参数资料
型号: ICS8430S10BYI-02LFT
厂商: IDT, Integrated Device Technology Inc
文件页数: 16/31页
文件大小: 0K
描述: IC CLK GENERATOR PLL 48TQFP
标准包装: 1,000
类型: 时钟/频率发生器,扇出缓冲器(分配),多路复用器
PLL:
主要目的: Cavium 处理器
输入: LVCMOS,LVDS,LVPECL,LVTTL,SSTL,晶体
输出: LVCMOS,LVDS,LVPECL,LVTTL
电路数: 1
比率 - 输入:输出: 2:10
差分 - 输入:输出: 是/是
频率 - 最大: 133.33MHz
电源电压: 3.135 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 48-TQFP 裸露焊盘
供应商设备封装: 48-PTQFP-EP(7x7)
包装: 带卷 (TR)
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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