Table Of Contents

Pin View Pane Drive Section

Last Modified: November 23, 2020

Use this section of the Pin View pane to specify pin driver options. A green icon Green Icon next to the Drive section indicates that the digital pattern instrument is in digital mode for the current pin when connected.

  • Termination ModeSpecifies the behavior of the pin when the pin function is set to digital and the pin state for the current cycle is not a drive state.
    • High ZSpecifies that, for non-drive pin states (L, H, X, V, M, E), the pin driver is put in a high-impedance state and the active load is disabled. This is the default setting.
    • VtermSpecifies that, for non-drive pin states (L, H, X, V, M, E), the pin driver terminates the pin to the configured VTERM voltage through a 50 Ω impedance. VTERM is adjustable to allow for the pin to terminate at a set level. This is useful for devices that might operate incorrectly if an instrument pin is unterminated and is allowed to float to any voltage level within the instrument voltage range. To address this issue, enable VTERM by configuring the VTERM pin level to the desired voltage and selecting the VTERM termination mode. Setting VTERM to 0 V and selecting the VTERM termination mode has the effect of connecting a 50 Ω termination to ground, which provides an effective 50 Ω impedance for the pin. This can be useful for improving signal integrity of certain DUTs by reducing reflections while the DUT drives the pin.
    • Active LoadSpecifies that, for non-drive pin states (L, H, X, V, M, E), the active load is connected and the instrument sources or sinks a defined amount of current to load the DUT. The amount of current sourced by the instrument and therefore sunk by the DUT is specified by IOL. The amount of current sunk by the instrument and therefore sourced by the DUT is specified by IOH. The voltage at which the instrument changes between sourcing and sinking is specified by VCOM. Configure VCOM, IOL, and IOH in the Active Load section of the pane, which expands when you select this option.
  • VTERMSpecifies the termination voltage the instrument applies during non-drive cycles when the termination mode is set to VTERM. The instrument applies the termination voltage through a 50 Ω parallel termination resistance.
  • VIHSpecifies the voltage that the instrument applies to the input of the DUT when the instrument drives a logic high (1).
  • VILSpecifies the voltage that the instrument applies to the input of the DUT when the instrument drives a logic low (0).
  • Driver Symbol — Click the box to the left of the driver symbol, as shown in the following figure, to set the control to X to terminate driving a value or to set the control to 1 or 0 to specify a value to temporarily drive. Bursting a pattern overrides this temporary setting.
    Driver Symbol
  • Enable Button — Enables the driver and disables any other active enable button. Disabling the driver puts the pin into a high-impedance state until you enable the driver, the PPMU Force Voltage mode, or the PPMU Force Current mode.
  • Clock—Enables generation of digital clock signal on the pin. Specify the clock frequency in the adjacent numeric edit box. Clock only generates the clock signal when the pin is in digital mode.

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