These quadruple 2-line to 1-line data selectors/multiplexers are designed for 2-V to 5.5-V VCC operation. The ?AHC257 devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at a high logic level. 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. The SN54AHC257
is characterized for operation over the full military temperature range of ?55?C to 125?C. The SN74AHC257
is characterized for operation from ?40?C to 85?C.