Input sense circuit having selectable thresholds

Details Input sense circuit having selectable thresholds Input sense circuit having selectable thresholds

1995-02-27

1996-03-05

Cunningham, Terry

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Parallel controlled paths

327 74, 327 78, 327 81, 327391, 327437, H03K 17687

Patent

active

054971179

ABSTRACT:
A semiconductor integrated circuit comprises an input signal terminal to which an input signal is supplied from an outer unit, a plurality of input voltage sensing circuits each having a different circuit threshold value and connected to the input signal terminal, for sensing whether a voltage of the input signal is higher or lower than a predetermined normal level, a power supply voltage sensing circuit for sensing whether a power supply voltage applied from another outer unit is a normal power supply voltage or a voltage different from the normal power supply voltage, a selection circuit for selecting a corresponding one from a plurality of the input voltage sensing circuits in accordance with an output of the power supply sensing circuit, and an internal circuit to which an output of a selected one of the input voltage sensing circuits is connected.

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