© Semiconductor Components Industries, LLC, 1999

December, 1999 – Rev. 6

1

Publication Order Number:

SN74LS147/D

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

Supply Voltage

4.75

5.0

5.25

V

Operating Ambient

Temperature Range

0

25

70

°C

Output Current – High

– 0.4

mA

Output Current – Low

8.0

mA

LOW

POWER

SCHOTTKY

Device

Package

Shipping

ORDERING INFORMATION

SN74LS147N

16 Pin DIP

2000 Units/Box

SN74LS147D

16 Pin

SOIC

D SUFFIX

CASE 751B

http://onsemi.com

2500/Tape & Reel

PLASTIC

N SUFFIX

CASE 648

16

1

16

1

SN74LS148N

16 Pin DIP

SN74LS148D

16 Pin

2000 Units/Box

2500/Tape & Reel