Integrated circuit chips with multiplexed input/output pads and

Details Integrated circuit chips with multiplexed input/output pads and Integrated circuit chips with multiplexed input/output pads and

1996-05-22

1997-10-14

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Multiplexing

36518905, 36518908, 36523002, 36523008, G11C 700, G11C 800

Patent

active

056778775

ABSTRACT:
Integrated circuit chips with multiplexed input/output pads include means for expanding the functional and diagnostic capability of the circuit by increasing the effective number of input/output pads connected thereto so that more information can be provided to and from the chip. In particular, multiplexing means preferably provides the capability of accessing any one of a plurality of signal lines in the circuit from each input/output pad. This expanded capability is preferably achieved using one or more selection control signals which can be generated internally or externally to a chip containing the integrated circuit. An integrated circuit memory device, for example, preferably comprises a semiconductor substrate, a memory circuit in the substrate, a plurality of input/output pads and means, coupled to signal lines in the memory circuit, for multiplexing the plurality of input/output pads to the signal lines by electrically connecting respective ones of the signal lines to the input/output pads in response to a first select signal and electrically connecting respective others of the signal lines to the input/output pads in response to a second select signal. Because each pad on a chip can be connected to one or more signal lines, the memory circuit has a greater number of effective pads which means that a fewer number of pads on a small memory circuit chip can provide essentially the same input/output capability as a greater number of pads on a larger chip.

REFERENCES:
patent: 4899313 (1990-02-01), Kumanoya et al.
patent: 5179573 (1993-01-01), Yamada
patent: 5227997 (1993-07-01), Kikuda et al.
patent: 5307321 (1994-04-01), Sasai et al.
patent: 5357477 (1994-10-01), Matsumoto et al.
patent: 5519655 (1996-05-01), Greenberg

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