74F148

INTEGRATED CIRCUITS 74F148 8-input priority encoder Product specification IC15 Data Handbook 1990 Mar 01 Philips Semiconductors Philips Semiconductors Product specification 8-input priority encoder 74F148 FEATURES Code conversions Multi-channel D/A converter Decimal-to-BCD converter Cascading for priority encoding of “N” bits Input enable capability Priority encoding-automatic selection of highest priority input line Output enable-active Low when all inputs are High Group signal output-active when any input is Low DESCRIPTION The 74F148 8-input priority encoder accepts data from eight active-Low inputs and provides a binary representation on the three active-Low outputs. A priority is assigned to each input so that when two or more inputs are simultaneously active, the input with the highest priority is represented on the output, with input line I7 having the highest priority. A High on the Enable Input (EI) will force all outputs to the inactive (High) state and allow new data to settle without producing erroneous information at the outputs. A Group Signal (GS) output and an Enable Output (EO) are provided with the three data outputs. The GS is active-Low when any input is Low: this indicates when any input is active. The EO is active-Low when all inputs are High. Using the Enable Output along with the Enable Input allows priority encoding of N input signals. Both EO and GS are active-High when the Enable Input is High. PIN CONFIGURATION I4 I5 I6 I7 ...