DESCRIPTION
The NE83Q93 is a low power coaxial transceiver interface (CTI) for Ethernet (10base5) and Thin Ethernet (10base2) local area networks. The CTI is connected between the coaxial cable and the Data Terminal Equipment (DTE) and consists of a receiver, transmitter, receive-mode collision detector, heartbeat generator and jabber timer (see Block Diagram). The transmitter output connects directly to a doubly terminated 50Ω cable, while the receiver output, collision detector output and transmitter input are connected to the DTE through isolation transformers. Isolation between the CTI and the DTE is an IEEE 802.3 requirement that can be met on signal lines by using a set of pulse transformers. Power isolation for the CTI is achieved using DC-to-DC conversion through a power transformer (see Figure 1, Connection Diagram).

FEATURES
• Fully compliant with Ethernet II, IEEE 802.3 10BASE-5 and 10BASE-2, and ISO 8802/3 interface specifications
• Functionally compatible with industry standard 8392 applications
• Optimal implementation can use 1 Watt DC-DC converter and reduces external parts count
• High efficiency AUI drivers minimize current consumption under idle conditions by automatically powering-down
• Automatically disables AUI drivers when disconnecting coax cable, allowing hard-wiring of AUI connector and local/integrated CTI connection
• Smart squelch on data inputs eliminates false activations
• Transmit enable input and carrier sense output for repeater applications
• Five LED status drivers for transmit, receive, collision, jabber and link fail indication
• Advanced BiCMOS process for extremely low power operation
• Available in 24-pin DIP and 24-pin SOL packages
• Full ESD protection
• Power-on reset prevents glitches on coaxial cable