HD74HC149 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

MFG CO.

HD74HC149

8-to-8-line Priority Encoder

Hitachi -> Renesas Electronics 

HD74HC149

Function Table

Inputs

0 12 3 4 56 7 E

X XX X X XX X H

H HH H H HH H L

X XX X X XX L L

X XX X X XL HL

X XX X X L HHL

X XX X L HH H L

X XX L H HH H L

X XL H H HH H L

X L H H H HH H L

L HH H H HH H L

H : High level

L : Low level

X : Irrelevant

Outputs

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 P

H HH H HH H H H

H HH H HH H H H

H HH H HH H L L

H HH H HH L H L

H HH H HL H H L

H HH H L H H H L

H HH L HH H H L

H HL H HH H H L

H L H H HH H H L

L HH H HH H H L

Pin Arrangement

01

12

23

34

Inputs 4 5

56

67

78

E9

GND 10

(Top view)

20 VCC

19 Y0

18 Y1

17 Y2

16 Y3

15 Y4 Outputs

14 Y5

13 Y6

12 Y7

11 P

2

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