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 907-4732
Référence fabricantM41ST87WMX6TR
6,35 €
Each (In a Pack of 2)
Unité
Calendar, Clock DD:MM:YY HH:MM:SS 128B Serial-I2C Surface Mount SOX 28 18.01 x 7.67 x 2.38mm 18.01mm 7.67mm 2.38mm 3.6 V +85 °C
N° de stock RS 205-3456
Référence fabricantX1B000311000112
MarqueEpson
0,927 €
Each (On a Reel of 250)
Unité
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
N° de stock RS 829-0355
Référence fabricantM41T81SM6F
2,242 €
Each (In a Pack of 5)
Unité
Calendar D:D:M:Y:C HH:MM:SS:HSS 20B 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 191-5740
Référence fabricantDS1251Y-70+
28,26 €
Each
Unité
NV SRAM, Real Time Clock D:DM:M:Y - - - Surface Mount EDIP 32 1.74 x 0.74 x 0.43mm 1.74mm 0.74mm 0.43mm - +70 °C
N° de stock RS 190-5750
Référence fabricantDS1338U-33+T&R
2,698 €
Each (In a Pack of 5)
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
N° de stock RS 540-4750
Référence fabricantDS1302Z+
3,12 €
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 +70 °C
N° de stock RS 732-7535
Référence fabricantDS2417P+
2,08 €
Each
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 190-4729
Référence fabricantDS1305E+T&R
2,121 €
Each (On a Reel of 2500)
Unité
Alarm, Real Time Clock, Trickle Charger DM:M:DW:Y SS:MM:HH 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 171-1646
Référence fabricantRV-4162-C7-TA-020
3,38 €
Each (On a Tape of 100)
Unité
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SMD 8 3.2 x 1.5 x 0.8mm 3.2mm 1.5mm 0.8mm 4.4 V +85 °C
N° de stock RS 189-7509
Référence fabricantDS1302Z+
2,284 €
Each (In a Tube of 100)
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 189-7225
Référence fabricantDS1338Z-33+
2,295 €
Each (In a Tube of 100)
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 190-4747
Référence fabricantDS17287-5+
11,314 €
Each (In a Tube of 14)
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 920-9004
Référence fabricantM48T58-70PC1
14,379 €
Each (In a Tube of 12)
Unité
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 8192B Parallel Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 39.88mm 18.34mm 8.89mm 5.5 V +70 °C
N° de stock RS 191-4238
Référence fabricantDS12885S+
5,341 €
Each (In a Tube of 30)
Unité
Alarm, Calendar, Clock - HH:MM:SS 144B Multiplexed Surface Mount SOIC 24 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm 2.35mm 5.5 V +70 °C
N° de stock RS 196-9070
Référence fabricantISL1208IB8Z-TK
2,154 €
Each (In a Pack of 5)
Unité
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
N° de stock RS 797-9427
Référence fabricantDS12R885S-33+
3,36 €
Each
Unité
Alarm, Leap Year, NV SRAM, Square Wave Output, Trickle Charger YY:MM:DD HH:MM:SS 114B Multiplexed Surface Mount SOIC 24 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm 2.35mm 5.5 V +85 °C
N° de stock RS 829-0444
Référence fabricantM41ST87WSS6F
5,62 €
Each
Unité
Calendar D:D:M:Y:C HH:MM:SS:HSS 128B Serial Surface Mount SSOP 20 7.5 x 5.6 x 1.85mm 7.5mm 5.6mm 1.85mm 3.6 V +85 °C
N° de stock RS 732-7311
Référence fabricantDS1302SN+
3,22 €
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 +85 °C
N° de stock RS 205-3457
Référence fabricantX1B000311000112
MarqueEpson
1,13 €
Each (In a Pack of 5)
Unité
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
N° de stock RS 177-0303
Référence fabricantMCP79401-I/SN
MarqueMicrochip
0,694 €
Each (In a Tube of 100)
Unité
- D:M:Y, DW HH:MM:SS - Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 4.9mm 3.9mm 1.5mm 5.5 V +85 °C