参数资料
型号: ICS8741004BGILFT
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 时钟及定时
英文描述: 8741004 SERIES, PLL BASED CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO24
封装: 4.40 X 7.80 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, TSSOP-24
文件页数: 8/20页
文件大小: 1988K
代理商: ICS8741004BGILFT
ICS8741004I
DIFFERENTIAL-TO-LVDS/0.7V DIFFERENTIAL PCI EXPRESS JITTER ATTENUATOR
PRELIMINARY
IDT / ICS PCI EXPRESS JITTER ATTENUATOR
16
ICS8741004BGI REV. B SEPTEMBER 27, 2007
3. Calculations and Equations.
The purpose of this section is to calculate power dissipation on the IC per HCSL output pair.
HCSL output driver circuit and termination are shown in Figure 8.
Figure 8. LVHSTL 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 VCCO – 2V.
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 /RL) * (VDD_MAX – VOH_MAX)
Pd_L = (VOL_MIN /RL) * (VDD_MAX – VOL_MIN)
Pd_H = (0.85V/50
) * (3.465V – 0.87V) = 44.1mW
Pd_L = (0.15V/50
) * 0.15V = 0.45mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 45mW
IC
VOU T
RL
50
VDD O
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