The model 756 logic unit contains four channels of four input logic with veto in a single width NIM module. Logic AND, OR, Majority logic, Fan-in/Fan-out, and Anti-coincidence functions can be performed with this versatile module. All functions are direct coupled and operate with input overlap times as narrow as 1nSec.
Each channel has four logic inputs, an anti-coincidence input, a coincidence level switch, and five outputs. The inputs are enabled by connecting the input cable to the desired input, eliminating errors often occurring with switched inputs. The setting of the coincidence level switch then determines whether a logic, OR, AND, or Majority logic function will produce an output.
After the inputs have satisfied the logic function desired, triggering of a regenerative stage produces a standardized output pulse for the three updating outputs, variable from 4nSec to 1µSec, independent of the input pulse shapes or overlap times. The two overlap outputs bypass the regenerative stage and produce output widths equal to the input overlap time. This permits outputs up to the maximum input rate capability of 1nSec width and 300 MHz rate.
The outputs are the current source type with two pairs of negative bridged outputs and one complement for each channel. When only one output of a bridged pair is used, a double-amplitude NIM pulse (-32mA) is generated for driving long cables with narrow pulse widths. The outputs have transition times of typically 1nSec, and their shapes are virtually unaffected by the loading conditions of the other outputs.
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