954119DFLFT

Application Specific Clock/Timing Overview

The ICS954119DFLFT is a clock synthesizer compliant with the Intel CK410 specification, designed for next-generation P4 processors. It provides multiple output pairs including two 0.7V current-mode differential CPU clocks, one SRC pair, five PCI-Express pairs, six standard PCI outputs, and dedicated USB and DOT clocks. The device operates from a 14.318MHz external crystal and supports programmable frequencies via an SMBus interface. Key electrical specifications include cycle-cycle jitter of less than 85ps for CPU/SRC outputs and less than 250ps for PCI outputs, with frequency accuracy of +/- 300ppm on critical processor clocks.

Application Specific Clock/Timing Feature Summary

• Supports Intel CK410 compliant clock generation for P4 processors
• Provides 0.7V current-mode differential outputs for CPU, SRC, and PCI-Express interfaces
• Features programmable spread spectrum modulation (0 to -0.5% down, ±0.25% or ±0.3% center) for EMI control
• Includes a watchdog timer and safe frequency programming capabilities

Application Specific Clock/Timing Applications

• Clock generation for Intel P4 processors and chipsets
• Serial-ATA (S-ATA) timing support requiring tight ppm accuracy
• PCI-Express system clock distribution
• USB 48MHz and display output timing generation

Application Specific Clock/Timing Procurement Notes

Verify that the component matches the ICS954119 series specifications, specifically the 56-pin SSOP package and 3.3V supply requirements. Confirm the presence of necessary external components such as the 14.318MHz crystal and load capacitors, as these are required for frequency tuning and proper operation. Ensure the source documentation aligns with the advance information dated May 24, 2004.

Application Specific Clock/Timing Selection Notes

Select this component when designing systems requiring CK410 compliance for Intel P4 platforms. It is suitable for applications needing precise jitter performance (<85ps for CPU) and flexible frequency configuration via SMBus. Consider the need for external resistors for voltage biasing on current-mode outputs and the requirement for a 475 ohm reference resistor on the IREF pin.

Application Specific Clock/Timing Part Context

The ICS954119 is part of the Integrated Circuit Systems, Inc. (ICS) family of clock synthesizers. It serves as a single-chip solution for generating the complex clock tree required by next-generation P4 processors and associated chipsets, replacing multiple discrete oscillators and buffers.

Application Specific Clock/Timing Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.