Digital Logic Fundamentals Unit 7 – Tri-State Output
NEW TERMS AND WORDS
tri-state - a gate that has a high impedance (high-Z) output state in addition to logic 0 and logic 1
output states.
high-Z state - the output state of a tri-state device when it is disabled; the output state is neither
logic 1 or logic 0. High-Z means high impedance.
bus - conductors that are used as a path for the transfer of data between devices in a computer.
source - a device is a source of current when current flows from the device to a load.
sink - a device is a sink for current when current flows from a load through the device to ground.
totem pole - the configuration of two output transistors of a gate. The emitter of the top transistor
connects to the collector of the bottom transistor; the gate output is at the emitter/collector
connection point.
EQUIPMENT REQUIRED
F.A.C.E.T. base unit
DIGITAL LOGIC FUNDAMENTALS circuit board
Multimeter
Oscilloscope, dual trace