The GX5960 digital subsystem represents the highest level of performance available for PXI-based digital instrumentation. The GX5960 series includes two types of cards: GX5961 and GX5964/GX5964A. The GX5960 series offers high performance pin electronics and a timing generator / sequencer in a compact, 6U PXI form factor. The GX5960 digital subsystem consists of one GX5961 Clock/ Trigger board with 16 driver / sensor channels and 32 static high voltage open collector utility I/O channels; and one or more GX5964 driver / sensor boards, with each board supporting 32 bi-directional I/O channels. Up to 528 digital I/O channels can be supported by the GX5960 digital subsystem. Each digital channel features a wide drive / sense voltage range of -14 V to +25V (maximum swing of 24 volts) which can be individually programmed for a drive hi, drive lo, sense hi, sense lo, and a load value (with commutation voltage level) – offering the user complete flexibility when creating test programs and fixtures for multiple types of UUTs. In addition, each channel offers a parametric measurement unit (PMU) for DC measurements as well as hybrid pin switching capability for the routing of external analog instrumentation to each instrument channel.