MAX3624AETJ2

Overview

The MAX3624AETJ2 is a low-jitter, precision clock generator optimized for networking applications. It integrates a crystal oscillator and a phase-locked loop (PLL) clock multiplier to generate high-frequency clock outputs for Ethernet, Fibre Channel, SONET/SDH, and other networking applications. The device features ultra-low jitter of 0.36ps RMS (12kHz to 20MHz) and excellent power-supply noise rejection. It operates with a supply voltage range of 3V to 3.6V and supports an operating temperature range from -40°C to +85°C. The component is housed in a 32-TQFN package with dimensions of 5x5 mm.

Feature Summary

• Ultra-low jitter performance: 0.14ps RMS (1.875MHz to 20MHz) and 0.36ps RMS (12kHz to 20MHz)
• Integrated crystal oscillator interface supporting frequencies from 19.375MHz to 27MHz
• Four outputs: three LVPECL (QA, QB0, QB1) and one LVCMOS (QA_C)
• Excellent power-supply noise rejection without requiring external loop filter capacitors

Applications

• Ethernet Networking Equipment
• Fibre Channel Storage Area Network
• SONET/SDH Network

Procurement Notes

Verify the suffix '2' indicates a lead-free/RoHS-compliant package when sourcing replacements. Confirm the manufacturer designation as Microchip Technology or its predecessor entities. Ensure the package type matches the 32-TQFN specification with an exposed pad for proper thermal and electrical grounding.

Selection Notes

Select this component for applications requiring precise clock synthesis with minimal jitter. The device supports input frequencies via crystal (19.375MHz to 27MHz) or CMOS/LVTTL (up to 40.5MHz). Output dividers allow generation of standard frequencies such as 125MHz, 156.25MHz, and 312.5MHz for Ethernet, or 106.25MHz and 212.5MHz for Fibre Channel.

Part Context

The MAX3624AETJ2 belongs to the MAX3624A series of low-jitter clock generators. The 'ETJ' suffix denotes the 32-pin Thin Quad Flatpack No-lead (TQFN) package with an exposed pad. This series is designed to minimize design risk for network equipment through proprietary PLL technology that offers superior noise immunity compared to standard synthesizers.

Replacement Considerations

The suffix '2' specifically denotes a lead-free/RoHS-compliant package variant. When replacing, ensure the substitute part maintains the same 32-TQFN footprint and electrical characteristics, particularly the 0.36ps RMS jitter specification and 3V to 3.6V supply range.

FAQ

What are the supported output frequencies for Ethernet applications?

For Ethernet applications, the MAX3624AETJ2 can generate output frequencies of 62.5MHz, 125MHz, 156.25MHz, and 312.5MHz.

Does the device require an external loop filter capacitor?

No, the MAX3624AETJ2 does not require an external loop filter capacitor due to its integrated PLL design.

What is the maximum operating frequency for the LVCMOS output?

The maximum guaranteed operating frequency for the LVCMOS output (QA_C) is 160MHz.