W83195BG-118

Application Specific Clock/Timing Overview

The W83195BG-118 is a clock synthesizer designed for Intel P4 processors and Grandsdale chipsets. It provides step-less frequency programming with 32 selectable frequencies for CPU, PCI, and PCI-Express clocks. The device generates differential outputs including two pairs of 0.7V CPU clocks, one pair of 100MHz SRC clocks, one pair of 96MHz DOT clocks, five pairs of 0.7V PCI-Express clocks, six 3.3V PCI clocks, and fixed frequency outputs for USB and reference. It operates on a 3.3V supply (3.135V to 3.465V) and accepts a 14.318 MHz crystal input. The component supports I2C control, spread spectrum modulation, and includes a watchdog timer.

Application Specific Clock/Timing Feature Summary

• Step-less frequency programming via I2C or hardware latched pins
• Differential 0.7V current mode outputs for CPU, PCI-Express, SRC, and DOT
• -0.5% down-type spread spectrum capability for EMI reduction
• Integrated watchdog timer with automatic system reset output

Application Specific Clock/Timing Applications

• Intel P4 processor systems
• Intel Grandsdale chipset platforms
• SATA controller clock generation (SRC)
• Integrated graphics chipset clock generation (DOT)

Application Specific Clock/Timing Procurement Notes

Verify the specific suffix 'BG' corresponds to the Pb-free 56-SSOP package variant as documented in the datasheet revision history. Confirm that the design requires the 3.3V operating voltage range and 14.318 MHz crystal reference specified in the general description. Ensure the application utilizes the I2C interface address 0xD2 for register configuration.

Application Specific Clock/Timing Selection Notes

Select this component when designing for Intel 915/945 chipset architectures requiring precise CPU and PCIe clock synchronization. The device supports up to 400 MHz CPU frequencies and 100 MHz SRC/DOT outputs. Consider the 56-pin SSOP package constraints and the requirement for an external precision resistor at the IREF pin to set differential drive currents.

Application Specific Clock/Timing Part Context

This part belongs to the Winbond W83195 series of clock generators. The 'BG' suffix typically denotes the Pb-free version in the 56-SSOP package, while 'BR' may indicate other packaging options within the same functional family. The datasheet revision 0.81 indicates updates to register defaults and spread spectrum control bits compared to earlier versions.

Application Specific Clock/Timing Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical specifications if considering alternative clock synthesizers from different manufacturers.