74LS147 Datasheet | onsemi

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 VCC TA IOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Current - High Output Current - Low Min 4.75 0 Typ 5.0 25 Max 5.25 70 - 0.4 8.0 Unit V °C m A m A http://onsemi. LOW POWER SCHOTTKY 16 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B ORDERING INFORMATION Device SN74LS147N SN74LS147D SN74LS148N SN74LS148D Package 16 Pin DIP 16 Pin 16 Pin DIP 16 Pin Shipping 2000 Units/Box 2500/Tape & Reel 2000 Units/Box 2500/Tape & Reel © Semiconductor ponents Industries, LLC, 1999 December, 1999 - Rev. 6 Publication Order Number: SN74LS147/D SN74LS147 SN74LS148 SN74LS147 (TOP VIEW) OUTPUT VCC 16 NC 15 D 14 D 4 5 1 4 2 5 6 3 6 INPUTS 7 4 7 8 5 8 C 6 C B 7 B 8 GND 3 13 3 INPUTS 2 12 2 1 11 1 9 10 9 A OUTPUT A 9 OUTPUTS SN74LS148 (TOP VIEW) OUTPUTS VCC 16 EO 15 EO 4 5 1 4 2 5 6 3 6 INPUTS 7 4 7 EI 5 E1 A2 6 A2 GS 14 GS 3 13 3 INPUTS 2 12 2 1 11 1 0 10 0 A0 A1 7 A1 8 GND OUTPUT A0 9 OUTPUTS http://onsemi. SN74LS147 SN74LS148 SN74LS147 FUNCTION TABLE INPUTS 1 H X X X X X X X X L 2 H X X X X X X X L H 3 H X X X X X X L H H 4 H X X X X X L H H H 5 H X X X X L H H H H 6 H X X X L H H H H H 7 H X X L H H H H H H 8 H X L H H H H H H H 9 H L H H H H H H H H D H L L H...