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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

    个 (以每管裝提供)
    HK$27.95
    Renesas Electronics
    -
    DW:D:M:Y
    HH:MM:SS
    16B
    Serial-I2C
    -
    SOIC
    8
    -
    -
    -
    -
    -
    -
    • RS庫存編號 188-9366P
    • 製造零件編號 M41ST85WMX6TR
    个 (以每卷裝提供)
    HK$65.36
    STMicroelectronics
    Alarm, Battery Backup, Calendar, Watchdog Timer
    Binary, D:D:M:Y:C
    -
    64bit
    -
    Surface Mount
    SOX
    28
    18.01 x 7.67 x 2.39mm
    -
    18.01mm
    7.67mm
    2.39mm
    3.6 V
    个 (以每卷裝提供)
    HK$31.00
    Renesas Electronics
    Alarm, Battery Backup, Calendar, Clock, Power Fail
    DW:DM:M:Y
    HH:MM:SS
    2B
    Serial-I2C
    -
    MSOP
    8
    -
    -
    -
    -
    -
    -
    个 (以每卷裝提供)
    HK$25.60
    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 798-5260P
    • 製造零件編號 MCP79412-I/SN
    个 (以每管裝提供)
    HK$9.60
    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
    个 (以每卷裝提供)
    HK$23.56
    STMicroelectronics
    Calendar
    D:M:Y:C
    HH:MM:SS
    8B
    Serial-I2C
    Surface Mount
    SOIC
    8
    5 x 4 x 1.5mm
    -
    5mm
    4mm
    1.5mm
    5.5 V
    • RS庫存編號 828-9977P
    • 製造零件編號 M48T12-70PC1
    个 (以每管裝提供)
    HK$156.20
    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
    • RS庫存編號 205-3459P
    • 製造零件編號 X1B000371000112
    个 (以每卷裝提供)
    HK$32.68
    Epson
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    个 (以每卷裝提供)
    HK$21.90
    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
    • RS庫存編號 196-9068P
    • 製造零件編號 ISL12057IUZ
    个 (以每管裝提供)
    HK$23.10
    Renesas Electronics
    -
    DW:DM:M:Y
    HH:MM:SS
    -
    -
    -
    MSOP
    8
    -
    -
    -
    -
    -
    -
    个 (以每卷裝提供)
    HK$9.05
    NXP
    -
    -
    -
    128 bit, 128 bit
    -
    -
    TSSOP14, TSSOP14
    14, 14
    -
    -
    -
    -
    -
    -
    个 (以每卷裝提供)
    HK$17.60
    STMicroelectronics
    Real Time Clock
    DW:DM:M:Y
    HH:MM:SS
    8B
    Serial-2 Wire, Serial-I2C
    Surface Mount
    SOIC
    8
    5 x 4 x 1.5mm
    -
    5mm
    4mm
    1.5mm
    5.5 V
    个 (以每卷裝提供)
    HK$18.20
    STMicroelectronics
    Alarm, Calendar
    Binary, D:D:M:Y:C
    -
    -
    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 904-7512P
    • 製造零件編號 X1B000311000112
    个 (以每卷裝提供)
    HK$15.15
    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
    • RS庫存編號 823-7954P
    • 製造零件編號 MCP79511-I/MS
    个 (以每管裝提供)
    HK$11.646
    Microchip
    Calendar
    D:W:M:Y, LY
    HH, HS, MM, SS
    64B
    Serial-SPI
    Surface Mount
    MSOP
    10
    3 x 3 x 0.95mm
    -
    3mm
    3mm
    0.95mm
    3.6 V
    个 (以每卷裝提供)
    HK$38.80
    NXP
    -
    -
    -
    128 bit, 128 bit
    -
    -
    SO16, SO16
    16, 16
    -
    -
    -
    -
    -
    -
    • RS庫存編號 219-4639P
    • 製造零件編號 PCF8523T/1,118
    个 (以每卷裝提供)
    HK$7.49
    NXP
    -
    -
    -
    128 bit, 128 bit
    -
    -
    SO8, SO8
    8, 8
    -
    -
    -
    -
    -
    -
    个 (以每卷裝提供)
    HK$51.067
    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
    • RS庫存編號 667-6278P
    • 製造零件編號 Q41802551000111
    个 (以每卷裝提供)
    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
    个 (以每管裝提供)
    HK$54.55
    Renesas Electronics
    Alarm, Battery Backup, Calendar, Low Battery Detection
    DW:DM:M:Y
    SS:MM:HH
    128B
    Serial-I2C
    Surface Mount
    SOIC
    20
    13 x 7.6 x 2.35mm
    -
    13mm
    7.6mm
    2.35mm
    5.5 V
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