A SIX INPUTS PROGRAMMABLE TRIGGER LOGICAL CIRCUIT

Abstract：

A Six Inputs Programmable Trigger Logical Circuit (NIM Standard) has beendeveloped using a ECL fully decoded random access memory (RAM) E855 64×1.This circuit can realize various logical functions of the inputs N≤6. While varyinglogical conbinations of the inputs, what is required is only loading the memories againand without hardware or link modifications. It can replace the logical NIM circuitsof the inputs N≤6 which ape used in the on-line experiments of the high energyphysics. Based on this principle, it can be expected to develop a low prices, facile andlarge scale trigger logical system in order to satisfy the requirements of the high energyphysics counter experiments. In this circuit the input signal is standard NIM level with the pulse width≥4 ns.The output signal is also standard NIM level. The output can supply 32 mA currentand connect two 50 Ω loads to form the bridge output. The circuit works with both strobeand no strobe format.