EEL6323-S10-HLec024-IO-4spp

EEL6323-S10-HLec024- - Lecture 24 Input/Output(IOs Input/Output System functions Communicate between chip and external world Drive large

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1 Lecture 24: Input/Output (IOs) Input/Output System functions – Communicate between chip and external world – Drive large capacitance off chip – Operate at compatible voltage levels – Provide adequate bandwidth – Limit slew rates to control di/dt noise – Protect chip against electrostatic discharge – Use small number of pins (low cost) Signaling and Reflections Output Pads Drive large off-chip loads (2 – 50 pF) – With suitable rise/fall times – Requires chain of successively larger buffers Pad types –V DD / GND – Output – Input – Bidirectional –A n a l o g Input Pads Level conversion – Higher or lower off-chip V – May need thick oxide gates Noise filtering – Schmitt trigger – Hysteresis changes V IH , V IL A Y V DDH V DDL AY V DDL A Y weak weak A Y ESD Protection Static electricity builds up on your body – Shock delivered to a chip can fry thin gates – Must dissipate this energy in protection circuits before it reaches the gates
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This note was uploaded on 01/17/2011 for the course EEL 6323 taught by Professor Bashirullah during the Spring '08 term at University of Florida.

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EEL6323-S10-HLec024- - Lecture 24 Input/Output(IOs Input/Output System functions Communicate between chip and external world Drive large

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