85222AM-01LF datasheet(9/14 Pages) IDT

Part #	85222AM-01LF

Description	Dual LVCMOS / LVTTL-to-Differential HSTL Translator

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Manufacturer	IDT [Integrated Device Technology]

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REVISION A 5/7/15

85222-01 DATA SHEET

9

DUAL LVCMOS / LVTTL-TODIFFERENTIAL

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_MAX /RL) * (VDD_MAX - VOH_MAX)

Pd_L = (V

OL_MAX /RL) * (VDD_MAX - VOL_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

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