752 Two Input And/Or Logic Unit



The model 752 is a high-performance, four channel, two-input logic unit packaged in a single width NIM module. It performs logical AND, OR, fan-in and fan-out functions.

Each channel has two logic inputs, a two position switch for selecting the logic function desired, an output width control, and six outputs. A fast veto is common to all four channels which permits anti-coincidence decisions. In addition, a bin gate applied via the rear panel connector inhibits the entire module and is enabled or disabled from a rear panel slide switch. After the inputs have satisfied the logic function desired, triggering of an updating regenerative stage produces a standardized output pulse, independent of the input pulse shapes or overlap times. Output durations are continuously variable over the range of 4nSec to 1µSec. The updating design ensures deadtimeless operation, while the double-pulse resolution is 6.5nSec for fast counting applications.

The 752 has six high-impedance current switching outputs per channel. They are configured as two pairs of double-amplitude bridged outputs and two complemented NIM levels. When only one output from the bridged pair is used, a double-amplitude NIM pulse (-32mA) is generated for driving long cables with narrow pulse widths. Two normal NIM levels are produced when both of the bridged outputs operate into 50 ohm loads. The output risetimes and falltimes are typically 1.5nSec, and their shapes are virtually unaffected by the loading conditions of the other outputs.

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