W137 Datasheet, PDF (1/8 Pages) Cypress Semiconductor – Bx Notebook System Frequency Synthesizer

W137
FTG for Mobile 440BX & Transmeta’s Crusoe CPU
Features
• Maximized EMI suppression using Cypress’s Spread
Spectrum Technology
• Two copies of CPU output
• Six copies of PCI output (Synchronous w/CPU output)
• One 48-MHz output for USB support
• One selectable 24 /48 MHz output
• Two Buffered copies of 14.318 MHz input reference
signal
• Supports 100 MHz or 66 MHz CPU operation
• Power management control input pins
• Available in 28-pin SSOP (209 mils) and 28-pin TSSO
(173 mils)
• SS function can be disabled
• See W40S11-02 for 2 SDRAM DIMM support
Key Specifications
Supply Voltages:........................................ V_DDQ3 = 3.3V±5%
V_DDQ2 = 2.5V±5%
CPU0:1 Output to Output Skew: ................................. 175 ps
CPU0:1 Cycle to Cycle Jitter: ..................................... 200 ps
PCI_F, PCI1:5 Output to Output Skew:....................... 500 ps
PCI_F, PCI1:5 Cycle to Cycle Jitter: .......................... 250 ps
CPU to PCI Output Skew:................1.5–4.0 ns (CPU Leads)
Output Duty Cycle:..................................................... 45/55%
PCI_F, PCI Edge Rate: .............................................. >1 V/ns
CPU_STOP#, OE, SPREAD#, SEL48#, PCI_STOP#,
PWR_DWN# all have a 250-kW pull-up resistor.
Table 1. Pin Selectable Frequency
SEL100/66# OE
CPU
PCI
0/1
0
Hi-Z
Hi-Z
0
1 66.6 MHz 33.3
1
1 100 MHz 33.3
Spread%
Don’t Care
See Table 2
See Table 2
Table 2. Spread Spectrum Feature
SPREAD#
0
1
Spread Profile
–0.5% (down spread)
0% (spread disabled)
Blo_<c_ak_djD_usia_{t t}g_hr_ea_sm_{ize of the anchored frame as}
per requirement>
Pin Configuration
Rev 1.0, November 24, 2006
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