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 401 - 418 of 418 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. 729-3224
Mfr. Part No.RV-3029-C2-TB-030
HK$66.86
Each
units
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
RS Stock No. 732-7535
Mfr. Part No.DS2417P+
HK$22.64
Each
units
Battery Backup, Calendar, ROM Binary Binary - Serial Surface Mount TSOC 6 4 x 3.89 x 1.5mm 4mm 3.89mm 1.5mm 5.5 V +85 °C
RS Stock No. 205-3461
Mfr. Part No.X1B000371000212
BrandEpson
HK$25.58
Each (In a Pack of 2)
units
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS Stock No. 190-7170
Mfr. Part No.DS1904L-F5#
HK$91.58
Each
units
- - - - - - - - - - - - - -
RS Stock No. 667-6252
Mfr. Part No.Q41856471000111
BrandEPSON
HK$34.42
Each
units
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 20 - 7mm 5.4mm - 5.5 V +85 °C
RS Stock No. 189-7232
Mfr. Part No.DS1374C-33#
HK$45.042
Each (In a Tube of 46)
units
Battery Backup, Calendar, NV RAM Binary SS 3B Serial-I2C Surface Mount SOIC 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +85 °C
RS Stock No. 190-5219
Mfr. Part No.DS3231S#T&R
HK$67.95
Each
units
Real Time Clock DM:M:DW:Y SS:MM:HH - Serial-I2C Surface Mount SO 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +70 °C
RS Stock No. 190-4733
Mfr. Part No.DS1339BU+
HK$29.262
Each (In a Tube of 50)
units
Real Time Clock D:D: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. 205-3460
Mfr. Part No.X1B000371000212
BrandEpson
HK$18.605
Each (On a Reel of 250)
units
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS Stock No. 732-7343
Mfr. Part No.DS1337C#
HK$50.15
Each
units
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SOIC 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +85 °C
RS Stock No. 192-1541
Mfr. Part No.DS1338Z-18+
HK$32.15
Each (In a Pack of 2)
units
Calendar YY:MM:DD HH:MM:SS 56B 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. 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. 165-5309
Mfr. Part No.M41T94MQ6F
HK$21.557
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. 817-3667
Mfr. Part No.MCP79410T-I/ST
BrandMicrochip
HK$7.231
Each (On a Reel of 2500)
units
Alarm, Battery Backup, Calendar, Clock DW:D:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 3.1mm 4.5mm 1.05mm 5.5 V +85 °C
RS Stock No. 192-1227
Mfr. Part No.DS1248Y-70+
HK$280.109
Each (In a Tube of 10)
units
SRAM with Phantom Clock YY:MM:DD HH:MM:SS:hh 128 x 8bit Serial Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 44.2mm 18.8mm 10.92mm 5 V +70 °C
RS Stock No. 729-3237
Mfr. Part No.RV-4162-C7-TA-020
HK$46.94
Each
units
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SMD 8 3.2 x 1.5 x 0.8mm 3.2mm 1.5mm 0.8mm 4.4 V +85 °C
RS Stock No. 190-4752
Mfr. Part No.DS3232SN#T&R
HK$47.167
Each (On a Reel of 1000)
units
Alarm, SRAM DM:M:DW:Y SS:MM:HH 236B Serial-I2C Surface Mount SO 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +85 °C
RS Stock No. 169-8315
Mfr. Part No.DS1302Z+
HK$24.329
Each (In a Tube of 100)
units
Calendar, NV RAM, Trickle Charger DW:DM:M:Y HH:MM:SS 31B Serial Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +70 °C