Features: Operating Range 2-V to 5.5-V VCCLatch-Up Performance Exceeds 250 mA Per JESD 17ApplicationAudioAutomotiveBroadbandDigital ControlMilitaryOptical Networking SecurityTelephonyVideo & ImagingWirelessPinoutSpecificationsSupply voltage range, VCC . . . . . . . . . . . .. . .. . . .. . . ....
SN54AHC244: Features: Operating Range 2-V to 5.5-V VCCLatch-Up Performance Exceeds 250 mA Per JESD 17ApplicationAudioAutomotiveBroadbandDigital ControlMilitaryOptical Networking SecurityTelephonyVideo & Ima...
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Features: PinoutSpecificationsDescriptionThe SN54/74LS147 and SN54/74LS148 are Priority Encoders. ...
PinoutDescriptionThe LS155 and LS156 are Dual 1-of-4 Decoder/Demultiplexers with common Address in...

These octal buffers/drivers of SN54AHC244 are designed specifically to improve the performance and density of 3-state memory-address drivers, clock drivers, and bus-oriented receivers and transmitters.
The SN54AHC244 devices are organized as two 4-bit buffers/line drivers with separate output-enable (OE) inputs. When OE is low, the SN54AHC244 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 SN54AHC244 is determined by the current-sinking capability of the driver.