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 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 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 190-5189
Référence fabricantDS17287-5+
12,39 €
Each
Unité
NV SRAM, Real Time Clock D:DM:Y SS:MM:HH 114B Multiplexed Surface Mount EDIP 24 1.34 x 0.72 x 0.37mm 1.34mm 0.72mm 0.37mm 5.5 V +70 °C
N° de stock RS 191-3233
Référence fabricantDS1308U-33+
2,774 €
Each (In a Tube of 50)
Unité
NV SRAM, Real Time Clock DM:M:DW:Y SS:MM:HH - Serial-I2C Surface Mount μSOP 8 3.1 x 0.65 x 0.95mm 3.1mm 0.65mm 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 190-4745
Référence fabricantDS1682S+T&R
2,154 €
Each (On a Reel of 2500)
Unité
Alarm - - - - Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °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 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 191-3234
Référence fabricantDS1337U+T&R
1,099 €
Each (On a Reel of 3000)
Unité
Real Time Clock D:D:M:Y SS:MM:HH - Serial-I2C 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 189-7248
Référence fabricantDS2417P+
1,49 €
Each (In a Tube of 120)
Unité
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
N° de stock RS 189-8627
Référence fabricantDS1306+
5,125 €
Each (In a Pack of 2)
Unité
Alarm, Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 96B Serial-SPI Through Hole PDIP 16 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm 5.5 V +70 °C
N° de stock RS 192-1227
Référence fabricantDS1248Y-70+
26,694 €
Each (In a Tube of 10)
Unité
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
N° de stock RS 189-7195
Référence fabricantDS12887A+
7,571 €
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 189-7224
Référence fabricantDS1338Z-3+
2,219 €
Each (In a Tube of 100)
Unité
Clock M:M:DW SS:MM:HH 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 189-8326
Référence fabricantDS1339U-33+
3,40 €
Each (In a Pack of 2)
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 923-7462
Référence fabricantDS1305EN+T&R
2,182 €
Each (On a Reel of 2500)
Unité
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 96B Serial-3 Wire 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 189-7249
Référence fabricantDS3231MZ+
4,754 €
Each (In a Tube of 100)
Unité
Battery Backup, Calendar Binary 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 190-4734
Référence fabricantDS1339C-33#T&R
2,611 €
Each (On a Reel of 1000)
Unité
Alarm, Clock, Real Time Clock, Square Wave Output, Trickle Charger 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 +85 °C
N° de stock RS 189-8382
Référence fabricantDS1747-70+
32,61 €
Each
Unité
Calendar YY:MM:DD HH:MM:SS 512 x 8bit 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 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