8T49N028-010NLGI

Overview

The 8T49N028-010NLGI is a low RMS phase jitter clock synthesizer manufactured by Renesas Electronics. It utilizes fourth-generation FemtoClock NG PLL technology and features eight selectable LVPECL or LVDS outputs, with bank selectability and two output channels per bank. The device accepts differential input levels including LVPECL, LVDS, and HCSL on the CLK and nCLK input pair. It supports full 2.5V or 3.3V power supplies and includes an I2C programming interface. The internal VCO range operates from 1.92GHz to 2.5GHz. Output frequencies are mux selectable from the internal crystal oscillator, reference clock input, or output dividers A and B.

Feature Summary

• Fourth-generation FemtoClock NG PLL technology
• Eight selectable LVPECL or LVDS outputs (bank selectable)
• RMS phase jitter at 156.25MHz: 225fs (typical) from Divider A, 219fs (typical) from Divider B (12KHz to 20MHz)
• PCI Express Gen2 (5Gb/s) and Gen3 (8Gb/s) jitter compliant

Applications

• PCI Express (2.5Gb/s, 5Gb/s, 8Gb/s) systems
• High-speed digital interfaces requiring low jitter
• General purpose clock generation for networking equipment

Procurement Notes

Verify component status as the 8T49N028 family may have end-of-life notifications. Confirm package type and ordering suffixes against current Renesas documentation. Check for RoHS compliance status and moisture sensitivity level requirements during storage and handling.

Selection Notes

Select this component when eight differential outputs are required with specific jitter performance for PCIe Gen2/Gen3 applications. Ensure supply voltage matches either 2.5V or 3.3V requirements. Verify that the input clock format (LVPECL, LVDS, HCSL) is compatible with the system design.

Part Context

The 8T49N028 belongs to the FemtoClock NG series of clock generators. It is designed for applications requiring precise timing and low phase noise. The device allows configuration via I2C or factory pre-programming based on frequency select pins.

Replacement Considerations

Consult Renesas official substitution guides for equivalent FemtoClock devices. Verify pin compatibility and electrical specifications before replacing.