NAME_TABLE:

C_Function_Name: cm_d_pulldown

Spice_Model_Name: d_pulldown

Description: "digital pulldown resistor"

PORT_TABLE:

Port Name: out

Description: "output"

Direction: out

Default_Type: d

Allowed_Types: [d]

Vector: no

Vector_Bounds: -

Null_Allowed: no

PARAMETER_TABLE:

Parameter_Name: load

Description: "load value (F)"

Data_Type: real

Default_Value: 1.0e-12

Limits: -

Vector: no

Vector_Bounds: -

Null_Allowed: yes

• Description:
  The digital pulldown resistor is a device that emulates the behavior of an analog resistance value tied to a low voltage level. The pulldown may be used in conjunction with tristate buffers to provide open-collector wired or constructs, or any other logical constructs that rely on a resistive pulldown common to many tristated output devices. The model posts an input load value (in farads) based on the parameter load.

Example SPICE Usage:

a4 9 pulldown1

.model pulldown1 d_pulldown(load = 20.0e-12)