Method of making a CMOS output pad driver with variable drive cu

Details Method of making a CMOS output pad driver with variable drive cu Method of making a CMOS output pad driver with variable drive cu

1995-03-28

1996-08-20

Tsai, H. Jey

Fishing, trapping, and vermin destroying

437 60, 437250, 437948, H01L 2170, H01L 2700

Patent

active

055478875

ABSTRACT:
A configurable circuit for driving an integrated circuit output pad includes two differently-sized arrays of p-channel FETs and two arrays of differently-sized n-channel FETs for driving the pad. A circuit designer selects different ones of the FETs to produce a desired level of n-channel and p-channel drive at the pad. The nonselected p-channel FETs are maintained in a disabled condition by tieing them off to one side of a p-channel FET which is also connected to a n-type island in a substrate in which the circuit is formed. Electrostatic charge is drained from the gates of the disabled FETs through the n-type island when power is not applied to the integrated circuit thereby preventing failure of leakage tests. The nonselected n-channel FETs are similarly tied to one side of an n-channel FET which in turn is tied to a p-type island to achieve the same purpose for the n-channel FETs. A photolithographic mask embodying a configurable circuit is provided to a designer who utilizes a CAD program to lay down polysilicon connections to select the drive transistors and disable the nonselected transistors.

REFERENCES:
patent: 4893168 (1990-01-01), Takahashi et al.
patent: 5290724 (1994-03-01), Leach
patent: 5399517 (1995-03-01), Ashtaputre et al.

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