Input circuit receiving input signal of TTL level

Details Input circuit receiving input signal of TTL level Input circuit receiving input signal of TTL level

1993-11-30

1995-08-01

Hudspeth, David R.

Electronic digital logic circuitry

Interface

Logic level shifting

326 33, 327143, H03K 190175

Patent

active

054382807

ABSTRACT:
A signal input circuit having a CMOS inverter for receiving an input signal of a TTL level is disclosed. This circuit includes a first transistor of one channel type connected between a first power terminal and an output terminal and having a gate connected to an input terminal, a second transistor of an opposite channel type connected between a second power terminal and the output terminal and having a gate connected to the input terminal, and a current gain control circuit coupled to the first transistor for controlling the current gain of the first transistor to a first value when a power voltage is at a first level and to a second value when the power voltage is at a second level.

REFERENCES:
patent: 4763022 (1988-08-01), Sheldon
patent: 4929853 (1990-05-01), Kim et al.
patent: 4999529 (1991-03-01), Morgan, Jr. et al.
patent: 5304872 (1994-04-01), Avraham et al.
patent: 5341045 (1994-08-01), Almulla

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