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74AC253PC Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74AC253PC Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 12 page ©1988 Fairchild Semiconductor Corporation www.fairchildsemi.com 74AC253, 74ACT253 Rev. 1.5 2 Logic Diagram IEEE/IEC Functional Description The AC/ACT253 contains two identical 4-input multiplex- ers with 3-STATE outputs. They select two bits from four sources selected by common Select inputs (S0, S1). The 4-input multiplexers have individual Output Enable (OEa, OEb) inputs which, when HIGH, force the outputs to a high impedance (High Z) state. This device is the logic implementation 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: Za = OEa •(I0a • S1 • S0 + I1a • S1 • S0 + I2a • S1 • S0 + I3a • S1 • S0) Zb = OEb •(I0b • S1 • S0 + I1b • S1 • S0 + I2b • S1 • S0 + I3b • S1 • S0) If the outputs of 3-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. Designers should ensure that Output Enable signals to 3-STATE devices whose outputs are tied together are designed so that there is no overlap. Truth Table Address Inputs S0 and S1 are common to both sections. H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Select Inputs Data Inputs Output Enable Outputs S0 S1 I0 I1 I2 I3 OE Z XXXXXX H Z LLL X X X L L LL H XXX L H H LXLX X L L HL XHX X L H LH X XLX L L LH X XHX L H HH XXX L L L HH XXX H L H |
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