The 74F257A has four identical 2-input multiplexers with 3-State outputs which select 4 bits of data from two sources uncer control of a common Select (S) input. The I0a inputs are selected when the common Select input is Low and the I1n inputs are selected when the common Select input is High. Data appears at the outputs in true non-inverted form from the selected inputs. The 74F257A is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined
The Philips 74F257A is an integrated circuit containing four identical 2-input multiplexers with 3-state outputs. It selects 4 bits of data from two sources under the control of a common Select input, implementing the logic of a 4-pole, 2-position switch. The device features non-inverting data paths and allows outputs to be forced into a high-impedance state when the Output Enable input is High.
| Number of multiplexers | Four |
|---|---|
| Input configuration | 2-input |
| Output type | 3-State |
| Operating temperature (Industrial) | -40°C to +85°C |
The common Select input determines which data source is selected; Low selects the I0a inputs and High selects the I1n inputs.
Outputs are forced to a high impedance off state when the Output Enable (OE) input is High.
The data path is non-inverting, meaning data appears at the outputs in true non-inverted form from the selected inputs.