GENERAL DESCRIPTION

The Am79C100 Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) is an integrated circuit that implements the medium attachment unit (MAU) functions for the twisted-pair medium, as specified by the supplement to the IEEE 802.3 standard (Type 10BASE-T). This device provides the necessary electrical and functional interface between the IEEE 802.3 standard attachment unit interface (AUI) and the twisted-pair cable.

DISTINCTIVE CHARACTERISTICS

■ CMOS device provides IEEE 802.3-compliant operation and low operating current from a single +5 V supply

■ Power Down mode for reduced power consumption in battery-powered applications

■ Automatic twisted-pair link integrity

■ Pin-selectable twisted-pair receive polarity detection and automatic inversion of the receive signal. Polarity indication output pin can directly drive an LED.

■ Pin-selectable twisted-pair link integrity test capability conforming to the IEEE 802.3 standard. Link status pin can directly drive an LED.

■ Transmit, receive, and collision status indications available on separate, dedicated pins

■ Outputs can directly drive LEDs with pulses stretched to ensure LED visibility

■ Internal twisted-pair transmitter digital predistortion circuit to reduce medium-induced jitter

■ Pin-selectable SQE Test (heartbeat) enable

■ AUI loopback, Jabber Control, and SQE Test functions comply with the 10BASE-T standard

■ User-selectable loopback operations

■ Pin-selectable twisted-pair receive threshold programming for extended distance line lengths