Programmable logic and driver circuits

Details Programmable logic and driver circuits Programmable logic and driver circuits

1987-09-01

1989-05-23

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307448, 307571, H03K 1988, H03K 1994

Patent

active

048333492

ABSTRACT:
An output driver circuit is described which can be programmed by the user into tri-state or open-collector configurations, depending on the needs of the user. The driver circuit comprises a pair of a first pull-up and a pull-down FET transistor. The source of the pull-up transistor and drain of the pull-down transistor are both connected to the output of the driver. The gates of the pair of transistors are controlled by an input signal and its complement. The driver further includes a second pull-up FET whose source is connected to the output of the driver. The channel width to channel length ratio of the second pull-up transistor is at least about an order of magnitude greater than that of the first pull-up transistor. The driver further includes a control means responsive to the input signal for applying a second signal to the gate of the second pull-up transistor for programming the driver into tri-state or open-collector modes. The driver circuit may be controlled by the output of an OR gate in an AND-OR array in a FPLA or PAL device. The driver is programmable by programming the AND gate or OR gate array and applying selected input signals to the AND gate array; the driver can also be programmed permanently into the tri-state or open-collector mode.

REFERENCES:
patent: 4124899 (1978-11-01), Birkner et al.
patent: 4339676 (1982-07-01), Ramsey
patent: 4472647 (1984-09-01), Allgood et al.
patent: 4481432 (1984-11-01), Davies, Jr.
patent: 4490631 (1984-12-01), Kung
patent: 4556806 (1985-12-01), Amin
"Bus Interface PLD has 45-mA Output Drivers", Electronic Products, Apr. 1987, p. 74.
"High-Output EPLD Specializes in Building Bus Interfaces", D. James Guzy, Jr., Electronic Design, May 14, 1987, pp. 116-117, 120-121.

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