|Category||Logic => Buffers/Inverters => 3-State|
|Description||Quad 2-line to 1-line Selector/multiplexer, Non-inverting 3-state|
|Company||Philips Semiconductors (Acquired by NXP)|
|Datasheet||Download I74F257AD datasheet
|Cross ref.||Similar parts: SN74F257D, CD74ACT157, CD74ACT158, CD74ACT257, CD74ACT258, CD74HCT157, CY74FCT157T, CY74FCT257T, SN74AHCT157, SN74AHCT158|
Industrial range available to +85°C) Multifunction capability Non-inverting data path 3-State outputs See 74F258A for inverting versionDESCRIPTION
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 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the common Slect input. Outputs are forced to a high impedance "off" state when the Output Enable (OE) is High. All but one device must be in high impedance state to avoid currents that would exceed the maximum rating if the outputs were tied together. Design of the Output Enable signals must ensure that there is no overlap when outputs of 3-state devices were tied together.
ORDER CODE DESCRIPTION 16-pin plastic DIP 16-pin plastic SO COMMERCIAL RANGE VCC 5V ±10%, Tamb N74F257AN N74F257AD INDUSTRIAL RANGE VCC 5V ±10%, Tamb I74F257AN I74F257AD DRAWING NUMBER SOT38-4 SOT109-1
PINS Yd DESCRIPTION Data inputs Common Select input Output Enable input (active Low) Data outputs 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW 20µA/0.6mA 3.0mA/20mANOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
High voltage level Low voltage level Don't care High impedance "off" state
S0 WORD A WORD B WORD C WORD D WORD E WORD F WORD G WORD H
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