CMOS bidirectional buffer for mixed voltage applications

Details CMOS bidirectional buffer for mixed voltage applications CMOS bidirectional buffer for mixed voltage applications

1997-09-02

1999-06-29

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327390, 327437, 327589, H03K 300

Patent

active

059173483

ABSTRACT:
In a preferred embodiment of the present invention, a bidirectional buffer connects a first device, such as a CMOS chip having a first voltage, such as VCC, to a second device having a second voltage, such as VDD, through a terminal pad. The buffer includes a bootstrap capacitor to assist in driving up the terminal pad. In particular, the buffer comprises an output and an input portion. The output portion includes a first driver for driving the terminal pad up to VDD and a second driver for driving the terminal pad down to VSS. The first driver includes a pull-up PMOS transistor and a pull-up NMOS transistor connected in series and the second driver includes a pull-down NMOS transistor. Further, preferably one pair of push-pull bootstrap control transistors are connected in parallel to the gate of the pull-up NMOS transistor for quickly driving up the first driver to a voltage level based on the bootstrap capacitor having a predetermined capacitance. The input portion includes an invertor and a protection resistor for protecting the invertor from static charges.

REFERENCES:
patent: 4491748 (1985-01-01), Chappell et al.
patent: 4859870 (1989-08-01), Wong et al.
patent: 5128563 (1992-07-01), Hush et al.
patent: 5557229 (1996-09-01), Eitan
patent: 5604454 (1997-02-01), Maguire et al.

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