PSpice User Guide

PSpice User Guide

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PSpice A/D User Guide Digital device modeling October 2019 390 Product Version 17.4-2019 © 2022 All Rights Reserved. Digital primitive syntax The general digital primitive format is shown below. For specific information on each primitive type see the PSpice A/D Reference Guide. Note that some digital primitives, such as pullups, do not have Timing models. See Timing model on page 395 for more information. U [( * )] + + * + + [MNTYMXDLY=] + [IO_LEVEL=] where [( * )] is the type of digital device, such as NAND, JKFF, or INV. It is followed by zero or more parameters specific to the primitive type, such as number of inputs. The number and meaning of the parameters depends on the primitive type. are the nodes used by the interface subcircuits which connect analog nodes to digital nodes or vice versa. * 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. is the name of a timing model that 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. This type of Timing model and its parameters are specific to each primitive type and are discussed in the PSpice A/D Reference Guide.

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