參數(shù)資料
型號(hào): ICS85310AYI-11LF
廠商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 4/18頁(yè)
文件大小: 0K
描述: IC CLOCK BUFFER MUX 2:10 32-LQFP
標(biāo)準(zhǔn)包裝: 250
系列: HiPerClockS™
類型: 扇出緩沖器(分配),多路復(fù)用器
電路數(shù): 1
比率 - 輸入:輸出: 2:10
差分 - 輸入:輸出: 是/是
輸入: HCSL,LVDS,LVHSTL,LVPECL,SSTL
輸出: ECL,LVPECL
頻率 - 最大: 700MHz
電源電壓: 2.375 V ~ 3.8 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-LQFP
供應(yīng)商設(shè)備封裝: 32-TQFP(7x7)
包裝: 托盤(pán)
其它名稱: 85310AYI-11LF
ICS85310AYI-11 REVISION F JUNE 9, 2010
12
2010 Integrated Device Technology, Inc.
ICS85310I-11 Data Sheet
LOW SKEW, 1-TO-10 DIFFERENTIAL-TO-3.3V, 2.5V LVPECL/ECL FANOUT BUFFER
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS5311I-01.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS5311I-01 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.8V, 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 = 3.8V * 120mA = 456mW
Power (outputs)MAX = 30mW/Loaded Output pair
If all outputs are loaded, the total power is 10 * 30mW = 300mW
Total Power_MAX (3.8V, with all outputs switching) = 456mW + 300mW = 756mW
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 a moderate air
flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 42.1°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.756W * 42.1°C/W = 116.8°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 (single layer or multi-layer).
Table 6. Thermal Resistance θJA for 32 Lead LQFP, Forced Convection
θ
JA by Velocity
Linear Feet per Minute
0200
500
Single-Layer PCB, JEDEC Standard Test Boards
67.8°C/W
55.9°C/W
50.1°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
47.9°C/W
42.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
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