ICS85222AM-01LF datasheet(9/13 Pages) ICST

Part #	ICS85222AM-01LF

Description	DUAL LVCMOS / LVTTL-TO DIFFERENTIAL

PDF	13 Pages

Scroll/Zoom	100%

Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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9 / 13 page

85222AM-01

www.icst.com/products/hiperclocks.html

REV. A NOVEMBER 15, 2005

Integrated

Circuit

Systems, Inc.

ICS85222-01

DUAL LVCMOS / LVTTL-TO-

DIFFERENTIAL HSTL TRANSLATOR

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 3.

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_M

) * (V

DD_MAX

- V

OH_M

)

Pd_L = (V

OL_MAX

) * (V

DD_MAX

- V

OL_MAX

)

Pd_H = (1.4V/50

Ω) * (3.465V - 1.4V) = 57.82mW

Pd_L = (0.4V/50

Ω) * (3.465V - 0.4V) = 24.52mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 82.34mW

FIGURE 3. HSTL DRIVER CIRCUIT AND TERMINATION

OUT

ICS85222AM-01LF Datasheet(PDF) 9 Page - Integrated Circuit Systems