8T49N240-036NLGI

Overview

The 8T49N240-036NLGI is a FemtoClock NG Universal Frequency Translator manufactured by Renesas Electronics. It integrates a single fractional-feedback PLL capable of jitter attenuation or frequency synthesis, supported by four integer output dividers to generate up to four independent output frequencies ranging from 8 kHz to 1 GHz. The device accepts differential inputs such as LVPECL, LVDS, HCSL, and LVCMOS, with support for hitless switching and clock monitoring. Configuration is managed via an I²C interface or external EEPROM, utilizing OTP memory for boot-up states.

Feature Summary

• Single fractional-feedback PLL with four integer output dividers generating up to four independent frequencies (8 kHz to 1 GHz).
• Configurable differential outputs including LVPECL, LVDS, and HCSL; supports dual inputs with hitless switching.
• Low phase jitter performance typically below 200 fs (12 kHz to 20 MHz) for system design margin.
• Register programmable via I²C interface with OTP memory for power-up configuration.

Applications

• 10 Gbps, 40 Gbps, and 100 Gbps SONET/SDH network line cards.
• Carrier Ethernet switches requiring Synchronous Ethernet compliance.
• Wireless base station baseband units.
• OTU2 and OTU3 OTN multiplexers.

Procurement Notes

Verify the specific suffix '036' against official Renesas documentation to confirm factory pre-programmed input/output frequency configurations. Confirm current production status and lead times directly with authorized distributors, as availability may vary. Ensure compatibility with required supply voltages and operating temperature ranges (-40 °C to +85 °C) before procurement.

Selection Notes

Select this component when designing systems requiring flexible frequency translation from diverse input references to high-speed differential outputs. Verify that the required output frequencies fall within the 8 kHz to 1 GHz range and that the package size (typically 40-VFQFN) fits the PCB layout constraints. Ensure the application benefits from the low jitter performance relative to PHY requirements.

Part Context

This part belongs to the 8T49N240 family of FemtoClock NG Universal Frequency Translators. It shares core architecture with variants like the 8T49N241 and 8T49N242 but differs in specific factory-programmed configurations and pinout options defined by the order code suffix. The family is designed for high-performance networking and telecommunications timing applications.

Replacement Considerations

Direct replacements include other 8T49N24x series devices such as the 8T49N241 or 8T49N242, provided the specific frequency configurations match the design requirements. Verify pin-to-pin compatibility and register settings before substitution.