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. 732-7361
Mfr. Part No.DS1339C-33#
HK$52.48
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. 191-4210
Mfr. Part No.DS3231MPMB1#
HK$189.77
Each
units
Real Time Clock - - - Serial-I2C Surface Mount - 6 - - - - - +85 °C
RS Stock No. 165-5507
Mfr. Part No.M41T62LC6F
HK$17.623
Each (On a Reel of 1000)
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
RS Stock No. 823-7954
Mfr. Part No.MCP79511-I/MS
BrandMicrochip
HK$10.27
Each (In a Pack of 5)
units
Calendar D:W:M:Y, LY HH, HS, MM, SS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS Stock No. 146-0221
Mfr. Part No.MCP79521-I/MS
BrandMicrochip
HK$10.948
Each (In a Tube of 100)
units
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS Stock No. 729-3230
Mfr. Part No.RV-8564-C2-TA-010
HK$46.94
Each
units
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
RS Stock No. 786-0830
Mfr. Part No.DS3232MZ+
HK$68.04
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. 778-1484
Mfr. Part No.DS3231MZ+
HK$66.11
Each
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. 169-9339
Mfr. Part No.BU9873F-GTE2
BrandROHM
HK$7.07
Each (In a Pack of 10)
units
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount SOP 8 5.35 x 4.4 x 1.5mm 5.35mm 4.4mm 1.5mm 5.5 V +85 °C
RS Stock No. 189-8595
Mfr. Part No.DS1305+
HK$53.50
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. 786-0745
Mfr. Part No.DS1307N+
HK$34.23
Each (In a Pack of 2)
units
Clock DM:M:DW:Y SS:MM:HH 56B 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. 165-9065
Mfr. Part No.DS1302+
HK$27.30
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. 165-9482
Mfr. Part No.DS1338Z-3+
HK$22.93
Each (In a Tube of 100)
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. 786-0834
Mfr. Part No.DS3234S#
HK$73.51
Each
units
SRAM DD:M:Y SS:MM:HH 256B Serial-SPI Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +70 °C
RS Stock No. 189-8368
Mfr. Part No.DS3234S#
HK$74.60
Each
units
SRAM DD:M:Y SS:MM:HH 256B Serial-SPI Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +70 °C
RS Stock No. 192-1246
Mfr. Part No.DS1744W-120+
HK$253.248
Each (In a Tube of 12)
units
Calendar YY:MM:DD HH:MM:SS 32 x 8B Parallel Through Hole EDIP 28 39.37 x 18.8 x 10.67mm 39.37mm 18.8mm 10.67mm 0.6 V, 3.6 V +70 °C
RS Stock No. 797-9470
Mfr. Part No.DS1391U-3+
HK$31.68
Each (In a Pack of 2)
units
Calendar YY:MM:DD HH:MM:SS - Serial-SPI Surface Mount μMAX 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.3 V +85 °C
RS Stock No. 829-0444
Mfr. Part No.M41ST87WSS6F
HK$52.97
Each
units
Calendar D:D:M:Y:C HH:MM:SS:HSS 128B Serial Surface Mount SSOP 20 7.5 x 5.6 x 1.85mm 7.5mm 5.6mm 1.85mm 3.6 V +85 °C
RS Stock No. 732-7399
Mfr. Part No.DS1390U-33+
HK$32.10
Each
units
Battery Backup, Calendar, NV RAM 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. 921-5396
Mfr. Part No.CDP68HC68T1M2Z
HK$123.09
Each
units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS 32B Serial-SPI Surface Mount SOIC W 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 6 V +85 °C
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