onsemi 20-SOIC DM74LS240WM

The DM74LS240WM is a 74LS240 type Tri-State Octal Bus Transceiver manufactured by Fairchild (now part of ON Semiconductor). It's designed for asynchronous two-way communication between data buses in TTL logic systems. This device features eight channels and can enable or disable output drivers, allowing it to act as a buffer or as an interface for sharing a bus among multiple devices without conflict. The 'WM' suffix typically denotes a specific manufacturer's packaging or environmental variation.