Real Time Clocks | RTC | DS3231 | RS
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    Real Time Clocks

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    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, an 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 facilitates the performance of the software functions that are time dependant.

    Designed to run on ultra-low power consumption, RTCs often run on a lithium battery source but can also run on 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

    272 Products showing for Real Time Clocks

    Renesas Electronics
    Alarm, Battery Backup, Calendar, Switch Over
    DW:DM:M:Y
    HH:MM:SS
    128B
    Serial-I2C
    Surface Mount
    DFN
    20
    5.5 x 4 x 1.3mm
    -
    5.5mm
    4mm
    1.3mm
    5.5 V
    Microchip
    Battery Backup, Calendar, Clock, NV Timekeeping SRAM
    DW:DM:M:Y
    HH:MM:SS
    64B
    Serial-I2C
    Surface Mount
    SOIC
    8
    4.9 x 3.9 x 1.25mm
    -
    4.9mm
    3.9mm
    1.25mm
    5.5 V
    Epson
    Clock
    -
    SS:HH
    32bit
    Serial-I2C
    Surface Mount
    -
    10
    3.2 x 2.5 x 1mm
    -
    3.2mm
    2.5mm
    1mm
    5.5 V
    STMicroelectronics
    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
    STMicroelectronics
    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
    NXP
    -
    D:W:M:Y
    SS:MM:HH
    128bit
    Serial-SPI
    -
    SO20
    20
    -
    -
    -
    -
    -
    -
    NXP
    -
    D:W:M:Y
    SS:MM:HH
    128bit
    Serial-SPI
    -
    TSSOP14
    14
    -
    -
    -
    -
    -
    -
    STMicroelectronics
    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
    NXP
    Calendar, Clock
    YY:MM:DD:dd
    HH:MM:SS
    -
    Serial-2 Wire, Serial-I2C
    Surface Mount
    SOIC
    8
    5 x 4 x 1.45mm
    -
    5mm
    4mm
    1.45mm
    5.5 V
    Renesas Electronics
    -
    DW:DM:M:Y
    HH:MM:SS
    -
    -
    -
    MSOP
    8
    -
    -
    -
    -
    -
    -
    Microchip
    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
    STMicroelectronics
    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
    STMicroelectronics
    Timekeeper SRAM
    D:M:Y
    HH:MM:SS
    16kbit
    -
    Through Hole
    PCDIP
    24
    34.8 x 18.34 x 8.89mm
    -
    34.8mm
    18.34mm
    8.89mm
    5.5 V
    STMicroelectronics
    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
    SOH
    28
    18.49 x 8.89 x 2.69mm
    -
    18.49mm
    8.89mm
    2.69mm
    5.5 V
    Renesas Electronics
    Alarm, Backup Battery, Calender, Clock Output, EEPROM
    DW:DM:M:Y
    Binary
    16bit
    Serial-I2C
    -
    HMSOP 10
    8
    -
    -
    -
    -
    -
    -
    NXP
    -
    -
    -
    128 bit, 128 bit
    -
    -
    SO8, SO8
    8, 8
    -
    -
    -
    -
    -
    -
    Abracon
    -
    -
    -
    -
    -
    Surface Mount
    16-VFQFN
    -
    -
    -
    -
    -
    -
    -
    Microchip
    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
    Texas Instruments
    -
    -
    -
    -
    -
    -
    SOT-23-THIN
    6
    -
    -
    -
    -
    -
    -
    STMicroelectronics
    Calendar
    D:D:M:Y:C
    HH:MM:SS:HSS
    20B
    Serial-I2C
    Surface Mount
    SOIC
    8
    5 x 4 x 1.5mm
    -
    5mm
    4mm
    1.5mm
    5.5 V
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