BUY 74LS148 https://www.utsource.net/itm/p/15211.html
10-LINE-TO-4-LINE AND 8-LINE-TO-3-LINE PRIORITY ENCODERS
Package: SOP-16
Manufacturer: Texas Instruments/PAN
Description: The 74LS148 is a high-speed 8-line to 3-line priority encoder.
Features:
* Low power consumption
* High speed operation
* Outputs are active-low
* Inputs are active-high
Applications:
* Encoding of multiple inputs into a single output
* Address decoding
* Priority encoding
* Data selection
(For reference only)