NAME_TABLE:

C_Function_Name: cm_d_nand

Spice_Model_Name: d_nand

Description: "digital `nand' gate"

PORT_TABLE:

Port Name: in out

Description: "input" "output"

Direction: in out

Default_Type: d d

Allowed_Types: [d] [d]

Vector: yes no

Vector_Bounds: [2 -] -

Null_Allowed: no no

PARAMETER_TABLE:

Parameter_Name: rise_delay fall_delay

Description: "rise delay" "fall delay"

Data_Type: real real

Default_Value: 1.0e-9 1.0e-9

Limits: [1.0e-12 -] [1.0e-12 -]

Vector: no no

Vector_Bounds: - -

Null_Allowed: yes yes

PARAMETER_TABLE:

Parameter_Name: input_load

Description: "input load value (F)"

Data_Type: real

Default_Value: 1.0e-12

Limits: -

Vector: no

Vector_Bounds: -

Null_Allowed: yes

• Description:
  The digital nand gate is an n-input, single-output nand gate that produces an active `0' value if and only if all of its inputs are `1' values. If ANY of the inputs is a `0', the output will be a `1'; if neither of these conditions holds, the output will be unknown. The delays associated with an output rise and those associated with an output fall may be specified independently. The model also posts an input load value (in farads) based on the parameter input load. The output of this model does not, however, respond to the total loading it sees on its output; it will always drive the output strongly with the specified delays.

Example SPICE Usage:

a6 [1 2 3] 8 nand1

.model nand1 d_nand(rise_delay = 0.5e-9 fall_delay = 0.3e-9

+ input_load = 0.5e-12)