I/O buffer with variable conductivity

Details I/O buffer with variable conductivity I/O buffer with variable conductivity

2005-01-04

2005-01-04

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S057000, C326S112000, C326S119000, C326S121000

Reexamination Certificate

active

06838906

ABSTRACT:
A driver structure for an I/O buffer circuit is disclosed. The driver structure includes a pre-push-pull driver and a post-push-pull driver. A delay circuit along is connected in series between the input signals of the pre-push-pull driver and the post-push-pull driver. After a delay time following a transition of the input signal, the circuit operation of the post-push-pull driver is turned off before the amplitude of the output signal reaches its maximum overshooting. This changes the output conductivity to inhibit the overshooting in the output signal, preventing power bounce and ground bounce at the receiving end.

REFERENCES:
patent: 6025738 (2000-02-01), Masleid
patent: 6066958 (2000-05-01), Taniguchi et al.
patent: 6236234 (2001-05-01), Yagi
patent: 6236237 (2001-05-01), Wong et al.
patent: 6351148 (2002-02-01), Lee
patent: 6535020 (2003-03-01), Yin
patent: 6608505 (2003-08-01), Tsuji

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