8T49N203A-030NLGI

Overview

The Renesas Electronics Corporation 8T49N203A-030NLGI is a FemtoClock NG Universal Frequency Translator and Synthesizer. It features two differential outputs programmable as LVPECL or LVDS, supporting frequencies from 0.98MHz to 1,300MHz. The device accepts differential inputs (LVPECL, LVDS, LVHSTL, HCSL) in the 8kHz–710MHz range or a crystal input (16MHz–40MHz). It includes alarm monitoring, I²C programming, and two factory-programmable power-up configurations stored in OTP memory. Operating voltage ranges from 2.5V to 3.3V, with an ambient temperature range of -40°C to 85°C.

Feature Summary

• Generates output frequencies from 0.98MHz to 1,300MHz using three modes: Frequency Synthesizer, High-Bandwidth Translator, and Low-Bandwidth Translator.
• Two individually programmable differential outputs selectable as LVPECL or LVDS with 2.5V or 3.3V levels.
• Supports two differential clock inputs (LVPECL, LVDS, LVHSTL, HCSL) and automatic/manual switching with hitless transition capabilities.
• Includes alarm outputs for holdover, lock status, and input/crystal bad conditions.

Applications

• Networking and communications line cards requiring jitter attenuation.
• PCI Express and computing applications utilizing high-bandwidth frequency translation.
• Systems requiring zero ppm frequency translation from disparate input sources.

Procurement Notes

Verify component authenticity through authorized distributors. Confirm RoHS compliance and package integrity upon receipt. Check for specific ordering suffixes that may indicate variations in packaging or testing standards. Ensure compatibility with existing I2C addressing configurations before deployment.

Selection Notes

Select this model when dual independent output clocks are required from a single PLL architecture. Verify that the desired output frequency falls within the supported divider ranges defined in Table 3. Ensure the input source matches one of the supported differential types or crystal frequencies. Confirm that the required output swing (2.5V or 3.3V) aligns with the VCCO supply requirements.

Part Context

This component belongs to the IDT8T49N203I FemtoClock NG family. It serves as a general-purpose low phase noise translator suitable for replacing older generation clock generators in high-speed digital systems. The device integrates alarm functions typically found in separate monitoring ICs, simplifying board design for synchronous Ethernet and SONET/SDH applications.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult manufacturer guidelines for end-of-life transitions or equivalent performance alternatives if this specific variant is discontinued.

FAQ

How many factory-programmed configurations does the device support?

The device supports two factory-programmed default power-up configurations stored in One-Time Programmable (OTP) memory, selectable via the CONFIG pin or register.

What is the maximum output frequency achievable?

The programmable output frequency range extends up to 1,300MHz, depending on the internal VCO operating frequency and output divider settings.

Can the device switch between input references automatically?

Yes, it supports automatic switching between CLK0 and CLK1 inputs in revertive or non-revertive modes, utilizing Phase Slope Limiting to control output phase transients during switchover.