May 2007
rev 0.2
Input-Output Skew
Timing-Safe™
Output
PCS5P23Z05B/09B
Test Circuit
Input
+3.3V
TEST CIRCUIT
V
DD
T
SKEW
-
T
SKEW
+
+3.3V
0.1uF
CLKOUT
OUTPUTS
V
DD
LOAD
One clock cycle
N=1
when spread spectrum is ON
For example,
T
SKEW
= ± 0.125 for an
Input clock 32MHz, translates in to
(1/32MHz) * 0.125=3.90nS
0.1uF
T
SKEW
represents input-output skew
GND
GND
A Typical example of Timing-Safe™ waveform
Input
Input
CLKOUT with SSOFF
Timing-Safe™ CLKOUT
Timing-Safe™ Peak EMI Reduction IC
Notice: The information in this document is subject to change without notice.
7 of 14