Cypress Semiconductor W149
This output is not affected by the PCI_STOP# input. When brought HIGH, all clock outputs activate.| Part No. | W149 |
|---|---|
| Datasheet | W149 Download |
| Manufacturer |  Cypress Semiconductor |
| Description | 440BX AGPset Spread Spectrum Frequency Synthesizer |
| Buy | Stock & Price |
FEATURES
● Maximized EMI suppression using Cypress’s Spread Spectrum Technology● Single chip system frequency synthesizer for Intel® 440BX AGPset
● Two copies of CPU output
● Six copies of PCI output
● One 48-MHz output for USB
● One 24-MHz output for SIO
● Two buffered reference outputs
● One IOAPIC output
● Thirteen SDRAM outputs provide support for 3 DIMMs
● Spread Spectrum feature always enabled
● I2C™ interface for programming
● Power management control inputs
● Smooth CPU frequency switching from 66.8–124 MHz VDDQ3: ..................................................................... 3.3V±5% VDDQ2: ..................................................................... 2.5V±5% SDRAMIN to SDRAM0:12 Delay:.......................... 3.7 ns typ. Table 1. Mode Input Table[1] Mode 0 1 Table 2. Pin Selectable Frequency Input Address FS2 1 1 1 1 0 0 0 0 FS1 1 1 0 0 1 1 0 0 FS0 1 0 1 0 1 0 1 0 [2] Pin 2 PCI_STOP# REF0 CPU0:1 (MHz) 100 100 103 66.8 83.3 66.8 124 PCI_F, 1:5 (MHz) 33.3 (CPU/...
