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 189-7239
Référence fabricantDS1394U-33+
3,332 €
Each (In a Tube of 50)
Unité
Trickle Charger DD:M:Y SS:MM:HH - Serial-SPI Surface Mount μMAX 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
N° de stock RS 786-0758
Référence fabricantDS1338C-33#
4,96 €
Each
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 205-3454
Référence fabricantX1B000242000112
MarqueEpson
1,074 €
Each (On a Reel of 250)
Unité
Real Time Clock - - 128bit - - SOP-14 14 - - - - - -
N° de stock RS 188-9205
Référence fabricantM41T80M6F
1,064 €
Each (On a Reel of 2500)
Unité
Alarm, Calendar Binary, D:D:M:Y:C - - 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 189-7252
Référence fabricantDS3232MZ+
5,272 €
Each (In a Tube of 100)
Unité
Calendar DD:M:Y SS:MM:HH 236B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 4.5 V +85 °C
N° de stock RS 190-5835
Référence fabricantDS1339C-33#T&R
5,95 €
Each (In a Pack of 2)
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 921-5396
Référence fabricantCDP68HC68T1M2Z
12,53 €
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 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 578-831
Référence fabricantM41T65Q6F
1,892 €
Each (In a Pack of 5)
Unité
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS:hh 16B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
N° de stock RS 189-8692
Référence fabricantDS1390U-33+
3,792 €
Each (In a Pack of 5)
Unité
Battery Backup, Calendar, NV RAM 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 189-8536
Référence fabricantDS1374U-33+
3,08 €
Each (In a Pack of 5)
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
N° de stock RS 192-1227
Référence fabricantDS1248Y-70+
34,07 €
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 189-8372
Référence fabricantDS1687-5+
12,84 €
Each
Unité
Alarm, Battery Backup, Calendar Binary, DW:DM:M:Y Binary, HH:MM:SS 242B 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 196-9070
Référence fabricantISL1208IB8Z-TK
2,368 €
Each (In a Pack of 5)
Unité
- DW:DM:M:Y HH:MM:SS - - - SOIC 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 190-7170
Référence fabricantDS1904L-F5#
10,47 €
Each
Unité
- - - - - - - - - - - - - -
N° de stock RS 169-8134
Référence fabricantQ42724211000200
MarqueEPSON
4,684 €
Each (In a Tube of 25)
Unité
Calendar DW:DM:M:Y HH:MM:SS - Parallel Through Hole PDIP 18 23.1 x 6.3 x 4.2mm 23.1mm 6.3mm 4.2mm 5.5 V +70 °C
N° de stock RS 165-2097
Référence fabricantMCP79511-I/MS
MarqueMicrochip
0,924 €
Each (In a Tube of 100)
Unité
Calendar D:W:M:Y, LY HH, HS, MM, SS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
N° de stock RS 686-5036
Référence fabricantM48T58-70PC1
17,73 €
Each
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 191-4204
Référence fabricantDS1251Y-70+
36,394 €
Each (In a Tube of 10)
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