Dual-mode, crystal resonator/external clock, oscillator circuit

Details Dual-mode, crystal resonator/external clock, oscillator circuit Dual-mode, crystal resonator/external clock, oscillator circuit

1997-08-26

1999-05-04

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331 59, 331 74, 331108C, 331108A, 331158, 331185, 331173, H03B 506, H03B 536

Patent

active

059007877

ABSTRACT:
An oscillator circuit, having an inverter with input and output terminals interconnected through a feedback resistance, operates in two modes. In a first mode, the input and output terminals are coupled to an external crystal resonator. In a second mode, an external clock signal is supplied to the input terminal. In the second mode, the input terminal is disconnected from the output terminal, and in addition, the output-drive capacity of the inverter is reduced, or the output terminal of the inverter is held at a fixed potential.

REFERENCES:
patent: 5025230 (1991-06-01), Kondo et al.
patent: 5416445 (1995-05-01), Narahara
patent: 5453719 (1995-09-01), Narahara
patent: 5532652 (1996-07-01), Koyama et al.

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