参数资料
型号: ICS854S01AKILF
厂商: IDT, Integrated Device Technology Inc
文件页数: 5/18页
文件大小: 0K
描述: IC CLOCK MUX 2:1 2.5GHZ 16-QFN
特色产品: LVDS Buffers and Muxes
标准包装: 100
系列: HiPerClockS™
类型: 多路复用器
电路数: 1
比率 - 输入:输出: 2:1
差分 - 输入:输出: 是/是
输入: LVDS,LVPECL
输出: LVDS
频率 - 最大: 2.5GHz
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: 16-VFQFN 裸露焊盘
供应商设备封装: 16-VFQFN(3x3)
包装: 管件
其它名称: 800-2561
ICS854S01AKI REVISION A OCTOBER 29, 2012
13
2012 Integrated Device Technology, Inc.
ICS854S01I Data Sheet
2:1 DIFFERENTIAL-TO-LVDS MULTIPLEXER
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS854S01I.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for theICS854S01I is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VDD = 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 = V
DD_MAX * IDD_MAX = 3.465V * 40mA = 138.6mW
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 =
JA * Pd_total + TA
Tj = Junction Temperature
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
JA must be used. Assuming no air flow and
a multi-layer board, the appropriate value is 74.7°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.139W * 74.7°C/W = 95.4°C. This is well 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 6. Thermal Resistance JA for 16 Lead VFQFN, Forced Convection
JA by Velocity
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
74.7°C/W
65.3°C/W
58.5°C/W
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