843081AGI-01LF

Clock Generators, PLLs, Frequency Synthesizers Overview

The Renesas Electronics Corporation 843081AGI-01LF is an Ethernet Clock Multiplier designed to accept a crystal reference frequency between 19.6MHz and 28MHz. It generates differential LVPECL outputs in the 490MHz to 700MHz range using a fixed multiplication factor of 25. The device supports both 3.3V and 2.5V operating supplies and delivers low phase jitter, with typical RMS values of 0.32ps at 3.3V and 0.39ps at 2.5V over a 1.875MHz to 20MHz integration range. Packaged in an 8-lead TSSOP, it operates within a -40°C to 85°C ambient temperature range.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates differential LVPECL clock signals from a 19.6MHz to 28MHz crystal input
• Fixed output frequency multiplier of 25x, producing 490MHz to 700MHz outputs
• Low phase jitter performance: 0.32ps (typical) at 3.3V and 0.39ps (typical) at 2.5V
• Operates on dual power supplies: VCC (Core) and VCCA (Analog) at 3.3V or 2.5V

Clock Generators, PLLs, Frequency Synthesizers Applications

• Ethernet clock generation for Gigabit Ethernet systems
• High-speed digital interface timing synchronization
• Systems requiring low-jitter clock distribution in limited board space

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity as this part has been discontinued by Integrated Device Technology (IDT), now part of Renesas. The last time buy expired on November 2, 2016. Ensure any sourced units are verified against the original datasheet specifications, particularly regarding lead-free RoHS compliance and package integrity, given the age of the product lifecycle.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the 843081AGI-01LF when a fixed 25x multiplication ratio is required for Ethernet applications. Compare its jitter performance against other FemtoClock series devices if variable frequency synthesis is needed. Ensure the design accommodates separate analog and core power supply filtering to maintain specified jitter characteristics. Verify that the 8-pin TSSOP package fits the available PCB footprint constraints.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the FemtoClock family of clock multipliers manufactured by Integrated Device Technology (IDT). IDT was acquired by Renesas Electronics Corporation. The 'G' suffix indicates the 8-lead TSSOP package, while 'LF' denotes lead-free construction compliant with RoHS standards. The device is functionally equivalent to the 843071 model.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The datasheet identifies the 843071 as a functional replacement part. Verify pin compatibility and electrical specifications before substitution.