841S01CGLF

Overview

The Renesas 841S01CGLF is a PLL-based clock generator designed for PCI Express applications. It generates a 100MHz HCSL differential output from a 25MHz reference input, which can be derived from an external source or an on-chip crystal oscillator. The device supports I2C configuration for spread spectrum operation to reduce EMI, with selectable down-spread values of -0.35% or -0.5%. Operating at 3.3V, it features low jitter performance with a maximum RMS period jitter of 3ps and cycle-to-cycle jitter of 35ps. It is housed in a 16-pin TSSOP package and operates within a 0°C to 70°C ambient temperature range.

Feature Summary

• Generates 100MHz HCSL differential clock from 25MHz reference
• I2C interface for spread spectrum control (-0.35% or -0.5%)
• Low jitter: 3ps RMS period, 35ps cycle-to-cycle
• Supports external reference or internal 25MHz crystal oscillator

Applications

• PCI Express clock generation
• Systems requiring low jitter clock distribution
• EMI reduction through spread spectrum clocking

Procurement Notes

Verify component status as the 841S01 series may be obsolete. Confirm package type (TSSOP) and suffix (CGLF) matches design requirements. Check for alternative sources if new production is unavailable. Ensure I2C address and spread spectrum settings align with system specifications.

Selection Notes

Select this component when a 100MHz HCSL output is required for PCI Express interfaces. Verify that the 25MHz input frequency matches the system reference. Consider the 0-70°C operating range for environmental compatibility. Compare jitter specifications against receiver requirements to ensure signal integrity.

Part Context

The 841S01 belongs to Renesas' family of PCI Express clock generators. It is part of the 841S series, which includes variants like the 841S01CGLFT. These devices are specialized for high-speed serial link clocking, providing precise frequency synthesis and jitter attenuation for compliant data transmission standards.

Replacement Considerations

Check for direct pin-compatible substitutes within the 841S series. Verify if newer generations offer improved jitter or power consumption. Confirm availability of equivalent clock generators from other manufacturers if the 841S01 is discontinued.