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. 124-2362
FabrikantnummerPCF8563T/5,518
FabrikantNXP
0,514 €
Each (On a Reel of 2500)
Aantal stuks
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-stocknr. 714-7288
FabrikantnummerM41T56M6F
2,575 €
Each (In a Pack of 2)
Aantal stuks
Calendar, Chip Deselect, Switch Over 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. 865-2208
FabrikantnummerPCF8563T/5,518
FabrikantNXP
0,805 €
Each (In a Pack of 10)
Aantal stuks
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-stocknr. 103-1580
FabrikantnummerM41T56M6F
1,395 €
Each (On a Reel of 2500)
Aantal stuks
Calendar, Chip Deselect, Switch Over 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. 165-5486
FabrikantnummerM41T83SQA6F
1,749 €
Each (On a Reel of 1000)
Aantal stuks
Real Time Clock DW:DM:M:Y HH:MM:SS:hh 32B Serial-2 Wire, Serial-I2C Surface Mount QFN 16 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5.5 V +85 °C
RS-stocknr. 877-2781
FabrikantnummerM41T83SQA6F
3,10 €
Each (In a Pack of 5)
Aantal stuks
Real Time Clock DW:DM:M:Y HH:MM:SS:hh 32B Serial-2 Wire, Serial-I2C Surface Mount QFN 16 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5.5 V +85 °C
RS-stocknr. 162-6913
FabrikantnummerBQ4802LYPW
3,135 €
Each (In a Tube of 50)
Aantal stuks
Alarm, Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 16B Parallel Surface Mount TSSOP 28 9.7 x 4.4 x 1.15mm 9.7mm 4.4mm 1.15mm 3.6 V +70 °C
RS-stocknr. 729-3215
FabrikantnummerRV-3029-C2-TA-006
FabrikantMicro Crystal
12,36 €
Each
Aantal stuks
Battery Backup, Calendar, 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
RS-stocknr. 624-8466
FabrikantnummerM48T35Y-70PC1
23,19 €
Each
Aantal stuks
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-stocknr. 880-5345
FabrikantnummerM41T94MH6F
5,957 €
Each (In a Pack of 6)
Aantal stuks
Alarm, Battery Backup, Interrupt, NVRAM, Real Time Clock, Watchdog Timer Binary, D:D:M:Y:C Binary, HH:MM:SS 44B Serial-SPI 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. 511-103
FabrikantnummerPCF8563TS/4,118
FabrikantNXP
1,60 €
Each (In a Pack of 5)
Aantal stuks
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS-stocknr. 166-1602
FabrikantnummerPCF8563TS/4,118
FabrikantNXP
1,015 €
Each (On a Reel of 2500)
Aantal stuks
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS-stocknr. 920-9001
FabrikantnummerM48T35Y-70PC1
21,379 €
Each (In a Tube of 12)
Aantal stuks
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-stocknr. 662-4722
FabrikantnummerBQ4802LYPW
3,11 €
Each
Aantal stuks
Alarm, Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 16B Parallel Surface Mount TSSOP 28 9.7 x 4.4 x 1.15mm 9.7mm 4.4mm 1.15mm 3.6 V +70 °C
RS-stocknr. 165-5508
FabrikantnummerM41T94MH6F
3,887 €
Each (On a Reel of 936)
Aantal stuks
Alarm, Battery Backup, Interrupt, NVRAM, Real Time Clock, Watchdog Timer Binary, D:D:M:Y:C Binary, HH:MM:SS 44B Serial-SPI 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. 171-1639
FabrikantnummerRV-3029-C2-TA-006
FabrikantMicro Crystal
7,82 €
Each (On a Tape of 100)
Aantal stuks
Battery Backup, Calendar, 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
RS-stocknr. 188-9206
FabrikantnummerM41T82RM6F
1,361 €
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. 189-8496
FabrikantnummerDS1307N+
FabrikantMaxim Integrated
4,085 €
Each (In a Pack of 2)
Aantal stuks
Clock DM:M:DW:Y SS:MM:HH 56B 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
Nieuw
RS-stocknr. 219-4634
FabrikantnummerPCF2129T/2,518
FabrikantNXP
1,802 €
Each (On a Reel of 1000)
Aantal stuks
- D:W:M:Y SS:MM:HH 128bit Serial-SPI - SO16 16 - - - - - -
RS-stocknr. 829-0399
FabrikantnummerM41T11M6F
3,282 €
Each (In a Pack of 5)
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