Differential emitter-coupled-logic bus driver

Details Differential emitter-coupled-logic bus driver Differential emitter-coupled-logic bus driver

1988-09-06

1989-09-26

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307473, 307495, 3072961, H03K 19086

Patent

active

048703010

ABSTRACT:
An Emitter-Coupled-Logic (ECL) bus driver circuit provides differential ECL output signals designed for bus driving applications in response to receiving differential logic input signals and when disabled by a disabling signal places the differential outputs in a low state wherein a high impedance is presented thereat. The circuit includes a single logic gate and enable/disable gate that places the logic circuit in the ECL tri-level state using incremental current in conjuction with the current drain of the logic gate to reduce current drain otherwise required. In addition, time delay through the bus driver circuit is maintained at a minimum since only one gate is required to provide the differential function.

REFERENCES:
patent: 4490630 (1984-12-01), Freeman
patent: 4596940 (1986-06-01), Schuppan et al.
patent: 4682058 (1987-07-01), Gal
patent: 4709169 (1987-11-01), Ashton et al.
patent: 4719371 (1988-01-01), Fujita et al.
patent: 4748346 (1988-05-01), Emori
patent: 4751406 (1988-06-01), Wilson
Marcello et al., "Tri-State Read/Write Control Circuit", IBM T. D. B., vol. 24, No. 1B, Jun. 1981, pp. 480-482.
Freeman, "Three-State Off-Chip Driver", IBM T.D.B., vol. 26, No. 7A, Dec. 1988, pp. 3255-3256.
Madyiwa, "Tri-State Amplifier", IBM T.D.B., vol. 20, No. 7, Dec. 1977.

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