ICS8523I-03 데이터 시트보기 (PDF) - Integrated Circuit Systems

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ICS8523I-03

LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS8523I-03

LOW SKEW, 1-TO-4

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 5.

VDDO

Q1

VOUT

RL

50Ω

FIGURE 5. LVHSTL DRIVER CIRCUIT AND TERMINATION

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

/R ) * (V

-V )

OH_MAX L

DDO_MAX OH_MAX

Pd_L = (V /R ) * (V

-V )

OL_MAX L

DDO_MAX OL_MAX

Pd_H = (1V/50Ω) * (2V - 1V) = 20mW

Pd_L = (0.4V/50Ω) * (2V - 0.4V) = 12.8mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 32.8mW

8523AGI-03

www.icst.com/products/hiperclocks.html

11

REV. A OCTOBER 5, 2004

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