參數(shù)資料
型號(hào): ICS8536AG-02LF
廠商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 5/17頁(yè)
文件大小: 0K
描述: IC CLOCK BUFFER MUX 3:6 24-TSSOP
標(biāo)準(zhǔn)包裝: 62
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: 3:6
差分 - 輸入:輸出: 無(wú)/是
輸入: LVCMOS,LVTTL,晶體
輸出: LVPECL
頻率 - 最大: 266MHz
電源電壓: 2.375 V ~ 3.465 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 24-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 24-TSSOP
包裝: 管件
ICS8536AG-02 REVISION A JULY 21, 2010
13
2010 Integrated Device Technology, Inc.
ICS8536-02 Data Sheet
1-TO-6, DUALCRYSTAL/LVCMOS-TO-3.3V, 2.5V LVPECL FANOUT BUFFER
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS8536-02.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS8536-02 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 * 89mA = 308.385mW
Power (outputs)MAX = 30mW/Loaded Output pair
If all outputs are loaded, the total power is 6 * 30mW = 180mW
Total Power_MAX (3.3V, with all outputs switching) = 308.385mW + 180mW = 488.385mW
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 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 87.8°C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.488W * 87.8°C/W = 112.8°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 7. Thermal Resitance θJA for 24 Lead TSSOP, Forced Convection
θ
JA vs. Air Flow
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
87.8°C/W
83.5°C/W
81.3°C/W
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