78Q8392LA03-CP/F

Overview

The 78Q8392LA03-CP/F is a low-power Ethernet coaxial transceiver designed for IEEE 802.3 10Base5 and 10Base2 networks. It integrates analog transmit/receive buffers, a 10 MHz oscillator, collision detection, jabber timer, and heartbeat logic. Operating from a -9V supply (±5%), it draws 6 mA in non-transmitting mode and 50 mA when transmitting. The device provides differential outputs with ±1200 mV swing and supports data rates up to 10 Mbps. It interfaces single-ended coaxial signals to Manchester-encoded differential logic.

Feature Summary

• Integrates complete transceiver functions including receiver equalization, transmitter pulse shaping, and collision signaling.
• Includes on-chip timing logic for jabber protection and externally selectable heartbeat functionality.
• Features squelch circuitry at all inputs to reject noise and crosstalk on the transmission media.
• Supports both internal and external MAU environments with minimal external component requirements.

Applications

• Ethernet 10Base5 thick coaxial network interfaces
• Ethernet 10Base2 thin coaxial network interfaces
• Internal or external Medium Access Unit (MAU) implementations

Procurement Notes

Verify the datasheet revision level matches Rev 1.3 or later to ensure accurate package dimensions and ordering information. Confirm that the specific suffix CP/F corresponds to the lead-free 16-pin plastic DIP variant as listed in the manufacturer's ordering guide. Cross-reference part numbers carefully due to historical transitions between Teridian Semiconductor and Analog Devices/Maxim Integrated branding.

Selection Notes

Select this component for legacy 10 Mbps coaxial Ethernet designs requiring low power consumption and integrated signal conditioning. Ensure the design accommodates the -9V negative supply requirement and utilizes the specified 976 Ω resistor between RR+ and RR- pins for proper current biasing. Verify compatibility with existing 78Q8392L/A02 designs if upgrading, noting only the external resistor value change is required.

Part Context

This component is part of the 78Q8392L series of Ethernet transceivers originally manufactured by Teridian Semiconductor Corporation. It serves as a direct replacement for the 78Q8392L/A02 model, maintaining functional compatibility while offering improved power efficiency. The product line has been absorbed into the Analog Devices/Maxim Integrated portfolio following corporate acquisitions.

Replacement Considerations

The 78Q8392LA03-CP/F is explicitly documented as a replacement for the 78Q8392L/A02. Upgrading requires changing only a single external resistor value from 1kΩ to 976Ω. No other circuit modifications are necessary for direct substitution within compatible 10Base5/10Base2 architectures.