MAX3622CUE+T

Overview

The MAX3622CUE+T is a low-jitter precision clock generator designed for Ethernet networking applications. It integrates a crystal oscillator and a phase-locked loop (PLL) to generate high-frequency clock outputs from a 25MHz reference. The device provides one LVPECL output (QB) at 156.25MHz and one LVCMOS output (QA_C) at 125MHz. Operating on a single +3V to +3.6V supply, it features ultra-low jitter of 0.36ps RMS (12kHz to 20MHz). The component is housed in a 16-pin TSSOP package and operates within a temperature range of 0°C to +70°C.

Feature Summary

• Integrated PLL with ultra-low jitter: 0.14ps RMS (1.875MHz to 20MHz) and 0.36ps RMS (12kHz to 20MHz)
• Dual outputs: One LVPECL (156.25MHz) and one LVCMOS (125MHz)
• Single +3V to +3.6V power supply operation
• No external loop filter capacitor required

Applications

• Ethernet networking equipment
• High-frequency clock generation for digital systems

Procurement Notes

Verify the manufacturer designation as Maxim Integrated or Microsemi Corporation depending on the specific supply chain source. Confirm the suffix '+T' indicates tape-and-reel packaging and '+' denotes lead-free compliance. Ensure the operating voltage matches the specified 3.0V to 3.6V range and that the 16-TSSOP package dimensions align with the design footprint.

Selection Notes

Select this component when a low-jitter clock solution is required for Ethernet interfaces. It supports a 25MHz crystal input to synthesize 125MHz and 156.25MHz outputs. Consider the separate VCCA pin for analog power filtering to maintain noise rejection performance. Verify that the load capacitance requirements for the connected crystal (typically 18pF) are met by external capacitors.

Part Context

The MAX3622 is part of a family of precision clock generators optimized for networking. It serves as an upgrade to older solutions by integrating the oscillator and PLL into a single low-power chip. The device replaces discrete components often used for clock synthesis, reducing board space and design complexity for network switches and routers.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.