TMS38054 RING INTERFACE DEVICE

SPWS008C - APRIL 1991 - REVISED MAY 1997

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features

• Facilitates Connection of the TI380C25, TI380C27, or TMS380C26 to a Token-Ring Network^TM
• Compatible With Electrical Interface of ISO/IEC IEEE Std 802.5:1992 Token-Ring Access Method and Physical-Layer Specifications
• Constant-Gain Phase Detector for Unshielded Twisted Pair (UTP) Applications
• Phase-Locked Loop (PLL) for Clock Generation and Data Signal Recovery
• Independent Transmit and Receive Channels
• Phantom Drive for Physical Insertion Onto Ring
• 16-Mbps and 4-Mbps Token-Ring Data Rates
• Integrated Receiver Frequency Equalization
• Loop Back (Wrap Mode) for Self-Test Diagnostics
• On-Chip Watchdog Timer
• ESD Protection Meets 1.5 kV Per MIL-STD-883C, Method 3015
• Advanced Low-Power Schottky Technology
• Packaged in Plastic J-Leaded Chip Carrier

Token-Ring Network is a trademark of International Business Machines Corporation.

description

The TMS38054 ring interface device and its associated external passive components form a full-duplex electrical interface to the token ring. Coupling the TMS38054 with one of the TMS380 family of commprocessors forms a highly integrated token-ring LAN adapter compatible with the ISO/IEC IEEE Std 802.5:1992 token-ring access method and physical-layer specifications.

The TMS38054 operates at the IEEE-standard 16-Mbps and 4-Mbps data rates. The token-ring data stream is received by the TMS38054 and phase aligned using an on-chip phase-locked loop (PLL). The recovered clock and data are passed to the TI380C2x single-chip token-ring commprocessor's protocol-handling circuits for serial-to-parallel conversion and data processing. On transmit, the TMS380C2x provides a differential signal that the TMS38054 converts to analog levels for transmission on the media. A watchdog timer also is included to provide fail-safe deinsertion from the ring in the event of a station failure. The phase-detector gain is constant for all valid differential Manchester data that provide increased margin for unshielded twisted-pair applications.

The TMS38054 is available in a 44-lead plastic chip carrier. The TMS38054 is characterized for operation from 0°C to 70°C with case temperature maintained at or below 99°C.

View more information about generic part numbers:TMS38054

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