Logic level shifter with power on control

Details Logic level shifter with power on control Logic level shifter with power on control

1995-12-07

1997-09-23

Hudspeth, David R.

Electronic digital logic circuitry

Interface

Supply voltage level shifting

326 33, 326 68, H03K 190185

Patent

active

056696841

ABSTRACT:
Logic level shifter for coupling a first logic circuit having a first voltage level power supply to a second logic circuit with the shifter and the second logic circuit having a second voltage level power supply and with the second voltage level supply applied at a time when the first level voltage supply is not applied. The level shifter maintains its outputs at either a reference ground voltage or the second level voltage when the second level voltage supply is present and the first level voltage supply is not present.

REFERENCES:
patent: 4486670 (1984-12-01), Chan et al.
patent: 4490633 (1984-12-01), Noufer et al.
patent: 4978870 (1990-12-01), Chen et al.
patent: 5113097 (1992-05-01), Lee
patent: 5136190 (1992-08-01), Chern et al.
patent: 5223751 (1993-06-01), Simmons et al.
patent: 5406140 (1995-04-01), Wert et al.
patent: 5422523 (1995-06-01), Roberts et al.
patent: 5583454 (1996-12-01), Hawkins et al.

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