User`s guide

7
-
8 Di
g
ital Device Modelin
g
<digital power node> <digital ground node>
are the nodes used by the interface subcircuits which
connect analog nodes to digital nodes or vice versa.
<node>*
is one or more input and output nodes. The number of nodes
depends on the primitive type and its parameters. Analog
devices, digital devices, or both may be connected to a node.
If a node has both analog and digital connections, then
PSpice A/D automatically inserts an interface subcircuit to
translate between digital output states and voltages.
<Timing Model name>
is the name of a Timing Model, which describes the device’s
timing characteristics, such as propagation delay and setup
and hold times. Each timing parameter has a minimum,
typical, and maximum value which may be selected during
analysis setup.
<I/O Model name>
is the name of an I/O Model, which describes the device’s
loading and driving characteristics. I/O Models also contain
the names of up to four DtoA and AtoD interface
subcircuits, which are automatically called by PSpice A/D
to handle analog/digital interface nodes.
MNTYMXDLY
is an optional device parameter which selects either the
minimum, typical, or maximum delay values from the
device’s Timing Model. If not specified, MNTYMXDLY
defaults to 0. Valid values are:
0 = the current value of the circuit-wide
DIGMNTYMX option (default=2)
1 = minimum
2=typical
3=maximum
4 = worst-case timing (min-max)
This type of Timin
g
Model and its
parameters are specific to each
primitive type and are discussed
in the online
MicroSim PSpice A
/
D
Reference Manual.
See Input/Output Model on
page 7-17 for more information.