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74LS257B - Quad 2-Data Selectors/Multiplexers

Download the 74LS257B datasheet PDF. This datasheet also covers the 74LS258B variant, as both devices belong to the same quad 2-data selectors/multiplexers family and are provided as variant models within a single manufacturer datasheet.

Description

These Schottky-clamped high-performance multiplexers feature TRI-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

Features

  • Y TRI-STATE versions LS157 and LS158 with same pinouts Y Schottky-clamped for significant improvement in A-C performance Y Provides bus interface from multiple sources in highperformance systems Y Average propagation delay from data input 12 ns Y Typical power dissipation LS257B 50 mW LS258B 35 mW Y Alternate military aerospace devices (54LS257A 54LS258A) are available Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagrams Dual-In-Line Package Dual-In-.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (74LS258B-NationalSemiconductor.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
74LS257B 3-STATE Quad 2-Data Selectors/Multiplexers Fairchild Semiconductor
74LS257B QUAD 2-INPUT MULTIPLEXER Motorola
74LS257B QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS Texas Instruments
74LS257 LOW POWER SCHOTTKY ON Semiconductor
74LS257 3-STATE Quad 2-Data Selectors/Multiplexers Fairchild Semiconductor

Other Datasheets by National Semiconductor (Texas Instruments)

Part Number Description
74LS257 TRI-STATE Quad 2-Data Selectors/Multiplexers
74LS256 Dual 4-Bit Addressable Latch
74LS258B Quad 2-Data Selectors/Multiplexers
74LS20 Dual 4-Input NAND Gates
74LS240 Octal TRI-STATE Buffers/Line Drivers/Line Receivers

Full PDF Text Transcription

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54LS257A DM54LS257B DM74LS257B 54LS258A DM54LS258B DM74LS258B TRI-STATE Quad 2-Data Selectors Multiplexers June 1989 54LS257A DM54LS257B DM74LS257B 54LS258A DM54LS258B DM74LS258B TRI-STATE Quad 2-Data Selectors Multiplexers General Description These Schottky-clamped high-performance multiplexers feature TRI-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 TRI-
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