ICS852911AVIT datasheet(11/15 Pages) ICST

Part #	ICS852911AVIT

Description	LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-HSTL FANOUT BUFFER

PDF	15 Pages

Scroll/Zoom	100%

Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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11 / 15 page

Integrated

Circuit

Systems, Inc.

ICS852911I

LOW SKEW, 1-TO-9

DIFFERENTIAL-TO-HSTL FANOUT BUFFER

852911AVI

www.icst.com/products/hiperclocks.html

REV. A MAY 23, 2005

3. Calculations and Equations.

The purpose of this section is to derive the power dissipated into the load.

HSTL output driver circuit and termination are shown in

Figure 5.

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

DDO_MAX

- V

OH_MAX

)

Pd_L = (V

OL_MAX

) * (V

DDO_MAX

- V

OL_MAX

)

Pd_H = (1.4V/50

Ω) * (3.6V - 1.4V) = 61.6mW

Pd_L = (0.4V/50

Ω) * (3.6V - 0.4V) = 25.6mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 87.2mW

FIGURE 5. HSTL DRIVER CIRCUIT AND TERMINATION

DDO

OUT

50Ω

ICS852911AVIT Datasheet(PDF) 11 Page - Integrated Circuit Systems