Valentine's Day, 2000

Gates revisted


Basic logic gates

Properties of gates

Logic levels

Noise margins

This is just an example

Fan out

Number of input gates that can be driven be an output while maintaining voltage levels.

Current sink
Current that can be driven low (100 µA)
Current source
Current that can be driven high (10 µA)

Power dissipation

Propagation delay

How long does it take a gate to do its job?

MOS

MOS
metal-oxide-semiconductor
CMOS
complementary MOS
FET
field-effect transistor

CMOS offers low power, high fan-out, good integration.
CMOS gate implementation

Integrated circuits