Octal Buffers/Drivers With 3-State Outputs

These octal Buffers drivers are designed specifically to improve both the performance and density of 3-state memory-address drivers, Clock Drivers and bus-oriented receivers and transmitters.
The ?AHCT244 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.
By Texas Instruments