Output buffer with switching PMOS drivers

Details Output buffer with switching PMOS drivers Output buffer with switching PMOS drivers

1998-12-15

2000-12-05

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327109, H03B 100

Patent

active

061572233

ABSTRACT:
An output buffer with switching PMOS drivers (10) is disclosed. According to one embodiment, output buffer (10) includes a first output driver (62) and a second output driver (68). A first output cascode (64) coupled to the first output driver (62) protects the gate oxide of the first output driver (62) from voltage changes on the output (16). A second output cascade (66) coupled to the second output driver (68) protects the gate oxide of the second output driver (68) from voltage changes on the output (16). A level shifter (30) includes multiple cascode devices (46, 48, 50, 52) and switches the first output driver (62) according to the values of a data input (12) and an enable input (14). Switching circuitry (60) coupled to the second output cascode (64) allows the first output cascode (64) to protect the gate oxide of the first output driver (62) and provides extra drive for the output buffer (10).

REFERENCES:
patent: 4962345 (1990-10-01), Crafts et al.
patent: 5939931 (1999-08-01), Noro
patent: 5995010 (1999-11-01), Blake et al.

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