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 alarmHow 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. 190-4745
Mfr. Part No.DS1682S+T&R
R 37.016
Each (On a Reel of 2500)
units
Alarm - - - - Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS stock no. 136-0685
Mfr. Part No.DS1371U+
R 35.70
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
New
RS stock no. 190-5182
Mfr. Part No.DS3234SN#T&R
R 131.40
Each
units
- - SS:MM:HH 256B Serial-SPI Surface Mount SO 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +85 °C
New
RS stock no. 189-7249
Mfr. Part No.DS3231MZ+
R 83.108
Each (In a Tube of 100)
units
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
RS stock no. 171-0537
Mfr. Part No.AB1815-T3
BrandAbracon
R 22.904
Each (In a Pack of 5)
units
- - - - - Surface Mount 16-VFQFN - - - - - - 85 °C
New
RS stock no. 189-8352
Mfr. Part No.DS1501YZN+
R 162.90
Each
units
Calendar YY:MM:DD HH:MM:SS 256B Parallel Surface Mount SOIC 28 18.1 x 7.6 x 2.35mm 18.1mm 7.6mm 2.35mm 5.5 V +85 °C
RS stock no. 169-8345
Mfr. Part No.ISL12022IBZ
BrandIntersil
R 54.543
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
New
RS stock no. 189-8609
Mfr. Part No.DS12887A+
R 149.00
Each
units
Alarm, Calendar Binary, DW:DM:M:Y Binary, HH:MM:SS 114B Multiplexed Through Hole EDIP 24 34.04 x 18.29 x 9.4mm 34.04mm 18.29mm 9.4mm 5.5 V +70 °C
New
RS stock no. 190-5750
Mfr. Part No.DS1338U-33+T&R
R 51.14
Each (In a Pack of 5)
units
- 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
RS stock no. 177-0656
Mfr. Part No.MCP79400-I/MS
BrandMicrochip
R 12.608
Each (In a Pack of 10)
units
- - HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
New
RS stock no. 191-3700
Mfr. Part No.DS1374U-33+T&R
R 52.008
Each (In a Pack of 5)
units
- - - - Serial-I2C Surface Mount μSOP 10 3.16 x 3.12 x 0.95mm 3.16mm 3.12mm 0.95mm 5.5 V +85 °C
RS stock no. 667-6224
Mfr. Part No.Q42724231000711
BrandEPSON
R 99.36
Each
units
Calendar DW:DM:M:Y HH:MM:SS - Parallel Surface Mount SOP 24 16.3 x 7.9 x 2.8mm 16.3mm 7.9mm 2.8mm 5.5 V +85 °C
RS stock no. 122-3408
Mfr. Part No.DS1340U-33+
R 68.494
Each (In a Tube of 25)
units
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount μSOP 8 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS stock no. 877-2772
Mfr. Part No.M41T0M6F
R 27.73
Each (In a Pack of 5)
units
Real Time Clock DW:DM:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS stock no. 732-7315
Mfr. Part No.DS1302ZN+
R 54.89
Each
units
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
RS stock no. 169-8223
Mfr. Part No.X1B000301000212
BrandEPSON
R 31.283
Each (On a Reel of 250)
units
Clock - SS:MM - Serial-I2C Surface Mount - 10 3.2 x 2.5 x 1mm 3.2mm 2.5mm 1mm 5.5 V +85 °C
New
RS stock no. 189-7212
Mfr. Part No.DS1307+
R 41.928
Each (In a Tube of 50)
units
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 stock no. 923-5785
Mfr. Part No.DS1305E+
R 67.354
Each (In a Tube of 74)
units
Alarm, Calendar DW:DM:M:Y HH:MM:SS 96B Serial-SPI Surface Mount TSSOP 20 6.5 x 4.4 x 0.9mm 6.5mm 4.4mm 0.9mm 5.5 V +70 °C