Input_Output-1

Input_Output-1 - ECE 6130/4130: Advance VLSI Systems Fall...

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1 ECE 6130/4130: Advance VLSI Systems Fall 2009 I/O and Packaging Prof. Saibal Mukhopadhyay School of Electrical & Computer Engineering Georgia Institute of Technology
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2 Reading Materials Chapter 14: Introduction to VLSI Circuits and Systems , Uyemura, Lecture notes (posted in T-square, under “Resources/Lecture Slides”) Chapters 2, 9: Digital Integrated Circuits: A Design Perspectives, J. M. Rabaey, A. Chandrakasan, B. Nikolic
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3 I/O Circuits Communicate with the ‘outside’ world Input – need to ensure protection against electrostatic discharge Prevent false switching at the input Output – Need to drive large capacitance Energy dissipation can be high
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4 Input/Output port types.
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5 Input Circuit: ESD Protection When a chip is connected to a board, there is unknown (potentially large) static voltage difference Equalizing potentials requires (large) charge flow through the pads Can damage the MOS transistors ox G t V E
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6 Diode characteristics.
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7 ESD Protection Diode PAD V DD R D 1 D 2 X C PAD Buffer P+ & N+ Diffusion Resistors = 200 3k Ohm
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8 Input Circuit: Prevention of False Switching S chmitt Trigger Page 554: Uyemura
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9 Noise Suppression using Schmitt Trigger
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This note was uploaded on 12/14/2009 for the course ECE 6130 taught by Professor Staff during the Fall '08 term at Georgia Tech.

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Input_Output-1 - ECE 6130/4130: Advance VLSI Systems Fall...

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