W48C101-01
Spread Spectrum BX System Frequency Generator
Features
• Maximized EMI suppression using Cypress’s Spread
Spectrum technology
• Four copies of CPU output
• Eight copies of PCI output (Synchronous w/CPU
output)
• Two copies of 14.318-MHz IOAPIC output
• Two copies of 48-MHz USB output
• Three buffered copies of 14.318-MHz reference input
• Input is a 14.318-MHz XTAL or reference signal
• Selectable 100-MHz or 66-MHz CPU outputs
• Power management control input pins
• Test mode and output three-state capability
CPU0:3 Jitter (Cycle to Cycle): ................................... 200 ps
CPU0:3 Clock Skew: .................................................. 175 ps
PCI_F, PCI1:7 Clock Skew: ........................................ 500 ps
CPU to PCI Clock Skew: ..............1.5 to 4.0 ns (CPU Leads)
Logic inputs have 250-k pull-up resistors except SEL100/66#.
Table 1. Pin Selectable Frequency
SEL
100/66#
0
0
0
0
1
1
1
1
SEL1
0
0
1
1
0
0
1
1
SEL0
0
1
0
1
0
1
0
1
CPU
PCI
(MHz) (MHz)
HI-Z
66.6
66.6
66.6
X1/2
100
100
100
HI-Z
33.3
33.3
33.3
X1/6
33.3
33.3
33.3
SPREAD#=0
Don’t Care
±0.9% Center
–1% Down
–0.5% Down
Don’t Care
±0.9% Center
–1% Down
–0.5% Down
Key Specifications
Supply Voltages:........................................V
DDQ3
= 3.3V±5%
...............................................................................................
V
DDQ2
= 2.5V±5% or 3.3V±5%
Rev 1.0, November 28, 2006
2200 Laurelwood Road, Santa Clara, CA 95054
Tel:(408) 855-0555
Fax:(408) 855-0550
Page 1 of 8
www.SpectraLinear.com
SPECTRALINEAR [ SPECTRALINEAR INC ]
