8T49N105ANLGI

Overview

The IDT8T49N105I is a FemtoClock NG Universal Frequency Translator and Synthesizer designed for networking and communications applications. It generates output frequencies from 0.98MHz to 1300MHz using an input range of 8kHz to 710MHz or a 16MHz-40MHz crystal. The device features three operating modes: Frequency Synthesizer, High-Bandwidth Frequency Translator, and Low-Bandwidth Frequency Translator. It provides a single differential output pair (Q, nQ) programmable as LVPECL or LVDS. Key electrical parameters include a core supply voltage of 2.5V or 3.3V, an analog supply of 3.3V, and an output supply of 2.5V or 3.3V. It operates within a temperature range of -40°C to 85°C.

Feature Summary

• Supports three operating modes: Frequency Synthesizer, High-Bandwidth Frequency Translator, and Low-Bandwidth Frequency Translator.
• Generates output frequencies from 0.98MHz to 1300MHz with zero ppm frequency translation capability.
• Features two factory-programmed default power-up configurations stored in OTP memory, selectable via CONFIG pin or I2C register.
• Includes alarm monitoring outputs for LOCK_IND, HOLDOVER, CLK_BAD, and XTAL_BAD conditions.

Applications

• Networking and communications line cards
• PCI Express and computing systems
• General purpose clock translation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and lead-free status. Confirm that the required factory-programmed configurations are specified during the ordering process, as these are burned into One-Time Programmable memory. Ensure compatibility with the intended I2C address settings defined by S_A0 and S_A1 pins.

Selection Notes

Select this component when a flexible universal frequency translator is required for networking or computing applications. Choose between LVPECL or LVDS output types based on downstream receiver requirements. Consider the Low-Bandwidth mode for jitter attenuation applications requiring an external crystal, or High-Bandwidth mode for tracking spread-spectrum modulation. Verify that the desired output frequency falls within the supported ranges for the selected output divider setting.

Part Context

The IDT8T49N105I belongs to the FemtoClock NG family of low phase noise clock generators. It is manufactured by Integrated Device Technology, which was acquired by Renesas Electronics. The device serves as a general-purpose solution for generating precise clock signals from various input sources, including fundamental mode crystals and high-frequency differential clocks.

Replacement Considerations

Consult the manufacturer's cross-reference guide for verified substitute part numbers. Ensure any replacement supports the same output frequency range, input types, and package dimensions. Verify that the replacement device offers compatible I2C programming interfaces and alarm output functionalities if system integration requires these features.

FAQ

How many factory-programmed configurations does the IDT8T49N105I support?

The device supports two factory-programmed default power-up configurations stored in One-Time Programmable (OTP) memory. These can be selected via the CONFIG pin or I2C register.

What are the supported output voltage levels for the Q and nQ pins?

The output type is programmable as either LVPECL or LVDS. The output supply voltage (VCCO) can be set to 2.5V or 3.3V, depending on the configuration.

Can the device attenuate jitter from the input reference?

Yes, in Low-Bandwidth Frequency Translator mode, the device uses an external crystal and a low PLL loop bandwidth (10Hz - 580Hz) to provide significant jitter attenuation. High-Bandwidth mode tracks input changes and does not attenuate much jitter.