This document describes the features and characteristics of the Am79C100 Twisted-Pair Ethernet Transceiver Plus (TPEX Plus), including IEEE 802.3 compliant operation, low power consumption, automatic twisted-pair link integrity, receive polarity detection and signal inversion, link integrity test capability, transmit/receive/collision status indications, etc.
The Am79C100 Twisted‑Pair Ethernet Transceiver Plus (TPEX Plus) implements the medium attachment unit (MAU) functions for 10BASE‑T networks. It provides IEEE 802.3‑compliant operation, low power consumption from a single +5 V supply, and a range of pin‑selectable features such as link‑status indication, polarity detection, and loopback modes.
The device is offered in a 28‑pin PLCC package and includes dedicated pins for transmit, receive, collision detection, and status LEDs. Each output pin can sink up to 12 mA, allowing direct LED drive. Optional pins enable low‑receive‑threshold operation for extended cable lengths and a heartbeat test for signal quality.
| Supply Voltage | +5 V |
|---|---|
| Package Type | 28‑Pin Plastic Leaded Chip Carrier (PL 028) |
| Operating Temperature Range | 0 °C to +70 °C |
| Link Status Indicator | LNKST pin driven LOW when link functional |
It operates from a single +5 V supply.
The device is offered in a 28‑Pin Plastic Leaded Chip Carrier (PL 028).
The LNKST pin is driven LOW when the link is functional and can directly drive an LED.