PI6LC4820ZDEX

Overview

The PI6LC4820ZDEX is a HiFlex Ethernet Network Clock Generator manufactured by Diodes Incorporated. It operates on a 3.3V supply and supports crystal or differential inputs at frequencies such as 25 MHz and 156.25 MHz. The device generates output frequencies of 312.5, 156.25, and 125 MHz using programmable dividers. It features nine LVPECL or LVDS selectable outputs across three banks with low integrated phase noise (max 1ps rms from 12kHz to 20MHz). Packaged in a 48-lead 7x7mm TQFN, it includes PLL bypass modes and power supply noise rejection capabilities for advanced Gigabit Ethernet systems.

Feature Summary

• Supports output frequencies of 312.5, 156.25, and 125 MHz via programmable dividers
• Features nine LVPECL or LVDS bank-selectable outputs with max 1ps integrated phase noise
• Accepts 25 MHz crystal input or differential inputs (LVDS, LVPECL, HCSL) up to 156.25 MHz
• Includes PLL bypass mode for testing and -50 dBc typical power supply noise rejection

Applications

• Advanced Gigabit Ethernet systems
• 10GbE applications requiring low jitter clock generation
• Ethernet network clock distribution

Procurement Notes

Verify the datasheet revision and ordering suffixes when sourcing. The 'X' suffix indicates Tape/Reel packaging, while 'E' denotes Pb-free and Green compliance. Confirm package code ZD corresponds to the 48-pin TQFN form factor. Ensure compatibility with required frequency select pin configurations for target output rates.

Selection Notes

Select this component for designs requiring simultaneous multi-frequency outputs (125/156.25/312.5 MHz) from a single source. Ensure PCB layout adheres to the recommended crystal circuit guidelines, specifically keeping X1/X2 traces narrow and avoiding vias in the loop. Verify that the 3.3V supply voltage range (3.0V to 3.6V) matches the system power rails.

Part Context

The PI6LC4820 belongs to the HiFlex family of clock generators designed for Ethernet networking. The PI6LC4820ZDEX variant specifically utilizes the ZD package code for the 48-pin TQFN housing and includes the X suffix for reel packaging. It succeeds earlier Pericom Semiconductor designs now under Diodes Incorporated.

Replacement Considerations

Check for updated revisions within the PI6LC4820 series. Verify if alternative HiFlex models support the same specific frequency combinations and output interface types (LVPECL/LVDS) without requiring significant schematic changes.