Each input channel‘s load may be configured as a selectable resistor with pull-up and pull-down values. The resistive load is useful in applications with very low DUT output swings (where a traditional active load will not switch on and off completely or quickly) and also as a means of forcing the DUT to a known voltage when the DUT is in a Hi-Z state. When the resistive load is applied to a UUT the Hi-Z state, the DIO input maintains a low leakage current when the UUT input voltage is between the VCC and VEE supply values. The following are the resistive load options:
Pull-up |
Pull-down |
Open (Hi-Z) |
Open (Hi-Z) |
250 Ohm |
250 Ohm |
1 K Ohm |
1 K Ohm |
240 Ohm |
240 Ohm |
The input channel’s pull-up and pull down resistive loads can be read back and set dynamically at any time even when the DIO is in its running state.