The TI380C60 token-ring interface device is a full-duplex electrical interface compatible with ISO / IEC 8802.5:1995 (ANSI / IEEE Std. 802.5) token-ring access method and physical layer specifications. The TI380C60 operates at the IEEE standard 4- and 16-Mbps data rates. The Manchester-encoded data stream is received and phase-aligned using an on-chip phase-locked loop ( PLL). Both the recovered clock and data are passed to the protocol-handling circuits of one of the TI380C2x single-chip token-ring COMMprocessors for serial-to-parallel conversion and data processing. On transmit, the TI380C60 buffers the output of the TI380C2x and drives the media by way of suitable isolation and waveform-shaping components. All necessary functions required to interface with an IEEE-802.5 token ring are provided. These include the PLL, the phantom drive to control the relays within a trunk-coupling unit, and wire-fault detection circuits. An internal wrap function is provided for self test, and a watchdog timer is included to provide fail-safe deinsertion from the ring in the event of a station microcode or COMMprocessor failure. The TI380C60, when coupled with one of the TI380C2x token-ring COMMprocessors, forms a highly integrated token-ring LAN adapter compatible with the ISO / IEEE Standard 802.5. The TI380C60 synthesizes the necessary token-ring reference clock for its own use and for the TI380C2x. This removes the need for external components to provide this function. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. EPIC is a trademark of Texas Instruments Incorporated. Copyright 1996, Texas Instruments Incorporated