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Meaning it has two set of pins A0-A7 and B0-B7 , in which each set has 8 pins. Out of these two sets one set can be used as input and the other set can be used as output. Since the IC is a transceiver IC, Data can flow from input bus to output bus and also from output bus to input bus, by simply toggling the Direction pin DIR pin as required. It also has a decent output current of 35mA and hence can be used to drive nominal loads. So if you are looking for an IC to act as a buffer or as a transceiver for your address or data bus.
Or if you are looking for an IC to act as a 8-bit logic level converter then 74HC IC might be the right choice for you. So in these cases we have to shift one set of operating voltage 3. In these cases we employ a logic level converter; the simplest logic level converter is a potential divider.
But it is not efficient for high speed operation or for bi-directional communication buses. Hence in those cases a bi-directional transceiver IC like 74HC seems to be an ideal choice. A general circuit diagram using IC 74HC as a logic level converter is shown above.
Here we are converting the 3. Also we can reduce the input leakage current by disabling the inputs by using the OE pin as shown in the table above. The output voltage will always be equal to the Vcc voltage, so here since we are converting the 3.
74HCT221 DATASHEET PDF