SN54HC148, SN74HC148

8LINE TO 3LINE PRIORITY ENCODERS

SCLS109G − MARCH 1984 − REVISED APRIL 2004

1

POST OFFICE BOX 655303

(Octal)

− n-Bit Encoding

− Code Converters and Generators

description/ordering information

The ’HC148 devices feature priority decoding of

the inputs to ensure that only the highest-order

data line is encoded. These devices encode eight

data lines to 3-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.

Data inputs and outputs are active at the low logic

level.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP − N

Tube of 25

SN74HC148N

SN74HC148N

Tube of 40

SN74HC148D

−40

°C to 85°C

SOIC − D

Reel of 2500

SN74HC148DR

HC148

−40

°C to 85°C

SOIC − D

Reel of 250

SN74HC148DT

HC148

SOIC − DW

Reel of 2000

SN74HC148DWR

HC148

SOP − NS

Reel of 2000

SN74HC148NSR

HC148

CDIP − J

Tube of 25

SNJ54HC148J

SNJ54HC148J

−55

°C to 125°C

CFP − W

Tube of 150

SNJ54HC148W

SNJ54HC148W

−55 C to 125 C

LCCC − FK

Tube of 55

SNJ54HC148FK

SNJ54HC148FK

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

32 1 20 19

910 11 1213

4

5

6

7

8

18

17

16

15

14

GS

3

NC

2

1

6

7

NC

EI

A2

SN54HC148 . . . FK PACKAGE

(TOP VIEW)

NC − No internal connection

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

4

5

6

7

EI

A2

A1

GND

EO

GS

3

2

1

0

A0

SN54HC148 ...J OR W PACKAGE

SN74HC148 . . . D, DW, N, OR NS PACKAGE

(TOP VIEW)

Copyright

 2004, Texas Instruments Incorporated

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.

On products compliant to MILPRF38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.