HCC4532B Datasheet, PDF (8/15 Pages) STMicroelectronics – 8-BIT PRIORITY ENCODER

HCC/HCF4532B
APPLICATIONS (continued)
0-TO-9 KEYBOARD ENCODER
TRUTH TABLE
Input
Output
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 GS Q3’ Q2’ Q1’ Q 0
1
X
X
X
X
X
X
X
X
X
0
1
0
0
1
0
1
X
X
X
X
X
X
X
X
0
1
0
0
0
0
0
1
X
X
X
X
X
X
X
1
0
1
1
1
0
0
0
1
X
X
X
X
X
X
1
0
1
1
0
0
0
0
0
1
X
X
X
X
X
1
0
1
0
1
0
0
0
0
0
1
X
X
X
X
1
0
1
0
0
0
0
0
0
0
0
1
X
X
X
1
0
0
1
1
0
0
0
0
0
0
0
1
X
X
1
0
0
1
0
0
0
0
0
0
0
0
0
1
X
1
0
0
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
X = Don’t Care
Logic 1 ≡ High
Logic 0 ≡ Low
8/15