SN74LS147 SN74LS148 10-Line-to-4-Line and 8-Line-to-3-Line Priority Encoders
The SN74LS147 and the SN74LS148 are Priorit...
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 mA mA
http://onsemi.com
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 Components Industries, LLC, 1999
1
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...