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74F14 データシート(PDF) 2 Page - NXP Semiconductors |
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74F14 データシート(HTML) 2 Page - NXP Semiconductors |
2 / 10 page Philips Semiconductors Product specification 74F148 8-input priority encoder 2 March 1, 1990 853–0345 98994 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 16 15 14 13 12 11 10 7 6 5 4 3 2 1 A1 VCC I2 I1 I0 I3 EO GS I4 I5 A2 I6 I7 EI 9 8 GND A0 SF00181 TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74F148 6.0ns 23mA ORDERING INFORMATION DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C PKG DWG # 16-pin plastic DIP N74F148N SOT38-4 16-pin plastic SO N74F148D SOT109-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW I1 – I7 Priority inputs (active Low) 1.0/2.0 20 µA/1.2mA I0 Priority input (active Low) 1.0/1.0 20 µA/0.6mA EI Enable input (active Low) 1.0/2.0 20 µA/1.2mA EO Enable output (active Low) 50/33 1.0mA/20mA GS Group select output (active Low) 50/33 1.0mA/20mA A0 – A2 Address outputs (active Low) 50/33 1.0mA/20mA NOTE: One (1.0) FAST unit load is defined as: 20 µA in the High state and 0.6mA in the Low state. |
同様の部品番号 - 74F14 |
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同様の説明 - 74F14 |
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