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 825-1164
Référence fabricantMCP79411-I/MS
MarqueMicrochip
0,864 €
Each (In a Pack of 10)
Unité
Calendar DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
N° de stock RS 797-9470
Référence fabricantDS1391U-3+
3,115 €
Each (In a Pack of 2)
Unité
Calendar YY:MM:DD HH:MM:SS - Serial-SPI Surface Mount μMAX 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.3 V +85 °C
N° de stock RS 196-9066
Référence fabricantISL12057IUZ
1,753 €
Each (In a Tube of 50)
Unité
- DW:DM:M:Y HH:MM:SS - - - MSOP 8 - - - - - -
N° de stock RS 190-4750
Référence fabricantDS3231SN#T&R
4,188 €
Each (On a Reel of 1000)
Unité
Real Time Clock DM:M:DW:Y SS:MM:HH 236B Serial-I2C Surface Mount SO 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +85 °C
N° de stock RS 168-6813
Référence fabricantM41T00SM6F
1,144 €
Each (On a Reel of 2500)
Unité
- 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
N° de stock RS 177-0307
Référence fabricantMCP79412-I/MS
MarqueMicrochip
0,78 €
Each (In a Tube of 100)
Unité
- D:M:Y, DW HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
N° de stock RS 145-9048
Référence fabricantMCP7940N-I/ST
MarqueMicrochip
0,605 €
Each (In a Tube of 100)
Unité
Calendar DW:D:M:Y HH:MM:SS 64B Serial-I2C Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 4.5mm 3.1mm 1.05mm 5.5 V +85 °C
N° de stock RS 727-5743
Référence fabricantPCA8565TS/1,118
MarqueNXP
1,38 €
Each (In a Pack of 2)
Unité
Alarm, Calendar, Interrupt, 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 +125 °C
N° de stock RS 797-9458
Référence fabricantDS1338Z-18+
2,50 €
Each (In a Pack of 2)
Unité
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
N° de stock RS 191-5234
Référence fabricantDS1685S-5+
4,362 €
Each (In a Tube of 30)
Unité
NV SRAM, Real Time Clock - - 242B Multiplexed Surface Mount SO 24 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm 2.35mm 5.5 V +70 °C
N° de stock RS 732-7318
Référence fabricantDS1302S+
3,17 €
Each
Unité
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 31B Serial Surface Mount SOIC 8 5.46 x 5.41 x 2.03mm 5.46mm 5.41mm 2.03mm 5.5 V +70 °C
N° de stock RS 190-5176
Référence fabricantDS3234S#T&R
6,42 €
Each
Unité
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
N° de stock RS 190-5166
Référence fabricantDS3232SN#T&R
6,93 €
Each
Unité
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
N° de stock RS 732-7327
Référence fabricantDS1305EN+
5,11 €
Each
Unité
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
N° de stock RS 921-5721
Référence fabricantISL12020MIRZ
5,29 €
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 171-0195
Référence fabricantAB0805-T3
MarqueAbracon
0,676 €
Each (On a Reel of 3000)
Unité
- - - - - Surface Mount 16-VFQFN - - - - - - 85 °C
N° de stock RS 192-1541
Référence fabricantDS1338Z-18+
3,11 €
Each (In a Pack of 2)
Unité
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
N° de stock RS 169-8918
Référence fabricantBU9873F-GTE2
MarqueROHM
0,342 €
Each (On a Reel of 2500)
Unité
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount SOP 8 5.35 x 4.4 x 1.5mm 5.35mm 4.4mm 1.5mm 5.5 V +85 °C
N° de stock RS 190-4743
Référence fabricantDS1670E+
6,451 €
Each (In a Tube of 74)
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 191-4205
Référence fabricantDS1687-3+
10,051 €
Each (In a Tube of 14)
Unité
NV SRAM, Real Time Clock - - 242B Multiplexed Surface Mount EDIP 24 1.34 x 0.72 x 0.37mm 1.34mm 0.72mm 0.37mm 5.5 V +70 °C