 Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1 Publication Order Number:
SN74LS147/D
C0083C0078C0055C0052C0076C0083C0049C0052C0055 C0083C0078C0055C0052C0076C0083C0049C0052C0056
C0049C0048C0045C0076C0105C0110C0101C0045C0116C0111C0045C0052C0045C0076C0105C0110C0101
C0097C0110C0100 C0056C0045C0076C0105C0110C0101C0045C0116C0111C0045C0051C0045C0076C0105C0110C0101
C0080C0114C0105C0111C0114C0105C0116C0121 C0069C0110C0099C0111C0100C0101C0114C0115
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
V
CC
Supply Voltage 4.75 5.0 5.25 V
T
A
Operating Ambient
Temperature Range
0 25 70 °C
I
OH
Output Current – High –0.4 mA
I
OL
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