8T49N105A-003NLGI

Overview

The Renesas Electronics 8T49N105A-003NLGI is a FemtoClock NG Universal Frequency Translator and Synthesizer. It generates output frequencies from 0.98MHz to 1,300MHz using an input reference range of 8kHz to 710MHz or a crystal source of 16MHz to 40MHz. The device features a single differential output pair (Q, nQ) programmable as LVDS or LVPECL. It supports three operating modes: Frequency Synthesizer, High-Bandwidth Frequency Translator, and Low-Bandwidth Frequency Translator. Key electrical parameters include RMS phase jitter of 439fs at 155.52MHz (Low Bandwidth Mode) and 285fs at 400MHz (Synthesizer Mode). Power supplies operate at 3.3V or 2.5V with an ambient temperature range of -40°C to 85°C.

Feature Summary

• Universal Frequency Translator / Synthesizer with zero ppm frequency translation capability
• Single differential output (Q, nQ) configurable as LVDS or LVPECL
• Three operating modes: Frequency Synthesizer, High-Bandwidth Translator, Low-Bandwidth Translator
• Two factory-programmed default power-up configurations stored in OTP memory

Applications

• Networking and communications applications requiring low phase noise
• PCI Express and computing systems utilizing high-bandwidth frequency translation
• Line cards supporting multiple I/O modules with different clock requirements

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type, lead-free status, and revision level. Confirm that the device meets all RoHS compliance requirements for the intended application environment. Check for any product change notices or end-of-life notifications associated with this part number before finalizing procurement plans.

Selection Notes

Select this component when a flexible frequency translator is needed with support for both integer and fractional feedback division. Ensure the design accommodates the required input frequency range up to 710MHz or crystal inputs between 16MHz and 40MHz. Consider the available operating modes; use Low-Bandwidth mode for jitter attenuation or High-Bandwidth mode for tracking spread-spectrum modulation. Verify that the I2C interface can be utilized if dynamic reconfiguration after power-up is required.

Part Context

This device belongs to the IDT8T49N105I series within the FemtoClock NG family. It is manufactured by Integrated Device Technology, Inc., which has since become part of Renesas Electronics Corporation. The part is designed as a general-purpose clock generator suitable for demanding networking and communications environments requiring precise frequency synthesis and translation.

Replacement Considerations

Consult official Renesas documentation for confirmed substitute part numbers. Cross-reference pinouts and electrical specifications carefully when evaluating alternatives from other manufacturers to ensure compatibility with existing designs.