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 Prix 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
N° de stock RS 189-7195
Référence fabricantDS12887A+
7,936 €
Each (In a Tube of 14)
Unité
Real Time Clock D:D:M:Y:C SS:MM:HH 114B - Surface Mount PDIP 24 32.26 x 14.61 x 4.45mm 32.26mm 14.61mm 4.45mm 5.5 V +85 °C
N° de stock RS 169-8296
Référence fabricantISL1208IB8Z
MarqueIntersil
1,721 €
Each (In a Tube of 100)
Unité
Alarm, Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 2B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
N° de stock RS 921-5721
Référence fabricantISL12020MIRZ
5,82 €
Each (In a Pack of 2)
Unité
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
N° de stock RS 889-6026
Référence fabricantMCP7940NT-I/MNY
MarqueMicrochip
0,627 €
Each (On a Reel of 3300)
Unité
Calendar, Clock DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount TDFN 8 3 x 2 x 0.75mm 3mm 2mm 0.75mm 5.5 V +85 °C
N° de stock RS 103-9915
Référence fabricantDS3231S#
6,222 €
Each (In a Tube of 46)
Unité
Battery Backup, 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 +70 °C
N° de stock RS 190-4742
Référence fabricantDS1390U-33+T&R
1,465 €
Each (On a Reel of 3000)
Unité
Trickle Charger D:D:M:Y - - Serial-SPI Surface Mount μSOP 10 3.16 x 3.12 x 0.95mm 3.16mm 3.12mm 0.95mm 5.5 V +85 °C
N° de stock RS 190-5777
Référence fabricantDS1338Z-33+T&R
3,09 €
Each (In a Pack of 5)
Unité
NV RAM, Real Time Clock DM:M:DW:Y SS:MM:HH - Serial-I2C Surface Mount μSOP 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
Nouveau
N° de stock RS 216-7799
Référence fabricantMAX31343EKA+T
3,042 €
Each (In a Pack of 5)
Unité
Alarm YY:MM:DD HH:MM:SS 64B Serial-I2C - WLP 8 - - - - - -
N° de stock RS 189-7219
Référence fabricantDS1337S+
1,806 €
Each (In a Tube of 100)
Unité
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
N° de stock RS 100-0649
Référence fabricantISL1208IU8Z-T7A
MarqueIntersil
3,94 €
Each (On a Tape of 2)
Unité
Alarm, Calendar, Clock, SRAM DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
N° de stock RS 165-9387
Référence fabricantDS1338C-33#
4,264 €
Each (In a Tube of 46)
Unité
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
N° de stock RS 880-5342
Référence fabricantM41T62LC6F
3,772 €
Each (In a Pack of 5)
Unité
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
N° de stock RS 192-1230
Référence fabricantDS12C887A+
7,659 €
Each (In a Tube of 14)
Unité
Alarm, Calendar YY:MM:DD HH:MM:SS 128B Multiplexed Through Hole EDIP 24 38.1 x 18.29 x 10.67mm 38.1mm 18.29mm 10.67mm 5.5 V +85 °C
N° de stock RS 204-2516
Référence fabricantMAX31343EKA+
3,628 €
Each (In a Pack of 5)
Unité
Real Time Clock - HH:MM:SS 64B - - WLP 8 - - - - - -
N° de stock RS 190-5149
Référence fabricantDS1670E+
8,89 €
Each
Unité
Real Time Clock, SRAM DM:M:DW:Y SS:MM:HH - Multiplexed Surface Mount TSSOP 20 6.6 x 4.5 x 0.95mm 6.6mm 4.5mm 0.95mm 3.63 V +70 °C
N° de stock RS 190-4739
Référence fabricantDS1372U+
2,242 €
Each (In a Tube of 50)
Unité
Alarm, Binary Counter, Real Time Clock - - - Serial-I2C, Serial-SPI Surface Mount μSOP 8 3.1 x 0.65 x 0.95mm 3.1mm 0.65mm 0.95mm 5.5 V +85 °C
N° de stock RS 729-3221
Référence fabricantRV-3049-C2-TB-008
14,05 €
Each
Unité
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 8B Serial-SPI Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +125 °C
N° de stock RS 189-7227
Référence fabricantDS1339U-33+
3,008 €
Each (In a Tube of 50)
Unité
Battery Backup, 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
N° de stock RS 761-7627
Référence fabricantMCP7940M-I/SN
MarqueMicrochip
0,49 €
Each (In a Pack of 5)
Unité
Calendar, NV SRAM 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
N° de stock RS 667-6224
Référence fabricantQ42724231000711
MarqueEPSON
6,24 €
Each
Unité
Calendar DW:DM:M:Y HH:MM:SS - Parallel Surface Mount SOP 24 16.3 x 7.9 x 2.8mm 16.3mm 7.9mm 2.8mm 5.5 V +85 °C