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54AC253D датащи(PDF) 2 Page - National Semiconductor (TI) |
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54AC253D датащи(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 page Connection Diagrams Functional Description The ’AC/’ACT253 contains two identical 4-input multiplexers with TRI-STATE outputs. They select two bits from four sources selected by common Select inputs (S 0,S1). The 4-input multiplexers have individual Output Enable (OE a, OE b) inputs which, when HIGH, force the outputs to a high impedance (High Z) state. This device is the logic implemen- tation of a 2-pole, 4-position switch, where the position of the switch is determined by the logic levels supplied to the two select inputs. The logic equations for the outputs are shown: Z a = OEa • (I0a • S1 • S0 +I1a • S1 • S0 + I 2a • S1 • S0 +I3a • S1 • S0) Z b = OEb • (I0b • S1 • S0 +I1b • S1 • S0 + I 2b • S1 • S0 +I3b • S1 • S0) If the outputs of TRI-STATE devices are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. De- signers should ensure that Output Enable signals to TRI-STATE devices whose outputs are tied together are de- signed so that there is no overlap. Truth Table Select Data Inputs Output Outputs Inputs Enable S 0 S 1 I 0 I 1 I 2 I 3 OE Z X X XXXX H Z L L L XXX L L L L H XXX L H H L XLX X L L H L XHX X L H L H X XLX L L L H X XHX L H H H XXX L L L H H XXX H L H Address Inputs S0 and S1 are common to both sections. H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Pin Assignment for DIP and Flatpak DS100285-3 Pin Assignment for LCC DS100285-4 www.national.com 2 |
Аналогичный номер детали - 54AC253D |
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Аналогичное описание - 54AC253D |
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