78Q2123/F

Overview

The Analog Devices Inc. (Maxim Integrated) 78Q2123/F is a MicroPHY Fast Ethernet transceiver designed for embedded applications. It supports 10BASE-T and 100BASE-TX standards over Category-5 or Category-3 unshielded twisted pair cabling. The device integrates MII, ENDECs, scrambler/descrambler, dual-speed clock recovery, and auto-negotiation functions. It operates from a single 3.3V supply with low power consumption of approximately 290mW. The 78Q2123 variant is rated for commercial temperature range operation from 0°C to 70°C.

Feature Summary

• Integrated Media Independent Interface (MII) and full-featured auto-negotiation compliant with IEEE-802.3
• Automatic MDI/MDI-X crossover correction and automatic polarity correction during signal reception
• Programmable transmit amplitude and user-programmable interrupt pin functionality
• Multiple power-saving modes including chip power-down, receive power management, and transmitter high impedance mode

Applications

• Game consoles
• Broadband modems
• Printers
• Set top boxes
• Audio/video equipment

Procurement Notes

Verify the specific suffix 'F' against official documentation to confirm package type and temperature rating. Ensure the component source matches Analog Devices Inc. or Maxim Integrated specifications. Confirm that the ordering information aligns with the commercial temperature range requirements for the 78Q2123 model.

Selection Notes

Select the 78Q2123 for commercial temperature environments ranging from 0°C to 70°C. Choose the 78Q2133 if industrial temperature ratings from -40°C to 85°C are required. Both models share identical functional capabilities and support single 3.3V supply operation. Verify compatibility with the target MAC interface via the standard MII connection.

Part Context

The 78Q2123 belongs to the MicroPHY family of Fast Ethernet transceivers manufactured by Analog Devices Inc., formerly Maxim Integrated. This series includes the 78Q2133, which shares the same electrical and functional characteristics but is rated for extended industrial temperatures. The devices are designed to minimize board space while providing complete PHY layer functionality.

Replacement Considerations

The 78Q2133 is the industrial temperature-rated counterpart to the 78Q2123. Substitution requires verifying that the operating environment falls within the commercial range of the 78Q2123. No other direct substitutes are confirmed in the provided documentation.