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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

    240 Products showing for Real Time Clocks

    • RS Stock No. 229-7087
    • Mfr. Part No. TPL5010DDCR
    Each (In a Pack of 25)
    MYR2.306
    Texas Instruments
    -
    -
    -
    -
    -
    -
    SOT-23-THIN
    6
    -
    -
    -
    -
    -
    -
    • RS Stock No. 229-7087P
    • Mfr. Part No. TPL5010DDCR
    Each (Supplied on a Reel)
    MYR2.306
    Texas Instruments
    -
    -
    -
    -
    -
    -
    SOT-23-THIN
    6
    -
    -
    -
    -
    -
    -
    • RS Stock No. 205-3455
    • Mfr. Part No. X1B000242000112
    Each (In a Pack of 5)
    MYR8.404
    Epson
    Real Time Clock
    -
    -
    128bit
    -
    -
    SOP-14
    14
    -
    -
    -
    -
    -
    -
    Each (In a Pack of 5)
    MYR9.826
    Abracon
    Alarm, Calendar, Clock, Timer
    YY:MM:DD:dd
    HH:MM:SS
    256B
    Serial-SPI
    -
    QFN
    16
    -
    -
    -
    -
    -
    -
    Each (In a Pack of 5)
    MYR6.07
    Microchip
    Battery Backup, Calendar, NV 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
    Each
    MYR154.80
    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
    • RS Stock No. 177-0837
    • Mfr. Part No. MCP7940N-E/SN
    Each (In a Pack of 10)
    MYR5.472
    Microchip
    -
    D:M:Y, DW
    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
    • RS Stock No. 171-0522
    • Mfr. Part No. AB1805-T3
    Each (In a Pack of 5)
    MYR9.758
    Abracon
    -
    -
    -
    -
    -
    -
    16-VFQFN
    -
    -
    -
    -
    -
    -
    -
    Each (In a Pack of 5)
    MYR3.484
    Microchip
    Calendar, NV 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
    • RS Stock No. 240-0845
    • Mfr. Part No. AB-RTCMC-32.768KHZ-AIGZ-S7-T
    Each (In a Pack of 2)
    MYR23.525
    Abracon
    Clock
    YY:MM:DD:dd
    HH:MM:SS:hh
    -
    Serial-I2C
    -
    SMD
    8
    -
    -
    -
    -
    -
    -
    • RS Stock No. 177-0776
    • Mfr. Part No. MCP79401-I/SN
    Each (In a Pack of 10)
    MYR5.434
    Microchip
    -
    D:M:Y, DW
    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
    Each (In a Pack of 10)
    MYR4.633
    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
    • RS Stock No. 171-0508
    • Mfr. Part No. AB0805-T3
    Each (In a Pack of 5)
    MYR11.618
    Abracon
    -
    -
    -
    -
    -
    Surface Mount
    16-VFQFN
    -
    -
    -
    -
    -
    -
    -
    Each
    MYR178.71
    STMicroelectronics
    Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection
    DW:DM:M:Y
    HH:MM:SS
    32768B
    Parallel
    Through Hole
    PCDIP
    28
    39.88 x 18.34 x 8.89mm
    -
    39.88mm
    18.34mm
    8.89mm
    5.5 V
    Each (In a Pack of 10)
    MYR5.79
    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
    Each (In a Pack of 5)
    MYR7.002
    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
    Each (In a Pack of 10)
    MYR4.774
    Microchip
    Calendar
    DW:DM:M:Y
    HH:MM:SS
    64B
    Serial-2 Wire, Serial-I2C
    Surface Mount
    SOIC
    8
    4.9 x 3.9 x 1.5mm
    -
    4.9mm
    3.9mm
    1.5mm
    2.5 V
    Each
    MYR112.45
    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
    • RS Stock No. 171-0537
    • Mfr. Part No. AB1815-T3
    Each (In a Pack of 5)
    MYR11.382
    Abracon
    -
    -
    -
    -
    -
    Surface Mount
    16-VFQFN
    -
    -
    -
    -
    -
    -
    -
    Each (Supplied in a Tube)
    MYR57.39
    Maxim Integrated
    Real Time Clock, SRAM
    DM:M:DW:Y
    SS:MM:HH
    -
    Multiplexed
    Surface Mount
    TSSOP
    20
    6.6 x 4.5 x 0.95mm
    -
    6.6mm
    4.5mm
    0.95mm
    3.63 V
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