The 78Q8392L/A03 Ethernet Transceiver is a replacement for the SSI/TDK/Teridian 78Q8392L/A02 coax line transmitter/receiver. Only a single resistor value change is required for upgrading an existing 78Q8392L/A02 design to the 78Q8392L/A03. The device includes analog transmit and receive buffers, a 10 MHz on-board oscillator, timing logic for jabber and heartbeat functions, output drivers and bandgap reference, in addition to a current reference and collision detector. This transceiver provides the interface between the single-ended coaxial cable signals and the Manchester-encoded differential logic signals. Primary functional blocks include the receiver, transmitter, collision detection and jabber timer. This IC may be used in either internal or external MAU environments. The 78Q8392L/A03 is available in lead-free 16-pin plastic and 28-pin PLCC packages.
The 78Q8392L/A03 is a low‑power Ethernet coaxial transceiver that integrates analog transmit/receive buffers, a 10 MHz oscillator, timing logic, output drivers and collision detection. It is offered in lead‑free 16‑pin DIP and 28‑pin PLCC packages and complies with IEEE 802.3 10Base5/10Base2.
The document provides a functional description, detailed pin definitions, absolute maximum ratings, DC and AC operating characteristics, mechanical drawings and ordering information, along with a revision history.
| Supply Voltage | -10 V |
|---|---|
| Supply current (non‑transmitting) | 6‑8 mA |
| Supply current (transmitting) | 50‑65 mA |
| Package power dissipation | 1.0 W @ 25 °C |
| Receiver startup delay | 400‑500 ns |
| Transmitter rise time (10%‑90%) | 20‑25 ns |
It is offered in a 16‑pin lead‑free plastic DIP and a 28‑pin lead‑free plastic PLCC package.
The transceiver operates from a -10 V supply.
The device is rated for ambient temperatures up to +70 °C.