HD74HC149 - 8-to-8-line Priority Encoder
The HD74HC149 is priority encoder which has 8 input lines (0 - 7) and 8 output lies (Y0 - Y7).
It is the logical combination 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.
The output that is low is dependent on the highest
HD74HC149 Features
* High Speed Operation: tpd (0 - 7 to Y) = 16 ns typ (CL = 50 pF)
* High Output Current: Fanout of 10 LSTTL Loads
* Wide Operating Voltage: VCC = 2 to 6 V
* Low Input Current: 1 µA max
* Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
