840NT4NLGI

Clock Generators, PLLs, Frequency Synthesizers Overview

The 840NT4NLGI is a PLL-based clock generator designed for Freescale B4/T4 Processor systems. It provides ten LVCMOS outputs, including four system clocks, four DDR clocks, one RTC output, and one 25MHz reference clock. The device supports selectable input references via crystal oscillator or differential LVPECL interfaces. Operating frequencies range from 25MHz to 200MHz with VCO operation between 2GHz and 2.4GHz. Key features include frequency margining in less than 0.312MHz steps and spread spectrum clocking for EMI reduction. Core and output voltages are independently selectable across multiple levels.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Ten LVCMOS clock outputs: four system, four DDR, one RTC, and one 25MHz reference
• Selectable input reference: crystal oscillator interface or differential LVPECL input
• Frequency margining capability in < 0.312MHz steps
• Spread spectrum clocking for EMI reduction

Clock Generators, PLLs, Frequency Synthesizers Applications

• Freescale B4/T4 Processor systems
• System clock generation
• DDR clock distribution
• Real-time clock (RTC) output
• EMI-sensitive digital designs

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify RoHS compliance status and current availability as the component may be subject to end-of-life notices. Confirm package type and pinout compatibility during procurement. Check for any specific ordering suffix requirements that might affect electrical characteristics or packaging format.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Ensure supply voltage requirements match the target application's core and output voltage needs. Verify input signal compatibility with available crystal oscillators or LVPECL sources. Consider thermal management requirements based on operating temperature range of -40°C to 85°C.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to Renesas' portfolio of programmable clock generators tailored for high-performance processor applications. It addresses the timing requirements of complex system-on-chip architectures by providing precise, low-jitter clock signals with flexible configuration options.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Consult official replacement guides for compatible alternatives within the FemtoClock NG family. Verify functional equivalence regarding output count, voltage levels, and jitter specifications before substitution.