ICS85222 datasheet(8/12 Pages) ICST

부품명	ICS85222

상세설명	DUAL LVCMOS / LVTTL-TO DIFFERENTIAL LVHSTL TRANSLATOR

PDF	12 Pages

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제조업체	ICST [Integrated Circuit Systems]

홈페이지	http://www.icst.com

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8 / 12 page

85222AM

www.icst.com/products/hiperclocks.html

REV. B MARCH 31, 2005

Integrated

Circuit

Systems, Inc.

ICS85222

DUAL LVCMOS / LVTTL-TO-

DIFFERENTIAL LVHSTL TRANSLATOR

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 50

Ω 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_MAX

) * (V

DD_MAX

- V

OH_MAX

)

Pd_L = (V

OL_MAX

) * (V

DD_MAX

- V

OL_MAX

)

Pd_H = (1.2V/50

Ω) * (3.465V - 1.2V) = 54.4mW

Pd_L = (0.4V/50

Ω) * (3.465V - 0.4V) = 24.52mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 78.9mW

FIGURE 2. LVHSTL DRIVER CIRCUIT AND TERMINATION

OUT

ICS85222 데이터시트(PDF) 8 Page - Integrated Circuit Systems