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Partname: | 74FCT2257CTSOCTE4 |
Description: | Quadruple 1-of-2 Data Selectors/Multiplexers with 3-State Outputs and Series Damping Resistors |
Manufacturer: | Texas Instruments |
Datasheet: | PDF (260K). Click here to download *) |
The CY74FCT2257T has four identical two-input multiplexers that select four bits of data from two sources under the control of a common data-select (S) input. The I0 inputs are selected when S is low, and the I1 inputs are selected when S is high. Data appears at the output in noninverted form for the CY74FCT2257T. On-chip termination resistors at the outputs reduce system noise caused by reflections. The CY74FCT2257T can replace the FCT257T to reduce noise in an existing design. The CY74FCT2257T is a logic implementation of a four-pole, two-position switch, in which the position of the switch is determined by the logic levels supplied to S. Outputs are forced to the high-impedance off state when the output-enable (OE) input is high. All but one device must be in the high-impedance state to prevent currents from exceeding the maximum ratings if outputs are tied together. Design of the OE signals must ensure that there is no overlap when outputs of 3-state devices are tied together. |
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