Electronic digital logic circuitry – Interface – Logic level shifting
Patent
1992-11-25
1994-12-06
Westin, Edward P.
Electronic digital logic circuitry
Interface
Logic level shifting
326121, 327333, H03K 190175, H03K 19094
Patent
active
053714245
ABSTRACT:
A transmitter/receiver circuit (19) for interfacing digital signals having logic levels of different voltage ranges. The transmitter/receiver circuit comprises a transmitter circuit (21) , a resistive load (23) , and a receiver circuit (22). The transmitter circuit (21) having a first input (24) which receives a digital signal of a first voltage range, a second input (26) which receives a control signal, a first terminal (27) and a second terminal (28). The resistive load (23) couples the first (27) and second (28) outputs together. The transmitter circuit (21) generates complementary digital signals at the first terminal (27) and the second terminal (28) having logic levels of a second voltage range. The transmitter circuit (21) can be disabled by the control signal. The receiver circuit (22) has a first and a second input coupled to the first (27) and second (28) terminals respectively and has an output (29). The receiver circuit (22) senses a voltage difference between the first (27) and second (28) terminals and generates a digital signal of the first voltage range at the output (29).
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Caravella James S.
Quigley John H.
Hoshizaki Gary W.
Motorola Inc.
Roseen Richard
Westin Edward P.
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