74147 Priority Encoders
10-LINE-TO-4-LINEAND 8-LINE-TO-3-LINEPRIORITY ENCODERS
The SN74LS147 is Priority Encoders. it provide priority decoding of the inputs to ensure that only the highest order data line is encoded. Both devices have data inputs and outputs which are active at the low logic level.
The LS147 encodes nine data lines to four-line (8-4-2-1) BCD. The implied decimal zero condition does not require an input condition because zero is encoded when all nine data lines are at a high logic level.
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