Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-12-09
1990-04-10
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307451, 307463, 307243, 36523006, H03K 19094, H03K 19082
Patent
active
049163361
ABSTRACT:
A column select circuit for a memory device is disclosed which, for unselected data lines, provides a high impedance output. Each data line, and a corresponding decoded address signal, is received by a gate which passes the logic state of the data line (inverted), if selected, to a driver. The decoded address signal is also communicated to the driver, for tri-stating the driver for unselected data lines. The driver consists of a p-channel pull-up and an n-channel pull-down, with an n-channel isolation transistor connected in series therebetween. The driver output is at the junction of the pull-up and isolation devices. The gates of the pull-up and pull-down transistors are connected to the output of the gate, with the gate providing a high logic level when not selected, turning off the pull-up device. The isolation transistor is also turned off when the data line is not selected, isolating the output from both the power supply node and ground, which allows the output to be pulled by photoconduction toward mid-rail in a transient radiation event. A plurality of gate/driver pairs are provided within a stage of the select circuit, each having their outputs connected together. The select circuit may be made up of a plurality of stages constructed as described above.
REFERENCES:
patent: 4593390 (1986-06-01), Hildebrand et al.
patent: 4620116 (1986-10-01), Ozawa
Anderson Rodney M.
Miller Stanley D.
Sharp Melvin
Texas Instruments Incorporated
Wambach Margaret Rose
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