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. 191-3700
Mfr. Part No.DS1374U-33+T&R
kr 25,104
Each (In a Pack of 5)
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 5.5 V +85 °C
RS Stock No. 189-8536
Mfr. Part No.DS1374U-33+
kr 29,512
Each (In a Pack of 5)
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. 189-8635
Mfr. Part No.DS1337S+
kr 25,902
Each (In a Pack of 5)
Units
Calendar DW:DM:M:Y 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. 190-5155
Mfr. Part No.DS1315-5+
kr 131,01
Each
Units
Real Time Clock, SRAM D:DM:M:Y - - - 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. 177-0302
Mfr. Part No.MCP79400-I/MS
BrandMicrochip
kr 6,985
Each (In a Tube of 100)
Units
- D:M:Y, DW HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
RS Stock No. 188-9204
Mfr. Part No.M41ST85WMX6TR
kr 34,002
Each (On a Reel of 1000)
Units
Alarm, Battery Backup, Calendar, Watchdog Timer Binary, D:D:M:Y:C - 64bit - Surface Mount SOX 28 18.01 x 7.67 x 2.39mm 18.01mm 7.67mm 2.39mm 3.6 V +85 °C
RS Stock No. 189-7238
Mfr. Part No.DS1391U-33+
kr 28,219
Each (In a Tube of 50)
Units
Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS - Serial-SPI 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. 165-1954
Mfr. Part No.MCP795W22-I/SL
BrandMicrochip
kr 11,43
Each (In a Tube of 57)
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. 190-4742
Mfr. Part No.DS1390U-33+T&R
kr 15,335
Each (On a Reel of 3000)
Units
Trickle Charger - - - Serial-SPI Surface Mount μSOP 10 3.16 x 3.12 x 0.95mm 3.16mm 3.12mm 0.95mm 5.5 V +85 °C
New
RS Stock No. 196-9068
Mfr. Part No.ISL12057IUZ
kr 22,412
Each (In a Pack of 5)
Units
- DW:DM:M:Y HH:MM:SS - - - MSOP 8 - - - - - -
RS Stock No. 662-4722
Mfr. Part No.BQ4802LYPW
kr 37,10
Each
Units
Alarm, Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 16B Parallel Surface Mount TSSOP 28 9.7 x 4.4 x 1.15mm 9.7mm 4.4mm 1.15mm 3.6 V +70 °C
RS Stock No. 923-5781
Mfr. Part No.DS1306E+
kr 43,254
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 +70 °C
RS Stock No. 714-0855
Mfr. Part No.M41T00SM6F
kr 24,13
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. 189-7225
Mfr. Part No.DS1338Z-33+
kr 25,212
Each (In a Tube of 100)
Units
Battery Backup, Calendar, NV RAM DW:DM:M:Y 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
RS Stock No. 191-4204
Mfr. Part No.DS1251Y-70+
kr 285,501
Each (In a Tube of 10)
Units
NV SRAM, Real Time Clock D:DM:M:Y - - - Surface Mount EDIP 32 1.74 x 0.74 x 0.43mm 1.74mm 0.74mm 0.43mm - +70 °C
RS Stock No. 171-0195
Mfr. Part No.AB0805-T3
BrandAbracon
kr 6,742
Each (On a Reel of 3000)
Units
- - - - - Surface Mount 16-VFQFN - - - - - - 85 °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. 829-0399
Mfr. Part No.M41T11M6F
kr 30,986
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
RS Stock No. 824-6447
Mfr. Part No.MCP7940NT-I/MNY
BrandMicrochip
kr 6,288
Each (In a Pack of 10)
Units
Calendar, Clock DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount TDFN 8 3 x 2 x 0.75mm 3mm 2mm 0.75mm 5.5 V +85 °C
RS Stock No. 190-5182
Mfr. Part No.DS3234SN#T&R
kr 80,46
Each
Units
Crystal, Real Time Clock, SRAM D:D:M:Y 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
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