The 74F257 is designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs will not load the data lines when the output enable (OE) input is at a high logic level.
The 74F257 is characterized for operation from 0°C to 70°C.
3-State Outputs Interface Directly With System Bus
Provides Bus Interface From Multiple Sources in High-Performance Systems
16 pin DIP. Actual brand may vary from picture.