TTL tristate device with reduced output capacitance

Details TTL tristate device with reduced output capacitance TTL tristate device with reduced output capacitance

1984-03-06

1986-04-08

Anagnos, Larry N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307456, 307317A, H03K 19013, H03K 19088, H03K 19003

Patent

active

045815500

ABSTRACT:
An improved TTL tristate device with reduced output capacitance incorporates an active discharge sequence of three elements including first and second active transistor elements (Q8, Q7) in an inversion coupling and a third passive element comprising a passive diode cluster (D3, D4, D5) coupled between the base of the second transistor element (Q7) and the enable gate. The passive diode cluster is operatively arranged for delivering base drive current to the base of the second transistor (Q7) when the enable gate (A) is at high potential for operation of the output device in the bistate mode. The passive diode cluster also operatively diverts base drive current away from the base of the second transistor (Q7) when the enable gate (A) is at low potential for operation of the output device in the high impedance third state with reduced output capacitance. The first transistor element (Q8) of the active discharge sequence coupled to the base of the pull-down transistor element (Q4) follows in phase at its collector the potential maintained by the enable gate (A). It actively conducts, discharges and diverts capacitive feedback Miller current from the base of the pull-down transistor element (Q4) when the enable gate is at low potential, and presents a high impedance to current in the direction of the base of the pull-down transistor element (Q4) when the enable gate is at high potential. The power resistors to the active discharge sequence are arranged in a Y network with a capacitive center node.

REFERENCES:
patent: 3394268 (1968-07-01), Murphy
patent: 3808457 (1974-04-01), Filippov et al.
patent: 4151609 (1979-04-01), Moss
patent: 4255670 (1981-03-01), Griffith
patent: 4311927 (1982-01-01), Ferris
patent: 4339675 (1982-07-01), Ramsey
patent: 4400635 (1983-08-01), Mazgy
patent: 4498022 (1985-02-01), Koyama
patent: 4518876 (1985-05-01), Constantinescu

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