Latched multiplexer for stabilizing the switch crystal to ring o

Details Latched multiplexer for stabilizing the switch crystal to ring o Latched multiplexer for stabilizing the switch crystal to ring o

1990-08-13

1992-03-17

Mis, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

331 49, H03K 19003

Patent

active

050971549

ABSTRACT:
An adjunct chip, usable as a peripheral to a microprocessor, which detects power failure, and which puts the microprocessor into a known state upon power down. In order to reliably and stably put the microprocessor into a known state, several clocks are generated after the reset signal. However, since the power supply is falling, it is possible that the crystal-controlled oscillator may already have become unreliable. Therefore, a simple logic circuit (a ring oscillator, in the presently preferred embodiment) is used to generate the needed additional clocks at power-down. The switch from crystal-controlled oscillator to ring oscillator is stabilized by using a latched multiplexer to switch between the two oscillator inputs. The latch adds hysteresis to the switching characteristic, avoiding any problems of switching jitter.

REFERENCES:
patent: 4816776 (1989-03-01), Kessler

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