Revision 11 2-5 Thermal Characteristics Introduction The temperature variable in the Designer software refers to " />
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  • 參數(shù)資料
    型號(hào): A3PN030-ZQNG68
    廠商: Microsemi SoC
    文件頁數(shù): 26/114頁
    文件大?。?/td> 0K
    描述: IC FPGA NANO 30K GATES 68-QFN
    標(biāo)準(zhǔn)包裝: 260
    系列: ProASIC3 nano
    輸入/輸出數(shù): 49
    門數(shù): 30000
    電源電壓: 1.425 V ~ 1.575 V
    安裝類型: 表面貼裝
    工作溫度: 0°C ~ 70°C
    封裝/外殼: 68-VFQFN 裸露焊盤
    供應(yīng)商設(shè)備封裝: 68-QFN(8x8)
    ProASIC3 nano Flash FPGAs
    Revision 11
    2-5
    Thermal Characteristics
    Introduction
    The temperature variable in the Designer software refers to the junction temperature, not the ambient
    temperature. This is an important distinction because dynamic and static power consumption cause the
    chip junction to be higher than the ambient temperature.
    EQ 1 can be used to calculate junction temperature.
    TJ = Junction Temperature = T + TA
    EQ 1
    where:
    TA = Ambient Temperature
    T = Temperature gradient between junction (silicon) and ambient T = ja * P
    ja = Junction-to-ambient of the package. ja numbers are located in Table 2-5.
    P = Power dissipation
    Package Thermal Characteristics
    The device junction-to-case thermal resistivity is
    jc and the junction-to-ambient air thermal resistivity is
    ja. The thermal characteristics for ja are shown for two air flow rates. The absolute maximum junction
    temperature is 100°C. EQ 2 shows a sample calculation of the absolute maximum power dissipation
    allowed for a 484-pin FBGA package at commercial temperature and in still air.
    EQ 2
    Temperature and Voltage Derating Factors
    Maximum Power Allowed
    Max. junction temp. (
    C) Max. ambient temp. (C)
    ja(C/W)
    ------------------------------------------------------------------------------------------------------------------------------------------
    100
    C70C
    20.5
    C/W
    -------------------------------------
    1.463 W
    =
    Table 2-5 Package Thermal Resistivities
    Package Type
    Device
    Pin Count
    jc
    ja
    Units
    Still Air 200 ft./min.
    500 ft./min.
    Quad Flat No Lead (QFN)
    All devices
    48
    TBD
    C/W
    68
    TBD
    C/W
    100
    TBD
    C/W
    Very Thin Quad Flat Pack (VQFP)
    All devices
    100
    10.0
    35.3
    29.4
    27.1
    C/W
    Table 2-6 Temperature and Voltage Derating Factors for Timing Delays
    (normalized to TJ = 70°C, VCC = 1.425 V)
    Array Voltage VCC (V)
    Junction Temperature (°C)
    –40°C
    –20°C
    0°C
    25°C
    70°C
    85°C
    100°C
    1.425
    0.968
    0.973
    0.979
    0.991
    1.000
    1.006
    1.013
    1.500
    0.888
    0.894
    0.899
    0.910
    0.919
    0.924
    0.930
    1.575
    0.836
    0.841
    0.845
    0.856
    0.864
    0.870
    0.875
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