Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2007-06-19
2007-06-19
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
C327S333000, C327S143000, C326S057000, C326S080000
Reexamination Certificate
active
11110655
ABSTRACT:
Techniques to avoid crowbar current are provided. An integrated circuit according to an embodiment of the present invention includes a first node having a first supply voltage level. A first level shift circuit is connected between the first node and a first path. A second level shift circuit is connected between the first node and a second path. The first path includes an even number of inverter stages, while the second path includes an odd number of inverter stages. The first and second level shift circuits are configured to output a signal at the second supply voltage level. The integrated circuit also includes a PMOS transistor and an NMOS transistor connected in series between a second node having the second supply voltage level and a reference voltage. A gate of the PMOS transistor is connected to the first path, and a gate of the NMOS transistor connected to the second path. An I/O pad connected between the PMOS and NMOS transistors has high impedance during a power-on period when the second node is powered up before the first node. In other specific embodiments, the inverter stages of the first path and the second path can be replaced with pull-up or pull-down circuits, respectively.
REFERENCES:
patent: 6278294 (2001-08-01), Taniguchi
patent: 6563353 (2003-05-01), Chen et al.
patent: 6822479 (2004-11-01), Rosen
patent: 6980035 (2005-12-01), Zhou et al.
Cheng Hellen
Yu Talee
Lam Tuan T.
Semiconductor Manufacturing International (Shanghai) Corporation
Townsend and Townsend / and Crew LLP
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