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DM74LS257B

Fairchild Semiconductor
Part Number DM74LS257B
Manufacturer Fairchild Semiconductor
Description 3-STATE Quad 2-Data Selectors/Multiplexers
Published Oct 9, 2005
Detailed Description DM74LS257B 3-STATE Quad 2-Data Selectors/Multiplexers June 1989 Revised November 1999 DM74LS257B 3-STATE Quad 2-Data S...
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DM74LS257B
DM74LS257B

Overview
DM74LS257B 3-STATE Quad 2-Data Selectors/Multiplexers June 1989 Revised November 1999 DM74LS257B 3-STATE Quad 2-Data Selectors/Multiplexers 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 LS157 and LS158 with same pinouts s Sch...


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