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. 177-9886
Mfr. Part No.BU9873NUX-TTR
BrandROHM
SGD0.518
Each (On a Reel of 4000)
units
Real Time Clock - HH:MM:SS - Serial-I2C Surface Mount VSON008X2030 8 2 x 3 x 0.58mm 2mm 3mm 0.85mm 5.5 V +85 °C
RS Stock No. 169-9348
Mfr. Part No.BU9873FVM-GTTR
BrandROHM
SGD0.777
Each (In a Pack of 10)
units
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3.25 x 2.8 x 0.75mm 3.25mm 2.8mm 0.75mm 5.5 V +85 °C
RS Stock No. 178-0558
Mfr. Part No.BU9873NUX-TTR
BrandROHM
SGD0.778
Each (In a Pack of 10)
units
Real Time Clock - HH:MM:SS - Serial-I2C Surface Mount VSON008X2030 8 2 x 3 x 0.58mm 2mm 3mm 0.85mm 5.5 V +85 °C
RS Stock No. 169-9339
Mfr. Part No.BU9873F-GTE2
BrandROHM
SGD0.777
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. 169-9344
Mfr. Part No.BU9873FJ-GTE2
BrandROHM
SGD0.777
Each (In a Pack of 10)
units
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount SOP 8 5.25 x 3.9 x 1.37mm 5.25mm 3.9mm 1.37mm 5.5 V +85 °C
RS Stock No. 169-8920
Mfr. Part No.BU9873FVM-GTTR
BrandROHM
SGD0.53
Each (On a Reel of 3000)
units
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3.25 x 2.8 x 0.75mm 3.25mm 2.8mm 0.75mm 5.5 V +85 °C
RS Stock No. 169-8918
Mfr. Part No.BU9873F-GTE2
BrandROHM
SGD0.53
Each (On a Reel of 2500)
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
New
RS Stock No. 185-1011
Mfr. Part No.BU9873FVT-GE2
BrandROHM
SGD0.916
Each (In a Pack of 10)
units
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 4.4 x 3 x 1mm 4.4mm 3mm 1mm 5.5 V +85 °C
New
RS Stock No. 185-0951
Mfr. Part No.BU9873FVT-GE2
BrandROHM
SGD0.50
Each (On a Reel of 3000)
units
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 4.4 x 3 x 1mm 4.4mm 3mm 1mm 5.5 V +85 °C
RS Stock No. 169-8919
Mfr. Part No.BU9873FJ-GTE2
BrandROHM
SGD0.53
Each (On a Reel of 2500)
units
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount SOP 8 5.25 x 3.9 x 1.37mm 5.25mm 3.9mm 1.37mm 5.5 V +85 °C