May 2007
rev 0.3
PCS3P622S04J
Input-Output Skew
Test Circuit
Timing-Safe™
Output
Input
+3.3V
CLKOUT
OUTPUT
TSKEW
+
TSKEW
-
VDD
CLOAD
0.1uF
GND
One clock cycle
N=1
T
SKEW represents input-output skew
when spread spectrum is ON
For example, TSKEW = ± 0.375 for an
Input clock16MHz, translates in to
(1/16MHz) * 0.375=23.43nS
A Typical example of Timing-Safe™ waveform
Input
Input
CLKOUT with SSOFF
Timing-Safe™ CLKOUT
Low Frequency Timing-Safe™ Peak EMI Reduction IC
6 of 10
Notice: The information in this document is subject to change without notice.