Basic TTL Tri-State Buffer Circuit Example 1
This is an example tri-state buffer circuit. The output is turned on-off based on the logic level on the enable pin.
Note the truth table in Fig. 2 below.
Another variation is Basic TTL Tri-State Buffer Circuit Example 2. This differs in that we eliminated the SN74LS02 circuit. We can use a ingle IC instead of three differing ICs.
The two are functionally identical
Tri-State switch truth table. This illustrates a non-inverting output.
When the enable pin (EN) is LOW the output is floating.
Pin diagram SN74LS00 quad 2-input NAND gates.
SN74LS02 quad 2-input NOR gates pin connections.
SN74LS04 internal diagram.
Fig. 6 H-bridge motor control based on tri-state switches.
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