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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Omschrijving Prijs 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
RS-stocknr. 190-4729
FabrikantnummerDS1305E+T&R
FabrikantMaxim Integrated
2,22 €
Each (On a Reel of 2500)
Aantal stuks
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
RS-stocknr. 190-5162
FabrikantnummerDS1372U+
FabrikantMaxim Integrated
2,894 €
Each (In a Pack of 5)
Aantal stuks
Alarm, Binary Counter, Real Time Clock - - - Serial-I2C, Serial-SPI Surface Mount μSOP 8 3.1 x 0.65 x 0.95mm 3.1mm 0.65mm 0.95mm 5.5 V +85 °C
RS-stocknr. 189-7225
FabrikantnummerDS1338Z-33+
FabrikantMaxim Integrated
2,375 €
Each (In a Tube of 100)
Aantal stuks
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
RS-stocknr. 191-5234
FabrikantnummerDS1685S-5+
FabrikantMaxim Integrated
4,362 €
Each (In a Tube of 30)
Aantal stuks
NV SRAM, Real Time Clock - - 242B Multiplexed Surface Mount SO 24 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm 2.35mm 5.5 V +70 °C
RS-stocknr. 191-3287
FabrikantnummerDS1340C-33#T&R
FabrikantMaxim Integrated
2,753 €
Each (On a Reel of 1000)
Aantal stuks
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
RS-stocknr. 189-9414
FabrikantnummerDS1302Z+
FabrikantMaxim Integrated
3,11 €
Each (In a Pack of 5)
Aantal stuks
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
RS-stocknr. 732-7327
FabrikantnummerDS1305EN+
FabrikantMaxim Integrated
5,11 €
Each
Aantal stuks
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 +85 °C
RS-stocknr. 732-7318
FabrikantnummerDS1302S+
FabrikantMaxim Integrated
3,17 €
Each
Aantal stuks
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 +70 °C
RS-stocknr. 189-8457
FabrikantnummerDS1307+
FabrikantMaxim Integrated
3,798 €
Each (In a Pack of 5)
Aantal stuks
Alarm, Battery Backup, Calendar, Power Fail DW:DM:M:Y HH:MM:SS 56B Serial-I2C Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +70 °C
RS-stocknr. 797-9590
FabrikantnummerDS1746WP-120+
FabrikantMaxim Integrated
25,86 €
Each
Aantal stuks
Calendar YY:MM:DD HH:MM:SS 128 x 8bit Parallel Surface Mount Power Cap 34 25.27 x 23.62 x 0.81mm 25.27mm 23.62mm 0.81mm 0.6 V, 3.6 V +70 °C
RS-stocknr. 190-4730
FabrikantnummerDS1315-5+
FabrikantMaxim Integrated
11,20 €
Each (In a Tube of 25)
Aantal stuks
Real Time Clock, SRAM D:DM:M:Y - - - Through Hole PDIP 16 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm 5.5 V +70 °C
RS-stocknr. 189-7244
FabrikantnummerDS1687-5+
FabrikantMaxim Integrated
10,256 €
Each (In a Tube of 14)
Aantal stuks
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
RS-stocknr. 191-4715
FabrikantnummerDS12885S+
FabrikantMaxim Integrated
7,13 €
Each (In a Pack of 2)
Aantal stuks
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
RS-stocknr. 189-7217
FabrikantnummerDS1337+
FabrikantMaxim Integrated
2,132 €
Each (In a Tube of 50)
Aantal stuks
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
RS-stocknr. 190-5169
FabrikantnummerDS1682S+T&R
FabrikantMaxim Integrated
4,68 €
Each
Aantal stuks
Alarm - - - - Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS-stocknr. 191-6881
FabrikantnummerDS1050Z-001+
FabrikantMaxim Integrated
2,344 €
Each (In a Pack of 5)
Aantal stuks
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
RS-stocknr. 189-8394
FabrikantnummerDS3231S#
FabrikantMaxim Integrated
8,30 €
Each
Aantal stuks
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
RS-stocknr. 190-4747
FabrikantnummerDS17287-5+
FabrikantMaxim Integrated
12,021 €
Each (In a Tube of 14)
Aantal stuks
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
RS-stocknr. 189-7226
FabrikantnummerDS1339C-33#
FabrikantMaxim Integrated
4,562 €
Each (In a Tube of 46)
Aantal stuks
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 +85 °C
RS-stocknr. 165-9241
FabrikantnummerDS1302S+
FabrikantMaxim Integrated
2,598 €
Each (In a Tube of 88)
Aantal stuks
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 +70 °C