參數(shù)資料
型號: ICS843251BGI-15LFT
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 4/16頁
文件大?。?/td> 0K
描述: IC CLK GEN ETHERNET 25MHZ 8TSSOP
標準包裝: 2,500
系列: HiPerClockS™, FemtoClock™
類型: 時鐘發(fā)生器
PLL:
輸入: 晶體
輸出: LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 無/是
頻率 - 最大: 750MHz
除法器/乘法器: 是/是
電源電壓: 2.375 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 8-TSSOP
包裝: 帶卷 (TR)
ICS843251I-15
FEMTOCLOCKCRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
IDT / ICS 3.3V, 2.5V LVPECL CLOCK GENERATOR
12
ICS843S51BGI-15 REV. A NOVEMBER 2, 2012
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in Figure 7.
Figure 7. LVPECL Driver Circuit and Termination
To calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination voltage
of VCC – 2V.
For logic high, VOUT = VOH_MAX = VCC_MAX – 0.9V
(VCC_MAX – VOH_MAX) = 0.9V
For logic low, VOUT = VOL_MAX = VCC_MAX – 1.7V
(VCC_MAX – VOL_MAX) = 1.7V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(VOH_MAX – (VCC_MAX – 2V))/RL] * (VCC_MAX – VOH_MAX) = [(2V – (VCC_MAX – VOH_MAX))/RL] * (VCC_MAX – VOH_MAX) =
[(2V – 0.9V)/50
] * 0.9V = 19.8mW
Pd_L = [(VOL_MAX – (VCC_MAX – 2V))/RL] * (VCC_MAX – VOL_MAX) = [(2V – (VCC_MAX – VOL_MAX))/RL] * (VCC_MAX – VOL_MAX) =
[(2V – 1.7V)/50
] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
V
OUT
V
CC
V
CC - 2V
Q1
RL
50
Ω
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