8T49N203A-006NLGI8

Overview

The Renesas 8T49N203A-006NLGI8 is a programmable clock generator from the FemtoClock NG series, designed for low phase jitter applications. It features a single PLL with differential input and output capabilities, supporting LVPECL and LVDS signal standards. The device operates on a 2.375V to 3.465V supply voltage within an ambient temperature range of -40°C to 85°C. Packaged in a 40-VFQFN exposed pad (6x6 mm) in tape and reel format, this component integrates I2C programming for flexible frequency configuration. The part is currently listed as obsolete by the manufacturer.

Feature Summary

• Fourth-generation FemtoClock NG PLL technology for low RMS phase jitter
• Supports differential inputs including LVPECL, LVDS, HCSL, and crystal oscillators
• Configurable LVPECL or LVDS outputs with bank selection
• I2C serial interface for register programming and custom frequency sets

Applications

• PCI Express Gen2 (5Gb/s) and Gen3 (8Gb/s) jitter compliant systems
• Networking and communications equipment requiring precise clock synthesis
• Servers and storage systems utilizing high-speed data interfaces

Procurement Notes

This component is officially discontinued and no longer manufactured by Renesas Electronics Corporation. Verification of availability should focus on surplus distributors or secondary market sources rather than direct OEM channels. Buyers must confirm the specific order code suffix matches their design requirements, as functional variations may exist between legacy stock lots. RoHS3 compliance is documented for existing inventory.

Selection Notes

Designers replacing this obsolete part should evaluate current FemtoClock NG alternatives such as the 8T49N241 series. Compatibility checks must include pinout alignment, package dimensions (40-VFQFN), and electrical specifications like supply voltage and output drive strength. Verify that the replacement supports the required input/output signal types (LVPECL/LVDS) and meets the target phase jitter performance for the specific application bandwidth.

Part Context

The 8T49N203A belongs to the IDT/Renesas FemtoClock NG family, known for integrating jitter attenuation and frequency translation in a single chip. This specific model variant was engineered for applications demanding strict timing accuracy with multiple output clocks derived from a single reference. The '006' suffix denotes a factory pre-programmed frequency set, which can be overwritten via I2C if needed.

Replacement Considerations

Publicly confirmed substitute part numbers include 8T49N241-994NLGI, 8T49N241-998NLGI, and 8T49N242-998NLGI8. These devices offer similar functionality but require verification of pin compatibility and software register mapping before integration.