A new interfacing method `SCFL-interfacing' is proposed forultra-high-speed logic ICs

摘要

A new I/O interfacing method called `SCFL-interfacing' as astandard interfacing for ultra-high speed logic ICs. The purpose is toavoid the waveform degradation and further difficulties inherent inconventional ECL-interfacing when operating above 1 Gb/s.Characteristics of the proposed method include: (1) high and log I/Olevels of typically 0.0 V and -0.9 V, respectively; (2) on-chip 59 ohmresistors as receiving-end terminators; and (3) signal distributor ICsfor multi-fanout connections. The authors strongly believe thatSCFL-interfacing is highly effective for ICs operating above 10 Gbit/s.However, as a first step, to insure compatibility with conventional ICs,they developed an 8 Gb/s GaAs standard logic IC family using a modifiedSCFL-interfacing in which both SCFL and ECL interfaces are available