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74F652A Folha de dados(PDF) 5 Page - NXP Semiconductors |
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74F652A Folha de dados(HTML) 5 Page - NXP Semiconductors |
5 / 14 page Philips Semiconductors Product specification 74F651A/74F652A Transceivers/registers 1999 Jun 23 5 The following examples demonstrate the four fundamental bus-management functions that can be performed with the 74F651A and 74F652A. The select pins determine whether data is stored or transferred through the device in real time. The output enable pins determine the direction of the data flow. BUS MANAGEMENT FUNCTIONS REAL TIME BUS TRANSFER BUS B TO BUS A REAL TIME BUS TRANSFER BUS A TO BUS B STORAGE FROM A, B, OR A AND B TRANSFER STORED DATA TO A AND/OR B OEAB OEBA CPAB CPBA SAB SBA OEAB OEBA CPAB CPBA SAB SBA OEAB OEBA CPAB CPBA SAB SBA OEAB OEBA CPAB CPBA SAB SBA BUS A BUS A BUS A BUS A BUS B BUS B BUS B BUS B SF00409 L L X X X L H H XXL X X H ↑ XX X LX X ↑ XX LH ↑↑ XX H L H or L H or L H H FUNCTION TABLE INPUTS DATA I/O OPERATING MODE OEAB OEBA CPAB CPBA SAB SBA An Bn 74F651A 74F652A L H H or L H or L X X Input Input Isolation Isolation L H ↑ ↑ X X Input Input Store A and B data Store A and B data X H ↑ H or L X X Input Unspecified* Store A, hold B Store A hold B H H ↑ ↑ L X Input Output Store A in both registers Store A in both registers L X H or L ↑ X X Unspecified* Input Hold A, store B Hold A, store B L L ↑ ↑ X L Output Input Store B in both registers Store B in both registers L L X X X L Output Input Real time B data to A bus Real time B data to A bus L L X H or L X H Output Input Stored B data to A bus Stored B data to A bus H H X X L X Input Output Real time A data to B bus Real time A data to B bus H H H or L X H X Input Output Stored A data to B bus Stored A data to B bus H L H or L H or L H H Output Output Stored A data to B bus Stored A data to B bus H L H or L H or L H H Output Output Stored B data to A bus Stored B data to A bus Notes to function table 1. H = High-voltage level 2. L = Low-voltage level 3. * = The data output function may be enabled or disabled by various signals at the OEBA and OEAB inputs. Data input functions are always enabled, i.e., data at the bus pins will be stored on every low-to-high transition of the clock. 4. ↑ = Low-to-high clock transition 5. X = Don’t care |
Nº de peça semelhante - 74F652A |
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Descrição semelhante - 74F652A |
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