ICS85211AMIT datasheet(8/12 Pages) ICST

Part #	ICS85211AMIT

Description	LOW SKEW, 1-TO-2 DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER

PDF	12 Pages

Scroll/Zoom	100%

Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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8 / 12 page

85211AMI

www.icst.com/products/hiperclocks.html

REV. B ARPIL 8, 2003

Integrated

Circuit

Systems, Inc.

ICS85211I

LOW SKEW, 1-TO-2

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 7.

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) = 54.36mW

Pd_L = (0.4V/50

Ω) * (3.465V - 0.4V) = 24.52mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 78.88mW

FIGURE 7. LVHSTL DRIVER CIRCUIT AND TERMINATION

OUT

Ω

ICS85211AMIT Datasheet(PDF) 8 Page - Integrated Circuit Systems