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 189-8629
Référence fabricantDS1338Z-33+
3,11 €
Each (In a Pack of 5)
Unité
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 56B 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 798-5254
Référence fabricantMCP7940N-I/MS
MarqueMicrochip
0,66 €
Each (In a Pack of 10)
Unité
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 64B 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 189-7238
Référence fabricantDS1391U-33+
2,502 €
Each (In a Tube of 50)
Unité
Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS - Serial-SPI Surface Mount μSOP 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
N° de stock RS 191-3287
Référence fabricantDS1340C-33#T&R
2,622 €
Each (On a Reel of 1000)
Unité
Clock, Real Time Clock, Trickle Charger D:D:M: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 +85 °C
N° de stock RS 189-7232
Référence fabricantDS1374C-33#
4,242 €
Each (In a Tube of 46)
Unité
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
N° de stock RS 190-4748
Référence fabricantDS1744-70IND+
24,453 €
Each (In a Tube of 12)
Unité
NV SRAM, Real Time Clock Y:M:D:D HH:MM:SS - - Through Hole EDIP 28 39.37 x 18.80 x 10.67mm 39.37mm 18.8mm 10.67mm 5 V +85 °C
N° de stock RS 189-8365
Référence fabricantDS1685EN-3+
6,07 €
Each (In a Pack of 2)
Unité
Alarm, Calendar YY:MM:DD HH:MM:SS 128B Multiplexed Surface Mount TSSOP 24 7.9 x 4.5 x 0.95mm 7.9mm 4.5mm 0.95mm 5 V +85 °C
N° de stock RS 169-9339
Référence fabricantBU9873F-GTE2
MarqueROHM
0,699 €
Each (In a Pack of 10)
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 189-9414
Référence fabricantDS1302Z+
3,11 €
Each (In a Pack of 5)
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 +70 °C
N° de stock RS 189-7194
Référence fabricantDS12887+
7,636 €
Each (In a Tube of 14)
Unité
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
N° de stock RS 165-9386
Référence fabricantDS1340C-33#
2,495 €
Each (In a Tube of 46)
Unité
Trickle Charger DD:M:Y SS:MM:HH 7B 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 189-7241
Référence fabricantDS1672S-33+
1,915 €
Each (In a Tube of 100)
Unité
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
N° de stock RS 732-7383
Référence fabricantDS1374U-33+
3,11 €
Each
Unité
Battery Backup, NV RAM Binary SS 3B Serial-I2C Surface Mount μSOP 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
Nouveau
N° de stock RS 216-7799
Référence fabricantMAX31343EKA+T
2,83 €
Each (In a Pack of 5)
Unité
Alarm YY:MM:DD HH:MM:SS 64B Serial-I2C - WLP 8 - - - - - -
N° de stock RS 192-1665
Référence fabricantDS1556-70+
31,70 €
Each
Unité
Alarm, NV SRAM, Watchdog Timer, Y2K YY:MM:DD HH:MM:SS - 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
N° de stock RS 189-7234
Référence fabricantDS1388Z-33+
3,231 €
Each (In a Tube of 100)
Unité
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 512B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 3.63 V +85 °C
N° de stock RS 188-9207
Référence fabricantM41T82SM6F
1,07 €
Each (On a Reel of 2500)
Unité
Alarm, Battery Backup, Calendar, Watchdog Timer Binary, D:D:M:Y:C - 32bit Serial-2 Wire, Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
N° de stock RS 168-6880
Référence fabricantM41T11MH6F
2,40 €
Each (On a Reel of 936)
Unité
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
N° de stock RS 171-1651
Référence fabricantRV-3029-C3-TA-QC-OPT.B
2,82 €
Each (On a Tape of 100)
Unité
Alarm, Battery Backup, Calendar, Clock D:W:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C Surface Mount SON 10 3.7 x 2.5 x 0.9mm 3.7mm 2.5mm 0.9mm 5.5 V +85 °C
N° de stock RS 171-1647
Référence fabricantRV-2123-C2-TA-010
5,64 €
Each (On a Tape of 100)
Unité
Calendar DW:DM:M:Y HH:MM:SS - Serial-SPI Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C