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74LS147 Datasheet(PDF) 1 Page - Motorola, Inc |
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74LS147 Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 7 page 5-245 FAST AND LS TTL DATA 10-LINE-TO-4-LINE AND 8-LINE-TO-3-LINE PRIORITY ENCODERS The SN54 / 74LS147 and the SN54/ 74LS148 are Priority Encoders. They 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. The LS148 encodes eight data lines to three-line (4-2-1) binary (octal). By providing cascading circuitry (Enable Input EI and Enable Output EO) octal expansion is allowed without needing external circuitry. The SN54 / 74LS748 is a proprietary Motorola part incorporating a built-in deglitcher network which minimizes glitches on the GS output. The glitch occurs on the negative going transition of the EI input when data inputs 0 – 7 are at logical ones. The only dc parameter differences between the LS148 and the LS748 are that (1) Pin 10 (input 0) has a fan-in of 2 on the LS748 versus a fan-in of 1 on the LS148; (2) Pins 1, 2, 3, 4, 11, 12 and 13 (inputs 1, 2, 3, 4, 5, 6, 7) have a fan-in of 3 on the LS748 versus a fan-in of 2 on the LS148. The only ac difference is that tPHL from EI to EO is changed from 40 to 45 ns. SN54 / 74LS147 (TOP VIEW) SN54 / 74LS148 SN54 / 74LS748 (TOP VIEW) 4 5 6 7 8 C B GND D 3 2 1 9 A VCC NC 14 13 12 11 10 9 1 2 3 4 5 6 7 16 15 8 D 3 2 1 9 A 4 5 6 7 8 C B OUTPUT INPUTS OUTPUT INPUTS OUTPUTS 4 5 6 7 E1 A2 A1 GND VCC EO GS 3 2 1 0 A0 14 13 12 11 10 9 1 2 3 4 5 6 7 16 15 8 EO GS 3 2 1 0 A0 4 5 6 7 EI A2 A1 OUTPUTS INPUTS OUTPUT INPUTS OUTPUTS SN54/74LS147 SN54/74LS148 SN54/74LS748 10-LINE-TO-4-LINE AND 8-LINE-TO-3-LINE PRIORITY ENCODERS LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 N SUFFIX PLASTIC CASE 648-08 16 1 16 1 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXD SOIC 16 1 D SUFFIX SOIC CASE 751B-03 |
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