Specifications

104 Chapter 6—Primitive Devices
Three–State Buffer
The three–state buffer has N data inputs, N data outputs, and an optional
active–low enable input. If the enable input exists and is high, all outputs
enter a High Impedance state. If the enable input doesn’t exist or is low,
each output will follow the corresponding input if it is low or high, or pro-
duce a Don’t Know level otherwise.
NOTE: N is a placeholder. The limits on N differ depending on the device. See
Appendix A for more detail.
A single–input three–state buffer is shown in the following table:
Enable Data Out
000
011
10Z
11Z
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