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. 169-8219
Mfr. Part No.X1B000172000112
BrandEPSON
kr 22,818
Each (On a Reel of 250)
Units
Alarm, Calendar, Event Detection and Timestamp, Power Switching, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SOP 14 10.1 x 5 x 3.15mm 10.1mm 5mm 3.15mm 5.5 V +85 °C
RS Stock No. 190-5219
Mfr. Part No.DS3231S#T&R
kr 73,78
Each
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. 190-4739
Mfr. Part No.DS1372U+
kr 21,988
Each (In a Tube of 50)
Units
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 Stock No. 829-0399
Mfr. Part No.M41T11M6F
kr 30,19
Each (In a Pack of 5)
Units
Calendar D:D:M:Y:C 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
New
RS Stock No. 196-9066
Mfr. Part No.ISL12057IUZ
kr 18,77
Each (In a Tube of 50)
Units
- DW:DM:M:Y HH:MM:SS - - - MSOP 8 - - - - - -
RS Stock No. 169-8222
Mfr. Part No.X1B000311000112
BrandEPSON
kr 32,178
Each (On a Tape of 20)
Units
Clock - SS:HH 32bit Serial-I2C Surface Mount - 10 3.2 x 2.5 x 1mm 3.2mm 2.5mm 1mm 5.5 V +85 °C
RS Stock No. 761-9787
Mfr. Part No.DS1302S+T&R
kr 31,51
Each
Units
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 31B Serial-3 Wire Surface Mount SOIC 8 5.46 x 5.41 x 2.03mm 5.46mm 5.41mm 2.03mm 5.5 V +70 °C
New
RS Stock No. 190-4740
Mfr. Part No.DS1374U-18+
kr 18,235
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. 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. 189-8627
Mfr. Part No.DS1306+
kr 53,24
Each (In a Pack of 2)
Units
Alarm, Battery Backup, 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. 786-0830
Mfr. Part No.DS3232MZ+
kr 69,29
Each
Units
Calendar DD:M:Y SS:MM:HH 236B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 4.5 V +85 °C
RS Stock No. 813-5779
Mfr. Part No.RV-3049-C3-TA-QC-Opt.A
kr 55,43
Each
Units
Alarm, Battery Backup, Calendar, Clock D:W:M:Y HH:MM:SS 8B Serial-4 Wire, Serial-SPI Surface Mount SON 10 3.7 x 2.5 x 0.9mm 3.7mm 2.5mm 0.9mm 5.5 V +85 °C
RS Stock No. 189-8563
Mfr. Part No.DS12887+
kr 87,44
Each
Units
Alarm, Battery Backup, Calendar, Power Fail Binary, DW:DM:M:Y Binary, HH:MM:SS 114B 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 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
RS Stock No. 732-7324
Mfr. Part No.DS1305E+
kr 49,35
Each
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
RS Stock No. 189-7214
Mfr. Part No.DS1307Z+T&R
kr 14,404
Each (On a Reel of 2500)
Units
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 56B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +70 °C
RS Stock No. 190-4747
Mfr. Part No.DS17287-5+
kr 113,679
Each (In a Tube of 14)
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
RS Stock No. 798-5258
Mfr. Part No.MCP7940N-I/SN
BrandMicrochip
kr 6,63
Each (In a Pack of 10)
Units
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 64B 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. 189-8643
Mfr. Part No.DS1390U-3+
kr 34,695
Each (In a Pack of 2)
Units
Trickle Charger DD:M:Y SS:MM:HH - Serial-SPI Surface Mount μMAX 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 3.3 V +85 °C
RS Stock No. 880-5342
Mfr. Part No.M41T62LC6F
kr 33,778
Each (In a Pack of 5)
Units
Alarm, Calendar, Real Time Clock, Square Wave Output, Watchdog Timer Binary, D:D:M:Y:C Binary, HH:MM:SS 16B Serial Surface Mount CLCC 8 3.3 x 1.6 x 0.8mm 3.3mm 1.6mm 0.8mm 4.4 V +85 °C
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