Large scale integrated circuit device for switching oscillation

Details Large scale integrated circuit device for switching oscillation Large scale integrated circuit device for switching oscillation

1991-08-07

1992-09-29

Howell, Janice A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307269, 3074821, 328 61, 331 49, 331 59, H03K 1756, H03K 513, H03K 301, H01L 2500

Patent

active

051516136

ABSTRACT:
An integrated circuit device having a CR oscillation circuit and a crystal oscillation circuit and capable of selecting either the CR oscillation circuit or the crystal oscillation circuit, includes a unit for receiving an electrical signal, and a unit for selecting either the CR oscillation circuit or the crystal oscillation circuit in accordance with a state of the electrical signal received by the receiving unit. The integrated circuit device also includes a unit for holding the receiving unit at a predetermined level of the electrical signal. The holding unit is adapted to hold the receiving unit at the predetermined level in accordance with a state of the receiving unit. The receiving unit is a selection terminal and the selecting unit is a selection circuit. The selection circuit includes a first analog switch and a second analog switch for controlling the crystal oscillation circuit, and an OR gate for controlling a selection of either the CR oscillation circuit or the crystal oscillation circuit in accordance with the electrical signal received at the selection terminal.

REFERENCES:
patent: 4321562 (1982-03-01), Igarashi
patent: 4370625 (1983-01-01), Someshwar
patent: 4613829 (1986-09-01), Ott

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