Large loading split I/O driver with negligible crowbar

Details Large loading split I/O driver with negligible crowbar Large loading split I/O driver with negligible crowbar

2008-01-08

2008-01-08

Barnie, Rexford (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S081000, C326S086000, C326S087000, C327S109000, C327S333000

Reexamination Certificate

active

07317333

ABSTRACT:
A pre-driver for large I/O pull-up and pull-down transistors is provided so that the I/O pull-up and pull-down transistors do not experience crowbar current, and the pre-driver circuit likewise does not experience crowbar current or require large driver transistors. One pre-driver circuit includes two NAND gates and two NOR gates with delay circuitry provided by two series inverters from a data input to a first node, and two additional series inverters from the first node to a second node. A further pre-driver circuit includes feedback from the pre-driver outputs to ensure its NMOS and PMOS transistors do not turn on together to create crowbar, while allowing faster switching. With the pre-driver circuit embodiments, a conventional level shifter can be used. Further with the pre-driver circuitry, slew rate control can be provided in the pull-up and pull-down driver circuitry, rather than in the pre-driver circuitry.

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patent: 2005/0024090 (2005-02-01), Terletzki et al.
Rhyne Fundamentals of Digital System Design, 1973, N.J., pp. 70-71.

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