CY28317PVXC-2

Application Specific Clock/Timing Overview

The CY28317PVXC-2 is a single-chip system frequency synthesizer designed for mobile VIA PL133T and PLE133T chipsets. It generates programmable CPU, PCI, and SDRAM clock outputs with less than 1 MHz increment resolution. The device integrates an SMBus interface for configuration, a fail-safe Watchdog Timer for system recovery, and Spread Spectrum technology to maximize EMI suppression. Key electrical specifications include a CPU-to-CPU output skew of 175 ps and a PCI-to-PCI output skew of 500 ps. It operates with 3.3V supplies for core logic and 2.5V for CPU outputs, housed in a 48-pin SSOP or TSSOP package.

Application Specific Clock/Timing Feature Summary

• Single-chip system frequency synthesizer for mobile VIA PL133T and PLE133T chipsets
• Programmable clock output frequency with less than 1 MHz increment
• Integrated fail-safe Watchdog Timer for system recovery
• Automatic switch to HW-selected or SW-programmed clock frequency when Watchdog Timer time-out occurs
• System RESET generation capability after a Watchdog Timer time-out occurs or a change in output frequency via SMBus interface
• Support SMBus byte Read/Write and block Read/Write operations to simplify system BIOS development
• Vendor ID and Revision ID support
• Programmable drive strength for SDRAM and PCI output clocks
• Programmable output skew for CPU, PCI and SDRAM
• Maximized EMI Suppression using Cypress’s Spread Spectrum technology
• Available in 48-pin SSOP and TSSOP packages

Application Specific Clock/Timing Applications

• Mobile VIA PL133T chipset platforms
• Mobile VIA PLE133T chipset platforms

Application Specific Clock/Timing Procurement Notes

Verify the component matches the exact part number CY28317PVXC-2. Confirm the package type is either 48-pin SSOP or TSSOP as specified. Ensure the device is from a recognized manufacturer such as Cypress Semiconductor or Silabs, as indicated in the documentation. Check for any specific revision markings that might affect compatibility with the target motherboard design.

Application Specific Clock/Timing Selection Notes

Select this component when designing systems based on VIA PL133T or PLE133T chipsets requiring precise clock synchronization. Consider the programmable output skew features if tight timing margins are necessary between CPU, PCI, and SDRAM clocks. The integrated Watchdog Timer and automatic recovery mechanisms make it suitable for applications requiring high system reliability and fault tolerance.

Application Specific Clock/Timing Part Context

The CY28317 series is part of a family of clock generators developed by Cypress Semiconductor, now part of Silicon Labs. These devices are specifically tailored for mobile computing platforms, providing the necessary clock signals for processors, memory, and peripheral interfaces. The CY28317PVXC-2 variant offers enhanced features like programmable drive strength and detailed skew control to meet the stringent requirements of modern mobile architectures.

Application Specific Clock/Timing Replacement Considerations

Direct replacements may include other CY28317 variants with different package options or speed grades. Verify pin compatibility and register settings when substituting. Cross-reference with similar clock generators from other manufacturers only if functional equivalence can be confirmed through detailed datasheet comparison.

Application Specific Clock/Timing FAQ

What is the maximum CPU output frequency supported by the CY28317PVXC-2?

The CY28317PVXC-2 supports programmable CPU frequencies ranging from 50 MHz to 248 MHz.

How does the Watchdog Timer function in the CY28317PVXC-2?

The Watchdog Timer monitors system stability. If a time-out occurs, it generates a system reset and switches the clock outputs to a pre-configured recovery frequency to restore system operation.

Can the output drive strength be adjusted on the CY28317PVXC-2?

Yes, the drive strength for SDRAM, PCI, and CPU outputs can be programmed via the SMBus interface to optimize signal integrity and power consumption.