SN74LS147N

SN74LS147, SN74LS148 10−Line−to−4−Line and 8−Line−to−3−Line Priority Encoders The SN74LS147 and the SN74LS148 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. GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage TA Operating Ambient Temperature Range 4.75 5.0 5.25 V 0 25 70 °C IOH Output Current − High IOL Output Current − Low −0.4 mA 8.0 mA http://onsemi.com LOW POWER SCHOTTKY 16 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B ORDERING INFORMATION Device Package Shipping SN74LS147N 16 Pin DIP 2000 Units/Box SN74LS147D SOIC−16 38 Units/Rail SN74LS147DR2 SOIC−16 2500/Tape & Reel SN74LS148N 16 Pin DIP 2000 Units/Box SN74LS148D SOIC−16 38 Units/Rail SN74LS148DR2 SOIC−16 2500/Tape & Reel © Semiconductor Components Industries, LLC, 2006 1 June, 2006 − Rev. 8 Publication Order Number: SN74LS147/D SN74LS147, SN74LS148 SN74LS147 (TOP ...