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74ACT652 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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74ACT652 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 8 page 3 www.fairchildsemi.com Functional Description In the transceiver mode, data present at the HIGH imped- ance port may be stored in either the A or B register or both. The select (SAB, SBA) controls can multiplex stored and real-time. The examples in Figure 1 demonstrate the four fundamen- tal bus-management functions that can be performed with the Octal bus transceivers and receivers. Data on the A or B data bus, or both can be stored in the internal D-type flip-flop by LOW to HIGH transitions at the appropriate Clock Inputs (CPAB, CPBA) regardless of the Select or Output Enable Inputs. When SAB and SBA are in the real time transfer mode, it is also possible to store data without using the internal D-type flip-flops by simulta- neously enabling OEAB and OEBA. In this configuration each Output reinforces its Input. Thus when all other data sources to the two sets of bus lines are in a HIGH imped- ance state, each set of bus lines will remain at its last state. FIGURE 1. Note A: Real-Time Note B: Real-Time Transfer Bus B to Bus A Transfer Bus A to Bus B OEAB OEBA CPAB CPBA SAB SBA OEAB OEBA CPAB CPBA SAB SBA L L XXX L H H X X L X Note C: Storage Note D: Transfer Storage Data to A or B OEAB OEBA CPAB CPBA SAB SBA OEAB OEBA CPAB CPBA SAB SBA XH X X X H L H or L H or L H H LX X XX LH XX |
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Descripción similar - 74ACT652 |
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