TI380C60A CMOS TOKEN-RING INTERFACE DEVICE

SPWS033 - DECEMBER 1996

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features

Facilitates Connection of the TI380C25, TMS380C26, or TI380C27 to Token Ring
Internal Crystal Oscillator for Reference-Clock Generation
Loop Back (Wrap Mode) for Self-Test Diagnostics
Compatible With Electrical Interface of ISO/IEC 8802.5: 1995 (ANSI/IEEE Std. 802.5) Token-Ring Access Method and Physical Layer Specifications
Glueless Interface to TI380C2x Commprocessor for Token Ring
16- and 4-Mbps Token-Ring Data Rates With no External Switching Circuits
Repeater Application Requires no Additional Active Components
Digital Phase-Locked Loop
- Provides Precise Control of Bandwidths
- Provides Improved Jitter Tolerance
- Minimizes Accumulated Phase Slope
Phantom Drive for Physical Insertion Onto Ring
Differential Line Receiver With Level-Dependent Frequency Equalization
Low-Impedance Differential Line Driver to Ease Transmit-Filter Design
On-Chip Watchdog Timer
Low-Power 0.8-um Enhanced Performance Implanted CMOS (EPIC^TM) Technology by Texas Instruments (TI^TM)
PCMCIA-Compatible 52-Lead 1,0-mm Plastic Quad Flatpack

description

EPIC and TI are trademarks of Texas Instruments Incorporated.

The TI380C60A 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 TI380C60A 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 TI380C60A 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 TI380C60A, 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 TI380C60A 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.

The TI380C60A can function as a stand-alone device because the digital PLL is self-contained and requires no additional circuits for frequency management. Using the device in this manner in the repeat mode provides a highly integrated token-ring repeater with no additional active components needed for wiring center applications.

The TI380C60A is available in a 52-lead 1,0-mm plastic quad flatpack and is characterized for operation from 0°C to 95°C with a typical power dissipation of 600 mW.

Title: TI380C60A CMOS TOKEN-RING INTERFACE DEVICE
Product Family: NETWORKING COMPONENTS
Device Functionality: TOKEN RING
Orderable Devices: TI380C60APAH, TI380C60APAHR

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View more information about generic part numbers:TI380C60A

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