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. 624-8416
Mfr. Part No.M41T60Q6F
kr 16,072
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
RS Stock No. 732-7361
Mfr. Part No.DS1339C-33#
kr 54,64
Each
Units
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
New
RS Stock No. 196-9065
Mfr. Part No.ISL12022IBZ
kr 41,175
Each (In a Pack of 2)
Units
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
RS Stock No. 190-5159
Mfr. Part No.DS1672U-33+
kr 26,64
Each (In a Pack of 5)
Units
Binary Counter, Real Time Clock - - - 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. 190-4740
Mfr. Part No.DS1374U-18+
kr 28,103
Each (In a Tube of 50)
Units
Binary Counter, Real Time Clock, Trickle Charger - - - Serial-I2C Surface Mount μSOP 10 3.16 x 3.12 x 0.95mm 3.16mm 3.12mm 0.95mm 1.89 V +85 °C
RS Stock No. 761-9771
Mfr. Part No.DS1302Z+T&R
kr 31,11
Each
Units
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 31B Serial-3 Wire Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +70 °C
RS Stock No. 190-4737
Mfr. Part No.DS1340Z-33+T&R
kr 15,621
Each (On a Reel of 2500)
Units
Real Time Clock, Trickle Charger D:D:M:Y SS:MM:HH - Serial-I2C Surface Mount SO 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+
kr 27,876
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. 165-9387
Mfr. Part No.DS1338C-33#
kr 46,608
Each (In a Tube of 46)
Units
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
RS Stock No. 122-3408
Mfr. Part No.DS1340U-33+
kr 28,595
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. 192-1449
Mfr. Part No.DS1685E-3+
kr 53,59
Each (In a Pack of 2)
Units
Alarm, Calendar YY:MM:DD HH:MM:SS 128B Multiplexed Surface Mount TSSOP 24 7.9 x 4.5 x 0.95mm 7.9mm 4.5mm 0.95mm 5 V +70 °C
RS Stock No. 189-8595
Mfr. Part No.DS1305+
kr 55,535
Each (In a Pack of 2)
Units
Alarm, Calendar DW:DM:M:Y HH:MM:SS 96B Serial-SPI Through Hole PDIP 16 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm 5.5 V +70 °C
RS Stock No. 803-2229
Mfr. Part No.MCP795W21-I/ST
BrandMicrochip
kr 15,374
Each (In a Pack of 5)
Units
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount SOIC 14 8.65 x 3.9 x 1.25mm 8.65mm 3.9mm 1.25mm 3.6 V +85 °C
RS Stock No. 169-8140
Mfr. Part No.Q41457451000200
BrandEPSON
kr 20,817
Each (On a Reel of 250)
Units
Alarm, Calendar, Timer - - - Serial Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS Stock No. 189-8457
Mfr. Part No.DS1307+
kr 36,092
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. 921-5532
Mfr. Part No.CDP68HC68T1MZ
kr 101,99
Each
Units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS 32B Serial-SPI Surface Mount SOIC W 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 6 V +85 °C
RS Stock No. 177-0776
Mfr. Part No.MCP79401-I/SN
BrandMicrochip
kr 8,066
Each (In a Pack of 10)
Units
- - HH:MM:SS - Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 4.9mm 3.9mm 1.5mm 5.5 V +85 °C
RS Stock No. 817-3651
Mfr. Part No.MCP79410T-I/MNY
BrandMicrochip
kr 8,026
Each (On a Reel of 3300)
Units
Alarm, Battery Backup, Calendar, Clock DW:D:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount TDFN 8 2 x 3 x 0.75mm 2mm 3mm 0.75mm 5.5 V +85 °C
RS Stock No. 877-2784
Mfr. Part No.M41T93RMY6F
kr 37,348
Each (In a Pack of 5)
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. 170-8112
Mfr. Part No.ISL1208IU8Z-T7A
BrandIntersil
kr 24,877
Each (On a Reel of 250)
Units
Alarm, Calendar, Clock, SRAM DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
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