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HyperLynx – High Speed PCB Design Workshop - RTP Designers ...

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� Why Derating?<br />

DDR2 Timing Characteristics<br />

— Consider the area under the curve <strong>–</strong> Charge Model concept<br />

Vih AC<br />

Vref<br />

+ Δt - Δt<br />

2 V/ns<br />

1 V/ns<br />

0.5 V/ns<br />

<strong>HyperLynx</strong> <strong>–</strong> <strong>High</strong> <strong>Speed</strong> <strong>PCB</strong> <strong>Design</strong> <strong>Workshop</strong><br />

27

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