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, a 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 facilitate the performance of the software functions that are time dependant. They are designed to run on an ultra-low power consumption, often run on a lithium battery source or 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 Price 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
New
RS Stock No. 196-9063
Mfr. Part No.ISL12020MIRZ
kr 57,675
Each (In a Pack of 2)
Units
- DW:DM:M:Y HH:MM:SS 128B - - DFN 20 - - - - - -
RS Stock No. 169-8293
Mfr. Part No.ISL12026IBZ
BrandIntersil
kr 25,33
Each (In a Tube of 98)
Units
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 512B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS Stock No. 189-8368
Mfr. Part No.DS3234S#
kr 73,18
Each
Units
SRAM DD:M:Y SS:MM:HH 256B Serial-SPI Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +70 °C
RS Stock No. 726-3949
Mfr. Part No.MCP79410-I/SN
BrandMicrochip
kr 8,076
Each (In a Pack of 5)
Units
Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 5.5 V +85 °C
RS Stock No. 714-0855
Mfr. Part No.M41T00SM6F
kr 23,33
Each
Units
- DW:DM:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.25mm 5mm 4mm 1.25mm 5.5 V +85 °C
RS Stock No. 169-8345
Mfr. Part No.ISL12022IBZ
BrandIntersil
kr 32,67
Each (In a Tube of 98)
Units
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 128B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS Stock No. 165-9065
Mfr. Part No.DS1302+
kr 29,26
Each (In a Tube of 50)
Units
Alarm, Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 31B Serial Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +70 °C
RS Stock No. 919-6337
Mfr. Part No.M48T18-100PC1
kr 162,611
Each (In a Tube of 12)
Units
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
RS Stock No. 923-1499
Mfr. Part No.ISL12020MIRZ
kr 47,935
Each (In a Tube of 53)
Units
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 128B Serial-I2C Surface Mount DFN 20 5.5 x 4 x 1.3mm 5.5mm 4mm 1.3mm 5.5 V +85 °C
RS Stock No. 825-1164
Mfr. Part No.MCP79411-I/MS
BrandMicrochip
kr 9,123
Each (In a Pack of 10)
Units
Calendar DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
RS Stock No. 191-5234
Mfr. Part No.DS1685S-5+
kr 47,65
Each (In a Tube of 30)
Units
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 Stock No. 165-9240
Mfr. Part No.DS1302SN+
kr 16,74
Each (In a Tube of 88)
Units
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
RS Stock No. 190-4733
Mfr. Part No.DS1339BU+
kr 29,581
Each (In a Tube of 50)
Units
Real Time Clock - 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
RS Stock No. 171-1637
Mfr. Part No.RV-2123-C2-STD-020
kr 45,012
Each (On a Tape of 100)
Units
Alarm, Calendar, Timer 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
RS Stock No. 761-9711
Mfr. Part No.DS1339U-33+T&R
kr 31,31
Each
Units
Battery Backup, Calendar YY:MM:DD 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
RS Stock No. 923-5794
Mfr. Part No.DS1305EN+
kr 44,656
Each (In a Tube of 74)
Units
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 Stock No. 190-4749
Mfr. Part No.DS3231S#T&R
kr 40,79
Each (On a Reel of 1000)
Units
Real Time Clock 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 +70 °C
New
RS Stock No. 191-4210
Mfr. Part No.DS3231MPMB1#
kr 185,04
Each
Units
Real Time Clock - - - Serial-I2C Surface Mount - 6 - - - - - +85 °C
RS Stock No. 165-2031
Mfr. Part No.MCP79522-I/MS
BrandMicrochip
kr 10,444
Each (In a Tube of 100)
Units
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS Stock No. 190-5189
Mfr. Part No.DS17287-5+
kr 128,91
Each
Units
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
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