W254B Datasheet, PDF (14/17 Pages) SpectraLinear Inc – 133MHz Spread Spectrum FTG for Mobile Pentium® III Platforms

W254B
Group Skew and Jitter Limits
Output Group
CPU
SDRAM
APIC
48MHz
3V66
PCI
REF
VCH_CLK
Pin-Pin Skew Max.
150 ps
250 ps
250 ps
N/A
175 ps
500 ps
N/A
N/A
Cycle-Cycle Jitter
250 ps
250 ps
500 ps
500 ps
500 ps
500 ps
1000 ps
250 ps
Duty Cycle
45/55
45/55
45/55
45/55
45/55
45/55
45/55
45/55
Nom Vdd
2.5V
3.3V
2.5V
3.3V
3.3V
3.3V
3.3V
3.3V
Skew, Jitter
Measure Point
1.25V
1.5V
1.25V
1.5V
1.5V
1.5V
1.5V
1.5V
Output
Buffer
Test Point
Clock Output Wave
2.0
1.25
2.5V Clocking
Interface
0.4
T_HIGH
Test Load
T_PERIOD
Duty Cycle
T_RISE
T_FALL
T_LOW
T_HIGH
T_PERIOD
Duty Cycle
2.4
3.3V Clocking ^1.5
Interface ^0.4
T_RISE
T_FALL
T_LOW
Figure 10. Output Buffer
Ordering Information
Ordering Code
W254B
Package Name
X
Package Type
48-pin TSSOP (6.1 mm)
Document #: 38-07233 Rev. *A
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