IDT5T929-10NLGI

Overview

The IDT5T929-10NLGI is a precision clock generator designed for OC-48 SONET/SDH and Gigabit Ethernet applications. It generates high-precision source clocks with LVDS outputs, supporting input frequencies from 19.44 MHz to 666.52 MHz. The device features hitless switchover between primary (CLKIN) and backup (REFIN) inputs, ensuring continuous operation during signal loss. It operates within a 2.375 V to 3.465 V supply range and supports an industrial temperature range of -40°C to +85°C in a 28-pin VFQFPN package.

Feature Summary

• Hitless switchover mechanism allows seamless transition between CLKIN and REFIN inputs without output glitches.
• Supports multiple input standards including differential LVPECL, LVDS, and single-ended LVTTL.
• Provides regenerated clock output (QREG) and multiplied output (QOUT) with selectable frequency ranges via SELmode pin.
• Includes lock indicator output and power-down mode for system management.

Applications

• SONET/SDH systems requiring OC-48 precision timing
• Gigabit Ethernet infrastructure equipment
• Terabit routers and digital cross-connects
• Optical transceiver modules

Procurement Notes

This component has been discontinued by the manufacturer. The last time buy period expired on October 28, 2014. Verification of current availability requires checking authorized distributors for remaining stock or obsolete inventory channels. Ensure compliance with end-of-life procurement policies before initiating orders.

Selection Notes

Select the IDT5T929-10NLGI specifically for LVDS output requirements; the -30 variant provides LVPECL outputs. Verify that the application requires the specific frequency multiplication ratios supported by this fixed-function generator. Confirm that the 2.375V–3.465V supply voltage aligns with the system design. Note that configuration is hardware-based via the SELmode pin rather than programmable via I2C.

Part Context

The IDT5T929 belongs to the IDT precision clock generator family targeted at telecommunications and networking timing solutions. Originally manufactured by Integrated Device Technology (IDT), the brand was acquired by Renesas Electronics Corporation. This specific part represents a legacy solution for SONET/SDH OC-48 applications prior to the integration into broader Renesas timing portfolios.

Replacement Considerations

The datasheet explicitly identifies the 8T49N222B-dddNLGI as a replacement part. Users should verify electrical compatibility and pinout alignment when transitioning from this discontinued fixed-function generator to the newer programmable alternative.