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74HCT646DB Fiches technique(PDF) 4 Page - NXP Semiconductors |
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74HCT646DB Fiches technique(HTML) 4 Page - NXP Semiconductors |
4 / 12 page September 1993 4 Philips Semiconductors Product specification Octal bus transceiver/register; 3-state 74HC/HCT646 Fig.4 Functional diagram. FUNCTION TABLE Notes 1. H = HIGH voltage level L = LOW voltage level X = don’t care ↑ = LOW-to-HIGH level transition 2. The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always enabled, i.e., data at the bus inputs will be stored on every LOW-to-HIGH transition on the clock inputs. INPUTS (1) DATA I/O (2) FUNCTION OE DIR CPAB CPBA SAB SBA A0 to A7 B0 to B7 H H X X H or L ↑ H or L ↑ X X X X input input isolation store A and B data L L L L X X X H or L X X L H output input real-time B data to A bus stored B data to A bus L L H H X H or L X X L H X X input output real-time A data to B bus stored A data to B bus |
Numéro de pièce similaire - 74HCT646DB |
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Description similaire - 74HCT646DB |
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