Voltage change circuit for a microcomputer

Details Voltage change circuit for a microcomputer Voltage change circuit for a microcomputer

1992-07-29

1994-09-27

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307243, 3072965, 307572, 307576, 365185, H03K 1716, H03K 1706

Patent

active

053509510

ABSTRACT:
A microcomputer including first, a voltage change circuit which includes circuitry for selecting one of two voltages applicable to a PROM and, second, leak current prevention circuitry for preventing a current from leaking from a first terminal at a first voltage through first and second switching elements to a second terminal. The leak current prevention circuitry can be a transistor whose source, drain and gate are tied to the first terminal, to the gate of the second switching element and to the second terminal, respectively. The leak current prevention circuitry operates to cut off the second switching element which the voltage at the second terminal is zero. The circuitry for selecting can be two series circuit, each consisting of a diode and two transistors. The series circuits are interconnected and responsive to a voltage selecting signal.

REFERENCES:
patent: 4689504 (1987-08-01), Raghunathan et al.
patent: 4694430 (1987-09-01), Rosier
patent: 4835423 (1989-05-01), de Ferron et al.
patent: 4876462 (1989-10-01), Kobatake et al.
patent: 4893275 (1990-01-01), Tanaka et al.
patent: 4937787 (1990-06-01), Kobatake
patent: 5109257 (1992-04-01), Kondo
patent: 5214327 (1993-05-01), Saeki et al.

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