8T49N285A-999NLGI

Overview

The Renesas 8T49N285A-999NLGI is a FemtoClock NG Universal Frequency Translator (UFT) clock synthesizer and jitter cleaner. It supports input frequencies up to 875 MHz and generates output frequencies up to 1 GHz. The device features low jitter performance, compliant with GR.1244-CORE Stratum standards for telecommunications applications. It integrates an on-chip EEPROM for configuration storage and supports multiple differential and single-ended output types including LVDS, LVPECL, HCSL, and LVCMOS. The component operates within a temperature range of -40°C to +85°C and is housed in a 72-VFQFN package.

Feature Summary

• Universal Frequency Translation: Supports integer and fractional-N PLL synthesis with high flexibility for various input/output frequency combinations.
• Low Jitter Performance: Designed for ultra-low phase noise applications, meeting GR.1244-CORE Stratum specifications.
• Integrated Configuration Memory: Includes on-chip EEPROM for storing device settings, reducing external component requirements.
• Multi-Format Outputs: Provides flexible output interface options including LVDS, LVPECL, HCSL, and LVCMOS to suit diverse system needs.

Applications

• Telecommunications base stations requiring precise timing synchronization.
• High-speed data communication equipment needing low-jitter clock distribution.
• Network infrastructure adhering to GR.1244-CORE Stratum standards.
• Test and measurement instruments demanding stable frequency generation.

Procurement Notes

Verify the specific suffix '999' against official Renesas documentation to confirm exact factory programming and pin-to-pin compatibility. Check current lifecycle status as clock generator models may undergo discontinuation or revision. Confirm moisture sensitivity level (MSL) and reflow soldering profile requirements prior to assembly to ensure reliability during manufacturing processes.

Selection Notes

Select this model when GR.1244-CORE compliance is mandatory for the application. Ensure the required output voltage levels and drive strengths match the available LVDS, LVPECL, or HCSL options. Compare power consumption figures against system thermal constraints, as UFT devices can draw significant current at high output frequencies. Validate that the input frequency range covers the reference source provided by the system design.

Part Context

This part belongs to the Renesas FemtoClock NG family, specifically the 8T49N285A series designed for universal frequency translation. It serves as a successor or variant to earlier 8T49N28x models, offering enhanced programmability and lower jitter. The 8T49N285A series is widely used in carrier-grade networking equipment where timing integrity is critical for signal integrity and protocol compliance.

Replacement Considerations

Direct substitutes include other 8T49N285A variants with different suffixes if electrical parameters match. Cross-reference with 8T49N286 or 8T49N287 series for similar functionality, but verify pinout and register compatibility. Always consult the latest Renesas datasheet for approved replacement lists and engineering change notices.