Combination output/input logic for integrated circuit

Details Combination output/input logic for integrated circuit Combination output/input logic for integrated circuit

1974-12-13

1976-01-27

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307205, 307216, 307303, H03K 1908, H03K 1932

Patent

active

039354768

ABSTRACT:
Method and circuit for both outputting and inputting data by way of a single pin connector for an integrated circuit chip is disclosed. Data from the chip is fed through an output buffer on the chip and a standard pin connector to external circuitry. The input and the output of the output buffer are connected to separate logic inputs of a comparator such as an EXCLUSIVE OR gate. For data output, the external circuitry allows the output buffer to follow the input of the buffer, in which case the output of the EXCLUSIVE OR gate is a logic 0. However, when the external circuitry overrides the output of the output buffer causing the output to be different from the input to the buffer, the output of the EXCLUSIVE OR gate produces a logic 1 signal which indicates that data is being input and that the data at the pin connector is valid input data.

REFERENCES:
patent: 3573756 (1971-04-01), Hillis et al.
patent: 3699544 (1972-10-01), Joynson et al.

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