Isolation cell used as an interface from a circuit portion...

Details Isolation cell used as an interface from a circuit portion... Isolation cell used as an interface from a circuit portion...

2007-01-23

2007-01-23

Chang, Daniel D. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

C326S062000, C326S082000

Reexamination Certificate

active

10908307

ABSTRACT:
An isolation cell provided between a first module (which can operate in either a power-up mode or a power down mode) and a second module. According to an aspect of the present invention, the isolation cell can be located to operate drawing power from either the first module or the second module without a floating node in the power-down mode of the first module. Due to the absence of the floating nodes, unneeded power drain is reduced/avoided. In one embodiment, a switch operates to connect power to a series of pair of inverters (propagating the signal from the first module to the second module) when the first module is in power-up mode and disconnects the power in the power-down mode.

REFERENCES:
patent: 6970032 (2005-11-01), Smith et al.

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