78Q2120C09-64CGTR/F

Overview

The 78Q2120C09-64CGTR/F is a 10BASE-T/100BASE-TX Fast Ethernet transceiver manufactured by Analog Devices Inc./Maxim Integrated. It complies with IEEE-802.3 standards and supports full-duplex operation for simultaneous data transmission and reception. The device integrates MII, ENDECs, scrambler/descrambler, dual-speed clock recovery, and auto-negotiation functions. It interfaces with Cat-5 UTP cabling for 100BASE-TX/10BASE-T and Cat-3 UTP for 10BASE-T. Key features include automatic polarity correction, PCS bypass, and programmable transmit amplitude. It operates on a single 3.3 V ± 0.3V supply within an operating temperature range of 0°C to 70°C.

Feature Summary

• Supports full-duplex operation for simultaneous data transmission and reception
• Integrates MII, ENDECs, scrambler/descrambler, and full-featured auto-negotiation
• Includes automatic polarity correction during auto negotiation and signal reception
• Features power-saving and power-down modes including transmitter disable

Applications

• Network devices
• Industrial control systems
• Ethernet infrastructure equipment

Procurement Notes

Verify the part number suffix 'TR/F' indicates tape and reel packaging when sourcing. Confirm the manufacturer designation as Analog Devices Inc./Maxim Integrated, reflecting the corporate merger context. Ensure the component matches the 64-LQFP package specification. Check for recent date codes to guarantee product freshness. Validate authenticity through authorized distribution channels to avoid counterfeit components.

Selection Notes

Select this component for applications requiring IEEE-802.3 compliant 10/100BASE-TX connectivity. It is suitable for designs needing integrated auto-negotiation and polarity correction without external logic. Consider the single 3.3V supply requirement for power budgeting. Evaluate the 64-LQFP package size for PCB layout constraints. Verify compatibility with Cat-5 or Cat-3 cabling requirements for the specific network segment.

Part Context

This transceiver belongs to the 78Q2120 series of Fast Ethernet PHYs from Maxim Integrated, now part of Analog Devices. The series provides complete physical layer solutions for Ethernet networks. The 64-pin LQFP package facilitates surface-mount assembly. The device replaces older discrete Ethernet solution components by integrating multiple functions onto a single chip.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult official Analog Devices or Maxim Integrated resources for current replacement recommendations.