Quad 2-Input AND Gates With Open Collector Outputs
This device DM74ALS09 contains four independent Gates each of which performs the Logic AND function. The open-collector outputs require external pull-up resistors for proper logical operation.
Pull-Up Resistor Equations
Where: N1 (IOH) = total maximum output HIGH current for all outputs tied to pull-up resistorN2 (IIH) = total maximum input HIGH current for all inputs tied to pull-up resistor
N3 (IIL) = total maximum input LOW current for all inputs tied to pull-up resistor
By Fairchild Semiconductor
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