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SN74LS147 Datasheet

Priority Encoders

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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
8.0
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
Package
Shipping
SN74LS147N
16 Pin DIP 2000 Units/Box
SN74LS147D
SOIC16
38 Units/Rail
SN74LS147DR2
SOIC16 2500/Tape & Reel
SN74LS148N
16 Pin DIP 2000 Units/Box
SN74LS148D
SOIC16
38 Units/Rail
SN74LS148DR2
SOIC16 2500/Tape & Reel
© Semiconductor Components Industries, LLC, 2006
June, 2006 Rev. 8
1
Publication Order Number:
SN74LS147/D


  ON Semiconductor Electronic Components Datasheet  

SN74LS147 Datasheet

Priority Encoders

No Preview Available !

SN74LS147, SN74LS148
SN74LS147
(TOP VIEW)
OUTPUT
INPUTS
VCC NC D 3 2 1
16 15 14 13 12 11
OUTPUT
9A
10 9
D321 9
4A
5 6 7 8C B
1 2 3 4 56 78
4 5 6 7 8 C B GND
INPUTS
OUTPUTS
SN74LS148
(TOP VIEW)
OUTPUTS
INPUTS
VCC EO GS 3 2 1
16 15 14 13 12 11
OUTPUT
0 A0
10 9
EO GS 3 2 1 0
4 A0
5 6 7 EI A2 A1
1 2 3 4 56 78
4 5 6 7 E1 A2 A1 GND
INPUTS
OUTPUTS
http://onsemi.com
2


Part Number SN74LS147
Description Priority Encoders
Maker ON Semiconductor
Total Page 7 Pages
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