The AD53041 is a complete, high speed, current switching load designed for use in linear, digital or mixed signal test systems. Combining a high speed monolithic process with a unique surface mount package, this product attains superb electrical performance while preserving optimum packaging densities in an ultrasmall 20-lead, PSOP package with a built-in heatsink. Featuring current programmability of up to 50 mA, the AD53041 is designed to force the device under test to source or sink the programmed IOH and IOL currents. IOH and IOL currents are determined by applying a corresponding voltage (5 V = 50 mA, 16 mA, 5 mA) to the IOHPGM and IOLPGM pins. The voltage-to-current conversion is performed within the AD53041, thus allowing the current levels to be set by a standard voltage out digital-to-analog converter. The AD53041 transition from IOH to IOL occurs when the output voltage of the device under test slews above or below the programmed threshold or commutation voltage. The commutation voltage is programmable from 2 V to +7 V, covering the large spectrum of logic devices while able to support the large current specifications (48 mA) typically associated with line drivers. To test I/O devices, the active load can be switched into a high impedance state (Inhibit Mode), electrically removing the active load from the path through the Inhibit Mode feature. The active load leakage current in Inhibit is typically 100 nA. The Inhibit input circuitry is implemented using high speed differential inputs with a common-mode voltage range of 2 V to +3 V and a maximum differential voltage of 3 V. This allows for direct interface to precision differential ECL timing or the simplicity of switching active load from a single ended TTL or CMOS logic source. With switching speeds from IOH or IOL into Inhibit of less than 2.0 ns, the AD53041 can be electrically removed from the signal path "on the fly."