These devices contain four independent 2-input positive-AND gates. They perform the Boolean functions Y = A ? B or Y = A B in positive logic. The open-collector outputs require pullup resistors to perform correctly. These outputs may be connected to other open-collector outputs to implement active-low wired-OR or active-high wired-AND functions. Open-collector devices are often used to generate higher VOH levels. The SN54ALS09 is characterized for operation over the full military temperature range of ?55?C to 125?C. The SN74ALS09 is characterized for operation from 0?C to 70?C.