These devices contain four independent 2-input AND gates. The open-collector
outputs require pull-up resistors to perform correctly. They 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
The SN5409, SN54LS09, and SN54S09 are characterized for operation over
the full military temperature range of -55°C to 125°C, The SN7409,
SN74LS09, and SN74S09 are characterized for operation from 0°C to 70°C.
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