Technical Description of an Electronic Distribution and Summing Element.

The Electronic Distribution and Summing Element EDSE consists of one 10-12 in. by 11-12 in. stitch wired circuit module. ECL 10,000 series integrated circuits provide the operating speed necessary for use of the EDSE in the Acoustic Array Simulator subsystem of the Combat System Technology Laboratory. Demonstration of EDSE performance will be made at Autonetics, and delivery will be to NUSC, New London, Conn, 120 days after receipt of contract. The use of stitch wiring assures 120 day delivery as required use of a PC board would involve a substantial schedule risk. ECL 10,000 ICs were chosen over TTL ICs for the following reasons 1 TTL is definitely too slow for some parts of the circuit at normal temperatures and for most of the circuit at elevated temperatures, 2 because of interface incompatibility, a mix of ECL and TTL components would increase the total IC count to an unacceptable level, 3 the ECL components are less susceptible to noise because of their lower input impedance, and 4 the cost difference between ECL and TTL is relatively small, and expected to decrease further.