The address must be latched since it is available only during the first part of the bus cycle. To signal that the address is ready to be latched a 1 is put on pin 25, the address latch enable (ALE) pin. Typically, the latching is accomplished using Intel 8282s, as shown in Fig.8-5. Because 8282 is an 8-bit latch, two of them are needed for 16-bit address and three are needed if a full 20-bit address is used.