Each channel of the 622 provides five NIM-level current source outputs and one complementary output. This high fan-out is achieved by means of an output circuit design that minimizes quiescent power. Their long-term stability is excellent, permitting their direct use in subsequent coincidence applications without any need for external clipping cables. Risetimes and falltimes are less than 2.5 ns except on the single negative and complementary outputs, where they are typically less than 1.5 ns. The single 621AL input was replaced by two summed inputs, and the 621AL threshold control pot was replaced by a two-position switch, which selects one of two threshold levels corresponding to either an AND or an OR requirement of the two inputs.
Output falltimes slightly longer on wide output durations.
Other characteristics same as for Fast Negative Timing Output. Less than 9 ns at minimum output width setting. 9.5 ns typical.