These devices are designed to multiplex signals from four-bit data sources to four-output data lines in bus-organized systems. The 3-state outputs will not load the data lines when the output control pin (G\) is at a high-logic level. The 74S257N is characterized for operation from 0°C to 70°C.
Three-State Outputs Interface Directly with System Bus
16 pin DIP. Manufactured by Signetics.