HD74HC149 Overview
The HD74HC149 is priority encoder which has 8 input lines (0 - 7) and 8 output lies (Y0 - Y7). It is the logical bination of a HD74HC148 8-3 line priority encoder driving a HD74HC138 3-8 line decoder. Only one request output can be low at a time.
HD74HC149 Key Features
- High Speed Operation: tpd (0
- 0.5 1.35 1.8
- 0.5 1.5 3.15 4.2
- 1.9 4.4 5.9 4.13 5.63
- Output voltage
- 4.4 4.5
- 5.9 6.0
- Input current Quiescent supply current
- 7 to Y, P
- 31 26 75 15 13 10
