參數(shù)資料
型號: ICS8430S10BYI-02LF
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 16/31頁
文件大?。?/td> 0K
描述: IC CLK GENERATOR PLL 48TQFP
標準包裝: 250
類型: 時鐘/頻率發(fā)生器,扇出緩沖器(分配),多路復用器
PLL:
主要目的: Cavium 處理器
輸入: LVCMOS,LVDS,LVPECL,LVTTL,SSTL,晶體
輸出: LVCMOS,LVDS,LVPECL,LVTTL
電路數(shù): 1
比率 - 輸入:輸出: 2:10
差分 - 輸入:輸出: 是/是
頻率 - 最大: 133.33MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-TQFP 裸露焊盤
供應商設(shè)備封裝: 48-PTQFP-EP(7x7)
包裝: 托盤
ICS8430S10BYI-02 REVISION C JANUARY 17, 2011
23
2011 Integrated Device Technology, Inc.
ICS8430S10I-02 Data Sheet
CLOCK GENERATOR FOR CAVIUM PROCESSORS
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 125°C.
The equation for Tj is as follows: Tj =
θ
JA * Pd_total + TA
Tj = Junction Temperature
θ
JA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
θ
JA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 33.1°C/W per Table 7A below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.968W * 33.1°C/W = 117°C. This is below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow and the type of
board (multi-layer).
Table 7A. Thermal Resistance θJA for 48 Lead TQFP, EPAD Forced Convection
θ
JA Vs. Air Flow
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
33.1°C/W
27.2°C/W
25.7°C/W
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