SCLS251I october 1995 – april 2023 SN54AHC240 , SN74AHC240
PRODMIX
Refer to the PDF data sheet for device specific package drawings
The 'AHC240 devices are organized as two 4-bit buffers/line drivers with separate output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.