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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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. 177-0905
Mfr. Part No.MCP795W10-I/SL
BrandMicrochip
HK$13.66
Each (In a Pack of 5)
units
- D:M:Y, DW HH:MM:SS - Serial-SPI Surface Mount SOIC 14 8.65 x 3.9 x 1.5mm 8.65mm 3.9mm 1.5mm 3.6 V +85 °C
RS Stock No. 732-7355
Mfr. Part No.DS1337U+
HK$26.24
Each
units
Calendar DW:DM:M:Y HH:MM:SS - 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 Stock No. 146-0213
Mfr. Part No.MCP79412-I/SN
BrandMicrochip
HK$7.581
Each (In a Tube of 100)
units
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 Stock No. 165-9387
Mfr. Part No.DS1338C-33#
HK$44.867
Each (In a Tube of 46)
units
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 Stock No. 797-9600
Mfr. Part No.DS1747-70+
HK$367.76
Each
units
Calendar YY:MM:DD HH:MM:SS 512 x 8bit Parallel Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 44.2mm 18.8mm 10.92mm 0.8 V, 5.3 V +70 °C
RS Stock No. 829-0355
Mfr. Part No.M41T81SM6F
HK$22.912
Each (In a Pack of 5)
units
Calendar D:D:M:Y:C HH:MM:SS:HSS 20B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS Stock No. 189-8359
Mfr. Part No.DS1672S-33+
HK$28.57
Each (In a Pack of 5)
units
Battery Backup, 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 Stock No. 190-4736
Mfr. Part No.DS1340Z-33+
HK$23.978
Each (In a Tube of 100)
units
Clock, 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 Stock No. 192-1236
Mfr. Part No.DS1511W+
HK$152.213
Each (In a Tube of 12)
units
Alarm, Watchdog Timer YY:MM:DD HH:MM:SS 256B Parallel Through Hole EDIP 28 37.34 x 14.61 x 4.45mm 37.34mm 14.61mm 4.45mm 5.5 V +70 °C
RS Stock No. 190-5152
Mfr. Part No.DS1347T+T&R
HK$27.584
Each (In a Pack of 5)
units
Alarm, Real Time Clock, SRAM DM:M:Y:C SS:MM:HH - - Surface Mount TDFN-EP 8 3.1 x 3.1 x 0.8mm 3.1mm 3.1mm 0.8mm 5.5 V +85 °C
RS Stock No. 165-2099
Mfr. Part No.MCP79510-I/MS
BrandMicrochip
HK$9.938
Each (In a Tube of 100)
units
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS Stock No. 190-4753
Mfr. Part No.DS3234S#T&R
HK$43.645
Each (On a Reel of 1000)
units
SRAM D:D:M:Y SS:MM:HH 256B - Surface Mount SO 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +70 °C
RS Stock No. 761-3903
Mfr. Part No.DS1305EN+T&R
HK$47.77
Each
units
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 96B Serial-3 Wire Surface Mount TSSOP 20 6.6 x 4.5 x 0.95mm 6.6mm 4.5mm 0.95mm 5.5 V +85 °C
RS Stock No. 191-4210
Mfr. Part No.DS3231MPMB1#
HK$189.93
Each
units
Real Time Clock - - - Serial-I2C Surface Mount - 6 - - - - - +85 °C
RS Stock No. 145-9302
Mfr. Part No.M41T0M6F
HK$8.955
Each (On a Reel of 2500)
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. 923-7778
Mfr. Part No.DS1747-70+
HK$323.379
Each (In a Tube of 10)
units
Calendar YY:MM:DD HH:MM:SS 512 x 8bit Parallel Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 44.2mm 18.8mm 10.92mm 0.8 V, 5.3 V +70 °C
RS Stock No. 923-5794
Mfr. Part No.DS1305EN+
HK$45.644
Each (In a Tube of 74)
units
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 96B Serial-SPI Surface Mount TSSOP 20 6.6 x 4.5 x 0.95mm 6.6mm 4.5mm 0.95mm 5.5 V +85 °C
RS Stock No. 714-7285
Mfr. Part No.M41T11MH6F
HK$45.01
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. 189-7194
Mfr. Part No.DS12887+
HK$82.751
Each (In a Tube of 14)
units
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 Stock No. 920-9120
Mfr. Part No.M41T00M6F
HK$13.298
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