1. Tri-state Buffers and Drivers By Taweesak Reungpeerakul
Chapter 10
Tri-state Buffers and Drivers
By Taweesak Reungpeerakul
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2. Contents
Introduction
Tri-state Buffers
Line Drivers
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3. 10.1 Introduction Tri-state buffers VLSI and Microprocessor
3-state: Logic 0, 1, or Hi-Z (disconnect)
Line Drivers
Bus interface with memory, microprocessor, and communication systems
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4. 10.2 Tri-state Buffers Tri-state: Hi-Z
to allow multiple circuits to share the same output line or bus
to monitor signals without affecting the signal
often provides voltage or current amplification
to reduce the number of wires
often used in the data and address bus lines of microprocessors
Hi-Z
to disconnect the pin from its influence on the circuit
to prevent short circuits
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5. Truth Table and Symbols
Input
A B
Output C Z 1 Or
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6. Switching with a Tri-state Buffer
IC: 74XX125
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7. Bus Working
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8. IC
74XX240
74XX241
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