HYC9088

Operating Temperature Range................................................................................0 to +70
Storage Temperature Range ............................................................................ -55° to +150
Lead Temperature Range (soldering, 10 seconds) ...........................................................+325
Positive Voltage on any pin, with respect to Ground .....................................................Vcc+0.3V
Negative Voltage on any pin, except VDD, with respect to Ground...................................... -0.3V

*Stresses above those listed above could cause permanent damage to the device. This is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied.

Note: When powering this device from laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes on their outputs when the AC power is switched on or off. In addition, voltage transients on the AC power line may appear on the DC output. If this possibility exists, it is suggested that a clamp circuit be used.

The HYC9088 Twisted Pair and Coaxial Compatible High Impedance Transceiver (HIT) is a hybrid module that interfaces an ARCNET Local Area Network controller to one twisted pair or coaxial cable. The HIT interfaces directly with Standard Microsystems Corporation's ARCNET LAN controllers operating at 2.5 Mbps and connects to a variety of shielded and unshielded twisted pair or coaxial cables via an on-board transformer. The network topologies supported by the HIT are daisy chain, star, and bus configurations.

During data transmission, the HIT converts the digital pulse information provided by the LAN controller into analog signals and drives them onto the cable. The transmitted signals are filtered to eliminate undesirable frequencies. The receiver section of the HYC9088 identifies dipulse signals on the cable and converts them into TTL signals to be supplied to the LAN controller.

The HIT supports ARCNET's Dipulse Encoding Scheme and, is 100% compatible with all existing coax-based ARCNET networks. This provides an ARCNET network designer with flexibility to easily combine coax and twisted pair cabling.

The HYC9088 is pin compatible with the HYC9058  High Impedance Transceiver and is pin compatible with the HYC9068 LAN Driver with the addition of a single terminating resistor.