Tri-State Buffer

In this topic:

Netlist entry

Axxxx in enable out model_name

Connection details

Name	Description	Flow	Type
in	Input	in	d
enable	Enable	in	d
out	Output	out	d

Model format

.MODEL model_name d_tristate parameters

Model parameters

Name	Description	Type	Default	Limits
delay	Delay	real	1nS	???MATH???1\text{e}^{-12} - \infty???MATH???
input_load	Input load value (F)	real	1pF	none
enable_load	Enable load value (F)	real	1pF	none
family	Logic family	string	UNIV	none
in_family	Input logic family	string	UNIV	none
out_family	Output logic family	string	UNIV	none
out_res	Digital output resistance	real	100	???MATH???0 - \infty???MATH???
out_res_pos	Digital output res. pos. slope	real	out_res	???MATH???0 - \infty???MATH???
out_res_neg	Digital output res. neg. slope	real	out_res	???MATH???0 - \infty???MATH???
min_sink	Minimum sink current	real	-0.001	none
max_source	Maximum source current	real	0.001	none
sink_current	Input sink current	real	0	none
source_current	Input source current	real	0	none

Device Operation

This is a three terminal buffer device. The output state is equal to the input state and the output strength is determined by the enable input as follows:

Enable	Output Strength
0	HI-IMPEDANCE
1	STRONG
UNKNOWN	UNDETERMINED

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