Output buffer with improved tolerance to overvoltage

Details Output buffer with improved tolerance to overvoltage Output buffer with improved tolerance to overvoltage

1995-04-17

1996-11-19

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

326 58, 326 83, 327534, H03K 190185

Patent

active

055766358

ABSTRACT:
An output buffer with improved tolerance to overvoltage conditions. Among other features, especially when in a high-impedance state, the output buffer prevents a leakage path from a pad (108) through a pull-up driver (101) to supply voltage VDD when any voltage above VDD is placed on the pad (108). Further, the output buffer provides improved transient response characteristics. In one embodiment, the output buffer includes a pull-up driver (101), a first tracking transistor (120), a second tracking transistor (122), a voltage bias generator (112), and a coupling capacitor (124).

REFERENCES:
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patent: 5151619 (1992-09-01), Austin et al.
patent: 5160855 (1992-11-01), Dobberpuhl
patent: 5315187 (1994-05-01), Cheng
patent: 5338978 (1994-08-01), Larsen et al.
patent: 5444397 (1995-08-01), Wong et al.
patent: 5451889 (1995-09-01), Heim et al.
patent: 5467031 (1995-11-01), Nguyen et al.

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