REI Datasheet
SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148, SN74LS147, SN74LS148
10-Line to 4-Line and 8-Line to 3-Line Priority Encoders
These TTL encoders feature priority decoding of the inputs to ensure that only the highest-order data line
is encoded. The ‘147 and ‘LS147 encode nine data lines to four-line (8-4-2-1) BCD. The implied decimal
zero condition requires no input condition as zero is encoded when all nine data lines are at a high logic
level. The ‘148 and ‘LS148 encode eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry
(enable input EI and enable output EO) has been provided to allow octal expansion without the need
for external circuitry. For all types, data inputs and outputs are active at the low logic level. All inputs are
buffered to represent one normalized Series 54/74 or 54LS/74LS load, respectively.
Rochester Electronics
Manufactured Components
Rochester branded components are
manufactured using either die/wafers
purchased from the original suppliers
or Rochester wafers recreated from the
original IP. All recreations are done with
the approval of the OCM.
Parts are tested using original factory
test programs or Rochester developed
test solutions to guarantee product
meets or exceeds the OCM data sheet.
Quality Overview
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ISO-9001
AS9120 certification
Qualified Manufacturers List (QML) MIL-PRF-38535
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Class Q Military
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Class V Space Level
Qualified Suppliers List of Distributors (QSLD)
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Rochester is a critical supplier to DLA and
meets all industry and DLA standards.
Rochester Electronics, LLC is committed to supplying
products that satisfy customer expectations for
quality and are equal to those originally supplied by
industry manufacturers.
The original manufacturer’s datasheet accompanying this document reflects the performance
and specifications of the Rochester manufactured version of this device. Rochester Electronics
guarantees the performance of its semiconductor products to the original OEM specifications.
‘Typical’ values are for reference purposes only. Certain minimum or maximum ratings may be
based on product characterization, design, simulation, or sample testing.
© 2013 Rochester Electronics, LLC. All Rights Reserved 11212013
To learn more, please visit
www.rocelec.com
SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS
SDLS053A – OCTOBER 1976 – REVISED FEBRUARY 2001
D
D
’147, ’LS147
Encodes 10-Line Decimal to 4-Line BCD
Applications Include:
– Keyboard Encoding
– Range Selection
’148, ’LS148
Encodes 8 Data Lines to 3-Line Binary
(Octal)
Applications Include:
– N-Bit Encoding
– Code Converters and Generators
D
D
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
2001, Texas Instruments Incorporated
POST OFFICE BOX 655303
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DALLAS, TEXAS 75265
1
SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS
SDLS053A – OCTOBER 1976 – REVISED FEBRUARY 2001
schematics of inputs and outputs
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
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