Part # 74LS147 datasheet

Part Manufacturer: Motorola

Motorola

Part Description: 74LS147


Part Details:

SN54/74LS147 10-LINE-TO-4-LINE SN54/74LS148 AND 8-LINE-TO-3-LINE SN54/74LS748 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 10-LINE-TO-4-LINE data line is encoded. Both devices have data inputs and outputs which are AND 8-LINE-TO-3-LINE active at the low logic level. PRIORITY ENCODERS 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 LOW POWER SCHOTTKY 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) octalexpansion is allowed without needing external circuitry. The SN54 / 74LS748 is a proprietary Motorola part incorporating a built-in J SUFFIX deglitcher network which minimizes glitches on the GS output. The glitch CERAMIC occurs on the negative going transition of the EI input when data inputs 0 ­ 7 CASE 620-09 are at logical ones. 16 The only dc parameter differences between the LS148 and the LS748 are 1 that (1) Pin 10 (input 0) has a fan-in of 2 on the LS748 versus a fan-in of 1 onthe LS148; (2) Pins 1, 2, 3, 4, 11, 12 and 13 (inputs 1, 2, 3, 4, 5, 6, 7) have afan-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 N SUFFIX 45 ns. PLASTIC CASE 648-08 SN54 / 74LS147 16 (TOP VIEW) 1 OUTPUT INPUTS OUTPUT V D 3 2 1 9 A CC NC D SUFFIX 16 15 14


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74LS147.pdf Datasheet