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ICS8520DYI-02T Datasheet(PDF) 9 Page - Integrated Circuit Systems

Part No. ICS8520DYI-02T
Description  LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER
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Maker  ICST [Integrated Circuit Systems]
Homepage  http://www.icst.com
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ICS8520DYI-02T Datasheet(HTML) 9 Page - Integrated Circuit Systems

 
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8520DYI-02
www.icst.com/products/hiperclocks.html
REV.B NOVEMBER 16, 2005
9
Integrated
Circuit
Systems, Inc.
ICS8520I-02
LOW SKEW, 1-TO-16
DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVHSTL output driver circuit and termination are shown in Figure 2.
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load.
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = (V
OH_MIN
/R
L
) * (V
DDO_MAX
- V
OH_MIN
)
Pd_L = (V
OL_MAX
/R
L
) * (V
DDO_MAX
- V
OL_MAX
)
Pd_H = (0.9V/50Ω) * (2V - 0.9V) = 19.8mW
Pd_L = (0.4V/50Ω) * (2V - 0.4V) = 12.8mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 32.6mW
FIGURE 2. LVHSTL DRIVER CIRCUIT AND TERMINATION
V
DDO
V
OUT
RL
50Ω
Q1


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