TTL circuit with a clamping transistor for speedy turn-off of ou

Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock

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Details

307456, 307280, 307549, H03K 19013, H03K 19088

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active

046314229

ABSTRACT:
A first output transistor, operated in the common emitter mode, has its conduction path connected between an output terminal and a first point of operating potential. A phase splitting transistor whose base is coupled to a signal input terminal supplies a turn-on current to the base of the first transistor for one value of input signal and interrupts the flow for another value of input signal. The discharge of residual charge on the base of the first transistor and its speedy turn-off is accomplished by means of a clamping transistor whose collector-to-emitter path is connected between the base and emitter of the first transistor and which is turned on concurrently with the turn-off of the phase splitting transistor.

REFERENCES:
patent: 3641368 (1972-02-01), Gamble et al.
patent: 3958136 (1976-05-01), Schroeder
patent: 4330723 (1982-05-01), Griffith
patent: 4449063 (1984-05-01), Ohmichi et al.
patent: 4506176 (1985-03-01), Harris

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