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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

    276 產品顯示為 Real Time Clocks

    HK$199.10
    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庫存編號 912-6943
    • 製造零件編號 MCP7940M-I/SN
    毎管:100 个
    HK$5.974
    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
    个(每托盘 2 )
    HK$71.27
    STMicroelectronics
    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
    HK$259.90
    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
    • RS庫存編號 196-9066
    • 製造零件編號 ISL12057IUZ
    毎管:50 个
    HK$14.952
    Renesas Electronics
    -
    DW:DM:M:Y
    HH:MM:SS
    -
    -
    -
    MSOP
    8
    -
    -
    -
    -
    -
    -
    • RS庫存編號 229-7087
    • 製造零件編號 TPL5010DDCR
    个(每托盘 25 )
    HK$4.116
    Texas Instruments
    -
    -
    -
    -
    -
    -
    SOT-23-THIN
    6
    -
    -
    -
    -
    -
    -
    • RS庫存編號 219-4640
    • 製造零件編號 PCF8563T/F4,118
    个(每带 2500 )
    HK$9.089
    NXP
    -
    D:W:M:Y
    SS:MM:HH
    128bit
    -
    -
    SO8
    8
    -
    -
    -
    -
    -
    -
    • RS庫存編號 166-1602
    • 製造零件編號 PCF8563TS/4,118
    个(每带 2500 )
    HK$9.927
    NXP
    Alarm, Battery Backup, Calendar, Watchdog Timer
    DW:DM:M:Y
    HH:MM:SS
    -
    Serial-I2C
    Surface Mount
    TSSOP
    8
    3.1 x 3.1 x 0.95mm
    -
    3.1mm
    3.1mm
    0.95mm
    5.5 V
    个(每托盘 10 )
    HK$9.05
    NXP
    -
    -
    -
    128 bit, 128 bit
    -
    -
    TSSOP14, TSSOP14
    14, 14
    -
    -
    -
    -
    -
    -
    个(每托盘 5 )
    HK$21.268
    STMicroelectronics
    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
    个(每带 1000 )
    HK$58.846
    STMicroelectronics
    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
    • RS庫存編號 196-9069
    • 製造零件編號 ISL1208IB8Z-TK
    个(每带 1000 )
    HK$15.231
    Renesas Electronics
    -
    DW:DM:M:Y
    HH:MM:SS
    -
    -
    -
    SOIC
    8
    -
    -
    -
    -
    -
    -
    • RS庫存編號 774-7403
    • 製造零件編號 MCP7940M-I/P
    个 (以毎袋:10)
    HK$7.00
    Microchip
    Alarm, Calendar
    DW:DM:M:Y
    HH:MM:SS
    64B
    Serial-I2C
    Through Hole
    PDIP
    8
    10.16 x 7.11 x 4.95mm
    -
    10.16mm
    7.11mm
    4.95mm
    5.5 V
    • RS庫存編號 667-6278
    • 製造零件編號 Q41802551000111
    HK$35.97
    Epson
    Alarm, Calendar, Timer
    -
    -
    -
    Serial-I2C
    Surface Mount
    SOP
    14
    5 x 10.1 x 3.2mm
    -
    5mm
    10.1mm
    3.2mm
    5.5 V
    • RS庫存編號 823-3712
    • 製造零件編號 MCP7940N-I/ST
    个(每托盘 10 )
    HK$9.04
    Microchip
    Calendar
    DW:D:M:Y
    HH:MM:SS
    64B
    Serial-I2C
    Surface Mount
    TSSOP
    8
    4.5 x 3.1 x 1.05mm
    -
    4.5mm
    3.1mm
    1.05mm
    5.5 V
    个(每托盘 10 )
    HK$10.773
    NXP
    -
    -
    -
    128 bit, 128 bit
    -
    -
    TSSOP8, TSSOP8
    8, 8
    -
    -
    -
    -
    -
    -
    个(每托盘 5 )
    HK$43.026
    NXP
    -
    -
    -
    128 bit, 128 bit
    -
    -
    SO20, SO20
    20, 20
    -
    -
    -
    -
    -
    -
    HK$27.64
    STMicroelectronics
    -
    DW:DM:M:Y
    HH:MM:SS
    8B
    Serial-2 Wire, Serial-I2C
    Surface Mount
    SOIC
    8
    5 x 4 x 1.25mm
    -
    5mm
    4mm
    1.25mm
    5.5 V
    HK$28.10
    STMicroelectronics
    Alarm, Battery Backup, Calendar, Watchdog Timer
    Binary, D:D:M:Y:C
    -
    32bit
    Serial-2 Wire, Serial-I2C
    Surface Mount
    SO
    8
    5 x 4 x 1.5mm
    -
    5mm
    4mm
    1.5mm
    5.5 V
    • RS庫存編號 810-3933
    • 製造零件編號 MCP7940N-I/P
    个(每托盘 10 )
    HK$12.79
    Microchip
    Calendar
    DW:DM:M:Y
    HH:MM:SS
    64B
    Serial-I2C
    Through Hole
    PDIP
    8
    10.16 x 7.11 x 4.95mm
    -
    10.16mm
    7.11mm
    4.95mm
    5.5 V
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