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E
It is expected that the larger the overshoot α, the
smaller the amount of time, τ, needed to maintain
setup time to within +0.05 ns of the nominal value.
For a given value of α, it is likely that τ will be the
longest for the slowest input edge rate of 0.3 V/ns.
V
+ 0.2
R EF
V
R EF
− 0.2
V
R EF
V
start
Figure 24. Standard Input Lo-to-Hi Waveform for Characterizing Receiver Ringback Tolerance
PENTIUM® PRO PROCESSOR AT 150, 166, 180, and 200 MHz
Furthermore, there may be some dependence
between τ and lower starting voltages than V
0.2 V (for Lo-to-Hi transitions) for the reason
described later in Section 4.2.3.2. Minimum Set-up
and Hold Times.
τ
10 ps rise/fall E dges
α
ρ
δ
T
+0.05ns
su
1.5 V C lk R ef
φ
Clock
REF –
T im e
41
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