8T49N008A-000NLGI

Overview

The 8T49N008A-000NLGI is a programmable clock generator from the FemtoClock NG family, manufactured by Renesas Electronics. It features an LVPECL/LVDS 8-output architecture designed for high-performance timing applications. The device supports output frequencies up to 1 GHz (differential) and 250 MHz (LVCMOS), with jitter performance meeting limits for 10G to 25G Ethernet applications. It includes a fractional-feedback PLL for frequency translation or synthesis, register programming via I2C, and hitless switching capabilities. The component operates within a -40°C to +85°C temperature range.

Feature Summary

• Generates up to 8 independent output clocks ranging from 8 kHz to 1 GHz (diff.) or 250 MHz (LVCMOS).
• Supports LVPECL, LVDS, HCSL, and LVCMOS output levels with low jitter performance suitable for 10G–25G Ethernet.
• Features one fractional-feedback PLL and four integer output dividers for flexible frequency synthesis.
• Enables auto/manual input clock selection with hitless switching and phase-slope limiting.

Applications

• 10G/40G/100G SONET/SDH and Ethernet network line cards.
• Wireless base station baseband units.
• Carrier Ethernet switches and OTN equipment.
• Test and measurement applications requiring precise timing.

Procurement Notes

Verify component status as the related 8T49N008A-062NLGI variant is marked End-of-Life. Confirm availability through authorized distributors and check for Product Change Notices regarding assembly site or marking changes. Ensure compliance with RoHS3 specifications and moisture sensitivity level 1 requirements during handling.

Selection Notes

Select this model when eight differential or single-ended outputs are required for high-speed serial links. Verify that the input clock source matches the supported range of 8 kHz to 875 MHz. Consider the I2C programmability and EEPROM boot options if configuration persistence is needed. Ensure the application environment stays within the specified operating temperature range.

Part Context

This part belongs to the 8T49N008 series of FemtoClock NG devices. It shares architectural similarities with other models in the 8T49N2xx family but offers specific output counts and pin configurations tailored for compact high-density timing solutions. It is often used alongside Synchronous Equipment Timing Sources (SETS) to maintain G.8262 compliance.

Replacement Considerations

Check for direct substitutes such as the 8T49N242 series, which offers similar functionality with different output configurations. Verify pin-to-pin compatibility and register map alignment before substitution. Consult Renesas documentation for any functional differences in jitter performance or power supply requirements.