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74HC257

Part Number	74HC257
Manufacturer	Hitachi
Description	Quad. 2-to-1-line Data Selectors/Multiplexers
Published	May 28, 2005
Detailed Description	HD74HC257 Quad. 2-to-1-line Data Selectors/Multiplexers (with noninverted 3-state outputs) Description The large output...
Datasheet	74HC257 PDF File

Overview

HD74HC257 Quad.
2-to-1-line Data Selectors/Multiplexers (with noninverted 3-state outputs) Description The large output drive capability coupled with the 3-state feature make this device ideal for interfacing with bus lines in a bus organized system.
When the output control input line is taken high, the outputs of all four multiplexers are sent into a high impedance state.
When the output control line is low, the select input chooses whether the A or B input is used.
Features • • • • • High Speed Operation: tpd (Data to Y) = 10.
5 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Inputs Output Control L L L L H Select L L H H X A L H X X X B X X L H X Outputs Y L H L H High impedance Notes H: high level, L: low level, X: irrelevant HD74HC257 Pin Arrangement Select 1A 1B 1Y 2A 2B 2Y GND 1 2 3 4 5 6 7 8 (Top view) 1A 1B ...

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