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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Viewing 1 - 20 of 54 products
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Description Price 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 Stock No. 920-9001
Mfr. Part No.M48T35Y-70PC1
MYR101.273
Each (In a Tube of 12)
units
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 Stock No. 624-8466
Mfr. Part No.M48T35Y-70PC1
MYR109.81
Each
units
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 Stock No. 920-9007
Mfr. Part No.M41T62Q6F
MYR5.061
Each (On a Reel of 3000)
units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS:hh 16B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
RS Stock No. 624-8438
Mfr. Part No.M41T62Q6F
MYR8.758
Each (In a Pack of 5)
units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS:hh 16B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
RS Stock No. 714-7285
Mfr. Part No.M41T11MH6F
MYR23.63
Each
units
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 Stock No. 829-0444
Mfr. Part No.M41ST87WSS6F
MYR25.32
Each
units
Calendar D:D:M:Y:C HH:MM:SS:HSS 128B Serial Surface Mount SSOP 20 7.5 x 5.6 x 1.85mm 7.5mm 5.6mm 1.85mm 3.6 V +85 °C
RS Stock No. 578-831
Mfr. Part No.M41T65Q6F
MYR7.81
Each (In a Pack of 5)
units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS:hh 16B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
RS Stock No. 165-5488
Mfr. Part No.M41T93RMY6F
MYR11.741
Each (On a Reel of 1000)
units
Real Time Clock DW:DM:M:Y HH:MM:SS:hh 32B Serial-4 Wire, Serial-I2C Surface Mount SOX 18 11.66 x 7.67 x 2.39mm 11.66mm 7.67mm 2.39mm 5.5 V +85 °C
RS Stock No. 165-8028
Mfr. Part No.M41ST87WMX6TR
MYR23.435
Each (On a Reel of 1000)
units
Calendar, Clock DD:MM:YY HH:MM:SS 128B Serial-I2C Surface Mount SOX 28 18.01 x 7.67 x 2.38mm 18.01mm 7.67mm 2.38mm 3.6 V +85 °C
RS Stock No. 168-6813
Mfr. Part No.M41T00SM6F
MYR8.211
Each (On a Reel of 2500)
units
- 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 Stock No. 165-5507
Mfr. Part No.M41T62LC6F
MYR12.939
Each (On a Reel of 1000)
units
Alarm, Calendar, Real Time Clock, Square Wave Output, Watchdog Timer Binary, D:D:M:Y:C Binary, HH:MM:SS 16B Serial Surface Mount CLCC 8 3.3 x 1.6 x 0.8mm 3.3mm 1.6mm 0.8mm 4.4 V +85 °C
RS Stock No. 168-8043
Mfr. Part No.M41ST87WSS6F
MYR21.247
Each (On a Reel of 1350)
units
Calendar D:D:M:Y:C HH:MM:SS:HSS 128B Serial Surface Mount SSOP 20 7.5 x 5.6 x 1.85mm 7.5mm 5.6mm 1.85mm 3.6 V +85 °C
RS Stock No. 880-5342
Mfr. Part No.M41T62LC6F
MYR17.43
Each (In a Pack of 5)
units
Alarm, Calendar, Real Time Clock, Square Wave Output, Watchdog Timer Binary, D:D:M:Y:C Binary, HH:MM:SS 16B Serial Surface Mount CLCC 8 3.3 x 1.6 x 0.8mm 3.3mm 1.6mm 0.8mm 4.4 V +85 °C
RS Stock No. 165-5309
Mfr. Part No.M41T94MQ6F
MYR12.128
Each (On a Reel of 2500)
units
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 SOIC 16 10 x 4 x 1.6mm 10mm 4mm 1.6mm 5.5 V +85 °C
RS Stock No. 877-2772
Mfr. Part No.M41T0M6F
MYR8.894
Each (In a Pack of 5)
units
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 Stock No. 920-9004
Mfr. Part No.M48T58-70PC1
MYR75.631
Each (In a Tube of 12)
units
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 Stock No. 188-9342
Mfr. Part No.M41T80M6F
MYR9.19
Each
units
Alarm, Calendar Binary, D:D:M:Y:C - - 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 Stock No. 686-5036
Mfr. Part No.M48T58-70PC1
MYR77.11
Each
units
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 Stock No. 920-9120
Mfr. Part No.M41T00M6F
MYR7.33
Each (On a Reel of 2500)
units
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 Stock No. 714-7298
Mfr. Part No.M48T18-100PC1
MYR88.80
Each
units
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