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DM74S257

Fairchild Semiconductor
Part Number DM74S257
Manufacturer Fairchild Semiconductor
Description 3-STATE Quad 1-of-2 Data Selector/Multiplexer
Published Jan 11, 2006
Detailed Description DM74S257 3-STATE Quad 1-of-2 Data Selector/Multiplexer August 1986 Revised May 2000 DM74S257 3-STATE Quad 1-of-2 Data ...
Datasheet PDF File DM74S257 PDF File

DM74S257
DM74S257

Overview
DM74S257 3-STATE Quad 1-of-2 Data Selector/Multiplexer August 1986 Revised May 2000 DM74S257 3-STATE Quad 1-of-2 Data Selector/Multiplexer General Description These Schottky-clamped high-performance multiplexers feature 3-STATE outputs that can interface directly with data lines of bus-organized systems.
With all but one of the common outputs disabled (at a high impedance state), the low impedance of the single enabled output will drive the bus line to a HIGH or LOW logic level.
To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output enable circuitry is designed such that the output disable times are shorter than the output enable times.
This 3-STATE output feature means that n-bit (paralleled) data selectors with up to 258 sources can be implemented for data buses.
It also permits the use of standard TTL registers for data retention throughout the system.
Features s 3-STATE versions S157, S158, with same pin-outs s Schottk...


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