MAX3638ETM2T

Overview

The MAX3638ETM2T is a low-jitter, wide frequency range programmable clock generator with ten outputs. It features subpicosecond jitter generation and excellent power-supply noise rejection. The device includes nine differential outputs (LVDS/LVPECL) and one LVCMOS output, divided into three individually programmable banks. It operates from a +3.3V supply within a -40°C to +85°C temperature range. Electrical specifications include an LVCMOS input up to 160MHz, a differential input up to 350MHz, and LVDS/LVPECL outputs up to 800MHz. Integrated phase jitter is 0.34ps RMS (12kHz to 20MHz).

Feature Summary

• Low integrated phase jitter of 0.34ps RMS (12kHz to 20MHz) and 0.14ps RMS (1.875MHz to 20MHz)
• Three individual output banks with pin-programmable dividers and interface selection (LVDS/LVPECL/LVCMOS)
• Wide VCO tuning range from 3.83GHz to 4.025GHz with excellent power-supply noise rejection (-74dBc spur at LVPECL/LVDS output)
• Supports crystal, LVCMOS, and differential inputs for flexible reference clock configuration

Applications

• Ethernet Switch/Router
• Wireless Base Station
• PCI Express (PCIe) Network Processors
• DDR/QDR Memory Systems

Procurement Notes

Verify the specific suffix '2T' against official documentation to confirm tape-and-reel packaging details. Confirm current availability status as this component family may have discontinuation notices. Ensure compatibility with existing board layouts regarding the 48-TQFN package dimensions.

Selection Notes

Select based on required output frequencies and interface types (LVDS vs. LVPECL). Ensure the reference clock frequency allows for valid PLL configurations within the 15MHz to 42MHz PFD compare frequency range. Verify power supply filtering requirements for the VCCA pin to maintain optimal jitter performance.

Part Context

The MAX3638 is part of a series of precision phase-locked loop clock generators designed for high-speed data transmission equipment. It serves as a replacement for multiple crystal oscillators and clock distribution ICs, saving cost and space on system boards. The device is optimized for network equipment demanding robust clock generation.

Replacement Considerations

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