMicrochip
7,741 kr
Each (On a Reel of 2500)
Enheter
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-artikelnummer 714-0855
Tillv. art.nrM41T00SM6F
VarumärkeSTMicroelectronics
24,42 kr
Each
Enheter
- 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-artikelnummer 920-9001
Tillv. art.nrM48T35Y-70PC1
VarumärkeSTMicroelectronics
212,863 kr
Each (In a Tube of 12)
Enheter
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 32768B Parallel Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 39.88mm 18.34mm 8.89mm 5.5 V +70 °C
RS-artikelnummer 828-9977
Tillv. art.nrM48T12-70PC1
VarumärkeSTMicroelectronics
133,73 kr
Each
Enheter
Timekeeper SRAM D:M:Y HH:MM:SS 16kbit - Through Hole PCDIP 24 34.8 x 18.34 x 8.89mm 34.8mm 18.34mm 8.89mm 5.5 V +70 °C
RS-artikelnummer 923-1499
Tillv. art.nrISL12020MIRZ
49,103 kr
Each (In a Tube of 53)
Enheter
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 128B Serial-I2C Surface Mount DFN 20 5.5 x 4 x 1.3mm 5.5mm 4mm 1.3mm 5.5 V +85 °C
RS-artikelnummer 723-4749
Tillv. art.nrMCP79410-I/MS
VarumärkeMicrochip
8,48 kr
Each (In a Pack of 2)
Enheter
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-artikelnummer 624-8466
Tillv. art.nrM48T35Y-70PC1
VarumärkeSTMicroelectronics
230,88 kr
Each
Enheter
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 32768B Parallel Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 39.88mm 18.34mm 8.89mm 5.5 V +70 °C
RS-artikelnummer 168-8017
Tillv. art.nrM48T12-70PC1
VarumärkeSTMicroelectronics
122,956 kr
Each (In a Tube of 14)
Enheter
Timekeeper SRAM D:M:Y HH:MM:SS 16kbit - Through Hole PCDIP 24 34.8 x 18.34 x 8.89mm 34.8mm 18.34mm 8.89mm 5.5 V +70 °C
RS-artikelnummer 921-5721
Tillv. art.nrISL12020MIRZ
56,945 kr
Each (In a Pack of 2)
Enheter
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 128B Serial-I2C Surface Mount DFN 20 5.5 x 4 x 1.3mm 5.5mm 4mm 1.3mm 5.5 V +85 °C
RS-artikelnummer 729-3224
Tillv. art.nrRV-3029-C2-TB-030
VarumärkeMicro Crystal
67,73 kr
Each
Enheter
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 8B Serial-I2C Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C