Interface circuit between different potential levels

Details Interface circuit between different potential levels Interface circuit between different potential levels

1997-02-25

1999-10-05

Santamauro, Jon

Electronic digital logic circuitry

Interface

Supply voltage level shifting

326 83, 326 86, H03K 190185

Patent

active

059630558

ABSTRACT:
A semiconductor output circuit serves as an interface circuit between LSIs having a high and a low supply voltages. The output circuit has at least a pre-buffer and an output stage circuit. The output stage circuit has a pull-up n-channel transistor arranged between an output pad and a low-voltage power source. The output pad may receive a high voltage from an external circuit, or the LSI operating with high supply voltage. The pre-buffer applies a voltage in the range of a ground voltage and a high voltage to the gate of the pull-up transistor, to turn on and off the pull-up transistor. The output stage circuit further has a reverse current prevention circuit formed between and connected to the low-voltage power source and the pull-up transistor, to block a reverse current flowing from the output pad to the low-voltage power source when the high voltage is applied to the output pad.

REFERENCES:
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patent: 5635861 (1997-06-01), Chan et al.
patent: 5721508 (1998-02-01), Rees
patent: 5729157 (1998-03-01), Monk et al.

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