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EP0025483A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Self-switching bidirectional digital line drivers

Assignee: International Business Machines Corp
•
Filing: 1980-07-10
•
Granted: —
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Expires: 2000-07-10
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Abstract

Abstract To provide reduced vulnerability to glitches, a self switching bidirectional digital line driver comprises two identical circuits (10; 20), coupled in opposite senses between interface nodes (11, 21) and comprising a receiver (12; 22), a NOR gate (13; 23) and a transmitter (20; 15) and a transmitter connected in series. The output (14; 24) of each gate supplies an input to the other gate directly and via a latch (16; 26), resettable by the output of the opposing receiver. Each transmitter has one relaxed mode preferably provided by an open collector transistor and the logic is such that from a rest state corresponding to both transmitters being in the relaxed mode, the switching of one gate locks the other gate into the relaxed mode.

Inventors

  • 👤 Rafael Pelc

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 21:18
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/14; H04L5/1461; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/66; H03K17/665

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 73 words
A self-switching bidirectional digital line driver adapted to interface between two logically biassed external environments (5;7;8: 5';7';8') characterized in that the driver comprises two similar circuits (10;20) connected in parallel but in opposite senses between the external environment interfacts (11;21), each circuit having input logic (13;23) and an output element (25;15) having one relaxed mode, the input logic of each circuit being symmetrically cross-coupled, directly and via a latch (16:26), output to input.
Claim 2
Dependent Claim 73 words
A self-switching bidirectional digital line driver adapted to interface between two logically biassed external environments (5;7;8: 5';7';8') characterized in that the driver comprises two similar circuits (10;20) connected in parallel but in opposite senses between the external environment interfacts (11;21), each circuit having input logic (13;23) and an output element (25;15) having one relaxed mode, the input logic of each circuit being symmetrically cross-coupled, directly and via a latch (16:26), output to input.
Claim 3
Dependent Claim 35 words
A driver as claimed in claim 1 characterized in that the input logic performs the NOR function of the input and the two cross-coupling signals, the input providing the resetting signal for the latched cross-coupling.
Claim 4
Dependent Claim 44 words
A driver as claimed in either preceding claim characterized in that each output element incorporates an open collector transistor (T51) and each input logic is coupled to its appropriate interface via a receiver (12;22) adapted to provide an acceptable input signal to the logic.

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