参数资料
型号: ICS84314AY-02LF
厂商: IDT, Integrated Device Technology Inc
文件页数: 10/23页
文件大小: 0K
描述: IC SYNTHESIZER 700MHZ 32-LQFP
标准包装: 250
系列: HiPerClockS™
类型: 频率合成器
PLL: 带旁路
输入: 晶体
输出: LVPECL
电路数: 1
比率 - 输入:输出: 1:4
差分 - 输入:输出: 无/是
频率 - 最大: 700MHz
除法器/乘法器: 是/无
电源电压: 3.135 V ~ 3.465 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 32-LQFP
供应商设备封装: 32-TQFP(7x7)
包装: 托盘
其它名称: 800-2281
84314AY-02LF
ICS84314AY-02LF-ND
ICS84314-02
700MHZ, CRYSTAL-TO-3.3V/2.5V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER
IDT / ICS 3.3V/2.5V LVPECL FREQUENCY SYNTHESIZER
18
ICS84314AY-02 REV. A MARCH 24, 2009
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS84314-02.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS84314-02 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
Power (core)MAX = VCC_MAX * IEE_MAX = 3.465V * 200mA = 693mW
Power (outputs)MAX = 30mW/Loaded Output Pair
If all outputs are loaded, the total power is 4 * 30mW = 120mW
Total Power_MAX (3.465V, with all outputs switching) = 693mW + 120mW = 813mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the device.
The maximum recommended junction temperature for HiPerClockS devices is 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 65.7°C/W per Table 8 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.813W * 65.7°C/W = 123.4°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 8. Thermal Resistance θJA for 32 Lead LQFP, Forced Convection
θ
JA by Velocity
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
65.7°C/W
55.9°C/W
52.4°C/W
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