Level shifter for detecting grounded power-supply and level...

Details Level shifter for detecting grounded power-supply and level... Level shifter for detecting grounded power-supply and level...

2006-09-26

2006-09-26

Barnie, Rexford (Department: 2819)

Electronic digital logic circuitry

Interface

Logic level shifting

C326S063000, C326S080000, C326S081000, C326S082000, C326S083000, C326S086000

Reexamination Certificate

active

07112996

ABSTRACT:
A level shifter includes an input buffer, a level shifting circuit, a voltage level detecting circuit, an output buffer and a reference logic circuit. The input buffer buffers a small range input signal to output a small range signal. The level shifting circuit transforms the small range signal into a first wide range signal. The voltage level detecting circuit detects whether a power voltage of a low voltage stage is at the ground level, and prevents an indefinite logic state of the level shifter. The output buffer buffers the first wide range signal to output a second wide range signal. The reference logic circuit generates a wide range signal having a predetermined logic status when the power voltage is at the ground level. Thus, a leakage current of the level shifter is reduced.

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Rhyne (Fundamentlas of Digital Systems Design, N.J., 1973 pp. 70-71, no month.

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