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 169-8141
Référence fabricantQ41856471000111
MarqueEPSON
2,402 €
Each (On a Reel of 250)
Unité
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 20 - 7mm 5.4mm - 5.5 V +85 °C
N° de stock RS 810-3933
Référence fabricantMCP7940N-I/P
MarqueMicrochip
0,677 €
Each (In a Pack of 10)
Unité
Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 10.16mm 7.11mm 4.95mm 5.5 V +85 °C
N° de stock RS 729-3230
Référence fabricantRV-8564-C2-TA-010
5,11 €
Each
Unité
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
N° de stock RS 169-8145
Référence fabricantQ418564C2000511
MarqueEPSON
2,689 €
Each (On a Reel of 250)
Unité
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 12 - 3.6mm 2.4mm - 5.5 V +85 °C
N° de stock RS 189-7227
Référence fabricantDS1339U-33+
2,785 €
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 177-0905
Référence fabricantMCP795W10-I/SL
MarqueMicrochip
1,092 €
Each (In a Pack of 5)
Unité
- 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
N° de stock RS 190-5127
Référence fabricantDS1388Z-33+T&R
4,23 €
Each (In a Pack of 2)
Unité
Real Time Clock, Trickle Charger D:D:M:Y - - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 3.63 V +85 °C
N° de stock RS 667-6230
Référence fabricantQ41454351000111
MarqueEPSON
1,34 €
Each
Unité
Calendar, Timer - - - Serial Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
N° de stock RS 191-6881
Référence fabricantDS1050Z-001+
2,014 €
Each (In a Pack of 5)
Unité
Clock DM:M:DM:Y SS:MM:HH - - Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
N° de stock RS 169-8137
Référence fabricantQ41454351000111
MarqueEPSON
1,273 €
Each (On a Reel of 250)
Unité
Calendar, Timer - - - Serial Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
N° de stock RS 189-7221
Référence fabricantDS1337U+
1,762 €
Each (In a Tube of 50)
Unité
Real Time Clock D:D:M:Y:C SS:MM:HH - 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
Nouveau
N° de stock RS 216-7798
Référence fabricantMAX31343EKA+T
1,74 €
Each (On a Reel of 2500)
Unité
Alarm YY:MM:DD HH:MM:SS 64B Serial-I2C - WLP 8 - - - - - -
N° de stock RS 732-7315
Référence fabricantDS1302ZN+
3,49 €
Each
Unité
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 +85 °C
N° de stock RS 178-0558
Référence fabricantBU9873NUX-TTR
MarqueROHM
0,714 €
Each (In a Pack of 10)
Unité
Real Time Clock YY:MM:DD:DW HH:MM:SS - Serial-I2C Surface Mount VSON008X2030 8 2 x 3 x 0.58mm 2mm 3mm 0.85mm 5.5 V +85 °C
N° de stock RS 921-5396
Référence fabricantCDP68HC68T1M2Z
11,39 €
Each
Unité
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS 32B Serial-SPI Surface Mount SOIC W 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 6 V +85 °C
N° de stock RS 786-0749
Référence fabricantDS1337+
2,56 €
Each (In a Pack of 2)
Unité
Clock DD:M:Y SS:MM:HH 7B Serial-I2C Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +85 °C
N° de stock RS 732-7321
Référence fabricantDS1306E+
4,58 €
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 +70 °C
N° de stock RS 171-1640
Référence fabricantRV-3049-C2-TB-008
9,78 €
Each (On a Tape of 100)
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 204-2515
Référence fabricantMAX31343EKA+
2,436 €
Each (On a Tape of 10)
Unité
Real Time Clock - HH:MM:SS 64B - - WLP 8 - - - - - -
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