758 Two Input And/Or Logic Unit



The model 758 is a high performance, eight 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, an output width control, and three outputs. A two position switch is common to all eight channels for selecting either the AND/OR logic functions.

Inhibiting of the logic unit can be accomplished in two ways. A front panel LEMO input accepts a NIM level pulse for fast simultaneous inhibiting of all eight channels. Secondly, a slow bin gate via the rear panel connector inhibits the module and is enabled or disabled from a rear panel slide switch.

Output durations are continuously variable via a front panel control over the range of 4nSec to 150nSec. The updating design permits deadtimeless operation which is desirable for fast coincidence applications at high rates.

The 758 has three high impedance, current switching outputs per channel. They are configured as one pair of double amplitude bridged outputs and one complemented NIM level. When only one output from the bridged pair is used, a double amplitude NIM pulse (-32mA) is generated, useful 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 unaffected by the loading conditions of the other outputs.

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