844201BKI-45LF

Specialized ICS Overview

The Renesas Electronics ICS844201BKI-45 is a FemtoClock crystal-to-LVDS clock generator designed for PCI Express applications. It synthesizes 100MHz or 125MHz reference clocks from a 25MHz parallel resonant crystal input using an internal VCO operating between 490MHz and 680MHz. The device provides one differential LVDS output pair with typical RMS phase jitter of 0.792ps at 100MHz and 0.773ps at 125MHz (12kHz–20MHz). Operating on a single 3.3V supply, it meets PCI Express Gen 1 and Gen 2 jitter compliance standards in a compact 16-VFQFN package.

Specialized ICS Feature Summary

• Synthesizes 100MHz or 125MHz outputs from a 25MHz crystal input
• Low RMS phase jitter: 0.792ps (100MHz) and 0.773ps (125MHz)
• Compliant with PCI Express Gen 1 (2.5Gb/s) and Gen 2 (5Gb/s) jitter requirements
• Single 3.3V power supply operation with -40°C to 85°C ambient temperature range

Specialized ICS Applications

• PCI Express Gen 1 and Gen 2 systems requiring low-jitter reference clocks
• Systems utilizing the Common Clock Architecture for PCIe links
• Space-constrained designs due to small 16-pin VFQFN footprint

Specialized ICS Procurement Notes

Verify the manufacturer designation as Integrated Device Technology (IDT), which was acquired by Renesas Electronics. Confirm the specific ordering suffix (LF for lead-free tube packaging) matches the required delivery format. Ensure the component is sourced from authorized distributors to guarantee authenticity and traceability for industrial specifications.

Specialized ICS Selection Notes

Select this component when a fixed-frequency crystal-to-LVDS generator is required for PCI Express interfaces. It is suitable for designs needing 100MHz or 125MHz outputs with strict jitter budgets. Verify that the system can accommodate the 25MHz crystal interface and that the 3.3V supply voltage aligns with the target platform's power rails.

Specialized ICS Part Context

This part belongs to the IDT FemtoClock family of clock generators, specifically optimized for high-speed serial link applications like PCI Express. Following Renesas' acquisition of IDT, these timing solutions are integrated into the broader Renesas portfolio, maintaining the original performance characteristics and pinouts defined in the legacy datasheets.

Specialized ICS Replacement Considerations

The ICS844201I-45 serves as the base model for this variant. For tape and reel packaging options, consider the 844201BKI-45LFT. No direct cross-manufacturer substitutes are documented in the provided source material.