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
RS Stock No. 624-8466
Mfr. Part No.M48T35Y-70PC1
€22.81
Each
units
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 32768B 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. 165-5486
Mfr. Part No.M41T83SQA6F
€1.52
Each (On a Reel of 1000)
units
Real Time Clock DW:DM:M:Y HH:MM:SS:hh 32B Serial-2 Wire, Serial-I2C Surface Mount QFN 16 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5.5 V +85 °C
RS Stock No. 877-2781
Mfr. Part No.M41T83SQA6F
€2.814
Each (In a Pack of 5)
units
Real Time Clock DW:DM:M:Y HH:MM:SS:hh 32B Serial-2 Wire, Serial-I2C Surface Mount QFN 16 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5.5 V +85 °C
RS Stock No. 920-9001
Mfr. Part No.M48T35Y-70PC1
€21.263
Each (In a Tube of 12)
units
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 32768B 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. 704-4647
Mfr. Part No.ISL12022IBZ
€3.99
Each
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. 189-8698
Mfr. Part No.DS1337+
€2.682
Each (In a Pack of 5)
units
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 Stock No. 190-4748
Mfr. Part No.DS1744-70IND+
€27.098
Each (In a Tube of 12)
units
NV SRAM, Real Time Clock Y:M:D:D HH:MM:SS - - Through Hole EDIP 28 39.37 x 18.80 x 10.67mm 39.37mm 18.8mm 10.67mm 5 V +85 °C
RS Stock No. 732-7383
Mfr. Part No.DS1374U-33+
€3.41
Each
units
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
RS Stock No. 761-3903
Mfr. Part No.DS1305EN+T&R
€4.83
Each
units
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 96B Serial-3 Wire 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. 732-7315
Mfr. Part No.DS1302ZN+
€3.71
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. 165-5488
Mfr. Part No.M41T93RMY6F
€1.937
Each (On a Reel of 1000)
units
Real Time Clock DW:DM:M:Y HH:MM:SS:hh 32B Serial-4 Wire, Serial-I2C Surface Mount SOX 18 11.66 x 7.67 x 2.39mm 11.66mm 7.67mm 2.39mm 5.5 V +85 °C
RS Stock No. 189-8457
Mfr. Part No.DS1307+
€3.62
Each (In a Pack of 5)
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. 817-3667
Mfr. Part No.MCP79410T-I/ST
BrandMicrochip
€0.77
Each (On a Reel of 2500)
units
Alarm, Battery Backup, Calendar, Clock DW:D:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 3.1mm 4.5mm 1.05mm 5.5 V +85 °C
RS Stock No. 518-429
Mfr. Part No.ISL1208IB8Z
BrandIntersil
€2.172
Each (In a Pack of 5)
units
Alarm, Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 2B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS Stock No. 169-8136
Mfr. Part No.Q42724231000711
BrandEPSON
€5.289
Each (In a Tube of 25)
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. 761-7624
Mfr. Part No.MCP7940MT-I/MNY
BrandMicrochip
€0.594
Each (On a Tape of 5)
units
Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount TDFN 8 2 x 3 x 0.75mm 2mm 3mm 0.75mm 5.5 V +85 °C
RS Stock No. 190-4749
Mfr. Part No.DS3231S#T&R
€4.091
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
RS Stock No. 727-5743
Mfr. Part No.PCA8565TS/1,118
BrandNXP
€1.41
Each (In a Pack of 2)
units
Alarm, Calendar, Interrupt, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +125 °C
RS Stock No. 786-0751
Mfr. Part No.DS1338Z-3+
€3.185
Each (In a Pack of 2)
units
Clock M:M:DW SS:MM:HH 56B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS Stock No. 624-8416
Mfr. Part No.M41T60Q6F
€0.65
Each (In a Pack of 5)
units
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 8B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
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