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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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Part Details Brand Stock Functions Recently Introduced Date Format Time Format User RAM Bus Type Mounting Type Package Type Pin Count Dimensions Length Width Height Maximum Operating Supply Voltage Minimum Operating Supply Voltage Maximum Operating Temperature Minimum Operating Temperature
Microchip Technology MCP79401-I/SN, Real Time Clock (RTC) Serial-I2C, 8-Pin SOIC Microchip Technology 500 - - - 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 1.8 V +85 °C -40 °C
Microchip Technology MCP7940N-E/SN, Real Time Clock (RTC) Serial-I2C, 8-Pin SOIC Microchip Technology 380 - - - 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 1.8 V +125 °C -40 °C
Microchip Technology MCP795W10-I/SL, Real Time Clock (RTC) Serial-SPI, 14-Pin SOIC Microchip Technology 280 - - - HH:MM:SS - Serial-SPI Surface Mount SOIC 14 8.65 x 3.9 x 1.5mm 8.65mm 3.9mm 1.5mm 3.6 V 1.8 V +85 °C -40 °C
Microchip Technology MCP79400-I/MS, Real Time Clock (RTC) Serial-I2C, 8-Pin MSOP Microchip Technology 190 - - 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 1.8 V +85 °C -40 °C
Microchip Technology MCP79412-I/MS, Real Time Clock (RTC) Serial-I2C, 8-Pin MSOP Microchip Technology 40 - - - HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V 1.8 V +85 °C -40 °C
Microchip Technology MCP79400-I/MS, Real Time Clock (RTC) Serial-I2C, 8-Pin MSOP Microchip Technology 0 - - - HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V 1.8 V +85 °C -40 °C
Microchip Technology MCP79401-I/SN, Real Time Clock (RTC) Serial-I2C, 8-Pin SOIC Microchip Technology 0 - - - 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 1.8 V +85 °C -40 °C
Microchip Technology MCP7940N-E/SN, Real Time Clock (RTC) Serial-I2C, 8-Pin SOIC Microchip Technology 0 - - - 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 1.8 V +125 °C -40 °C
Microchip Technology MCP79412-I/MS, Real Time Clock (RTC) Serial-I2C, 8-Pin MSOP Microchip Technology 0 - - - HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V 1.8 V +85 °C -40 °C
Microchip Technology MCP795W10-I/SL, Real Time Clock (RTC) Serial-SPI, 14-Pin SOIC Microchip Technology 0 - - - HH:MM:SS - Serial-SPI Surface Mount SOIC 14 8.65 x 3.9 x 1.5mm 8.65mm 3.9mm 1.5mm 3.6 V 1.8 V +85 °C -40 °C
ROHM BU9873NUX-TTR, Real Time Clock (RTC) Serial-I2C, 8-Pin VSON008X2030
  • € 0.64
  • Each (On a Reel of 4000)
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  • RS Stock No. 177-9886
  • Brand ROHM
  • Mfr. Part No. BU9873NUX-TTR
ROHM 0 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 1.8 V +85 °C -40 °C
ROHM BU9873NUX-TTR, Real Time Clock (RTC) Serial-I2C, 8-Pin VSON008X2030
  • RS Stock No. 178-0558
  • Brand ROHM
  • Mfr. Part No. BU9873NUX-TTR
ROHM 0 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 1.8 V +85 °C -40 °C
Microchip MCP7940MT-I/SN, Real Time Clock (RTC) Serial-2 Wire, Serial-I2C, 8-Pin SOIC
  • € 0.54
  • Each (On a Reel of 3300)
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Microchip 26000 Calendar, Clock - DM:M:DW:Y HH:MM:SS - Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 4.9mm 3.9mm 1.5mm 5.5 V 1.8 V +85 °C -40 °C
STMicroelectronics M41T81M6F, Real Time Clock (RTC), 20B RAM Serial, 8-Pin SOIC STMicroelectronics 6595 Alarm - Binary HH:MM:SS:hh 20B Serial Surface Mount SOIC 8 5 x 4 x 1.25mm 5mm 4mm 1.25mm 5.5 V 2 V +85 °C -40 °C
STMicroelectronics M41T94MQ6F, Real Time Clock (RTC), 44B RAM Serial-SPI, 16-Pin SOIC STMicroelectronics 4935 Alarm, Battery Backup, Interrupt, NVRAM, Real Time Clock, Watchdog Timer - Binary, D:D:M:Y:C Binary, HH:MM:SS 44B Serial-SPI Surface Mount SOIC 16 10 x 4 x 1.6mm 10mm 4mm 1.6mm 5.5 V 2.7 V +85 °C -40 °C
STMicroelectronics M41T60Q6F, Real Time Clock (RTC), 8B RAM Serial-I2C, 16-Pin QFN STMicroelectronics 4920 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 1.3 V +85 °C -40 °C
STMicroelectronics M41ST87WMX6TR, Real Time Clock (RTC), 128B RAM Serial-I2C, 28-Pin SOX STMicroelectronics 3428 Calendar, Clock - DD:MM:YY HH:MM:SS 128B Serial-I2C Surface Mount SOX 28 18.01 x 7.67 x 2.38mm 18.01mm 7.67mm 2.38mm 3.6 V 2.7 V +85 °C -40 °C
Microchip MCP7940NT-I/MNY, Real Time Clock, 64B RAM Serial-2 Wire, Serial-I2C, 8-Pin TDFN Microchip 3250 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 1.8 V +85 °C -40 °C
STMicroelectronics M41T62LC6F, Real Time Clock (RTC), 16B RAM Serial, 8-Pin CLCC STMicroelectronics 2515 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 1.3 V +85 °C -40 °C
Microchip MCP7940MT-I/MNY, Real Time Clock (RTC), 64B RAM Serial-I2C, 8-Pin TDFN Microchip 2360 Calendar, NV SRAM - DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount TDFN 8 2 x 3 x 0.75mm 2mm 3mm 0.75mm 5.5 V 1.8 V +85 °C -40 °C
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