Datasheet
DM74ALS09 is a device that can perform the logic AND function and has four independent gates. External pull-up resistors are required for proper logical operation.
Datasheet
This document describes the features and characteristics of DM74ALS09 Quad 2-Input AND Gate with Open Collector Outputs, including its four independent gates, the requirement of external pull-up resistors for logical operation, the adoption of advanced oxide-isolated, ion-implanted Schottky TTL process, compatibility with Schottky and low power Schottky TTL counterparts, and improved AC performance.
