Multiplexer hybrid used for flight data recorder (fdr) system for jaguar aircraft

摘要

Multiplexer hybrid is a two stage multiplexer constructed in the form of a hybrid microcircuit. The device having 31 inputs and 2 outputs . 27 inputs out of 31 are switched through both stages in series and an additional 4 inputs are routed directly to the second stage. 27 of these 31 inputs are available at the device interface while the remaining 4 are internally generated power supply reference, viz., OV, +5V, +15V, & - 15V, the last two being halved by potential dividers before being input to the multiplexer. Either any one of 12 pairs of inputs may be selected for switching to the output pairs, or any one of the 23 signal inputs or 4 voltage references may be selected for switching to one output while the 0 V reference is output at the second. A 6-bit address is latched into the device and is entered as two 3-bit bytes into latches with independent clocks. One latch controls the first stage of the multiplexer while the other controls the second stage. The Hybrid requires three supplies + 15V, -15V , +5V. All inputs of hybrids have overvoltage & overcurrent protection. The multiplexer hybrid is completely hermetically sealed. (Ref Fig-1).