參數(shù)資料
型號: ICS8534AY-01LFT
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 7/21頁
文件大小: 0K
描述: IC CLOCK BUFFER MUX 2:22 64-TQFP
標(biāo)準(zhǔn)包裝: 500
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: 2:22
差分 - 輸入:輸出: 是/是
輸入: CML,HCSL,LVDS,LVHSTL,LVPECL,SSTL
輸出: LVPECL
頻率 - 最大: 500MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝: 64-TQFP-EP(10x10)
包裝: 帶卷 (TR)
其它名稱: 8534AY-01LFT
ICS8534AY-01 REVISION B MARCH 28, 2011
15
2011 Integrated Device Technology, Inc.
ICS8534-01 Data Sheet
LOW SKEW, 1-TO-22 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS8534-01.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS8534-01 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.465V, 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 * 230mA = 796.95mW
Power (outputs)MAX = 30mW/Loaded Output pair
If all outputs are loaded, the total power is 22 * 30mW = 660mW
Total Power_MAX (3.465V, with all outputs switching) = 796.95mW + 660mW = 1456.95mW
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 17.2°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 1.457W * 17.2°C/W = 110.1°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 6. Thermal Resistance θJA for 64 Lead TQFP, Forced Convection
θ
JA by Velocity
Linear Feet per Minute
0200
500
Multi-Layer PCB, JEDEC Standard Test Boards
22.3°C/W
17.2°C/W
15.1°C/W
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