A 140 Mbit/s CMOS LSI Framer Chip for a Broadband ISDN Local Access System

H. Jonathan Chao, Thomas J. Robe, Lanny S. Smoot

Research output: Contribution to journalArticlepeer-review


A CMOS LSI framer chip, which provides a SONET-like time-division multiplexed (TDM) frame structure, and which has been implemented in a production 2-üm technology, is described. Current samples of the chip have been tested functional to 160 Mbit/s. The primary attributes presented include the circuit features employed to achieve high-bit-rate operation, the level translation circuits which afford direct interfacing to ECL level clock and data signals, and the functional capabilities which lead to broad application of the chip in communications networks. Several examples of its use in a prototype broadband local access network are also described. The chip operates from a single 5-V supply, dissipates approximately 420 mW, and is packaged in a 68-pin leadless ceramic chip carrier (LCCC) package.

Original languageEnglish (US)
Pages (from-to)133-141
Number of pages9
JournalIEEE Journal of Solid-State Circuits
Issue number1
StatePublished - Feb 1988

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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