Data output impedance control

Details Data output impedance control Data output impedance control

1995-04-12

1997-12-30

Karlsen, Ernest F.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

371 225, G01R 3128

Patent

active

057034958

ABSTRACT:
The present invention provides an apparatus and method for monitoring the functioning of a special operational mode on an integrated circuit module without the need for a special or dedicated pin. By monitoring the data output pins of the module operation in a special operational mode and premature interruption thereof, is detected. Delayed transition from a state of low impedance to a state of high impedance during the data output cycle is indicative of the special operational mode. The modules which usually have tri-state devices on their output lines are provided with delay circuitry to delay the transition of the tri-state device, during the data output cycle, from a state of low impedance to a state of high impedance while the device remains in a special operating mode.

REFERENCES:
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patent: 5111433 (1992-05-01), Miyamoto
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patent: 5157630 (1992-10-01), Suwa et al.
patent: 5177745 (1993-01-01), Rozman
patent: 5265100 (1993-11-01), McClure et al.

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