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74LS257B

Part Number	74LS257B
Manufacturer	Motorola
Description	QUAD 2-INPUT MULTIPLEXER
Published	Aug 20, 2015
Detailed Description	QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The LSTTL / MSI SN54 / 74LS257B and the SN54 / 74LS258B are Quad 2-Input M...
Datasheet	74LS257B PDF File

Overview

QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The LSTTL / MSI SN54 / 74LS257B and the SN54 / 74LS258B are Quad 2-Input Multiplexers with 3-state outputs.
Four bits of data from two sources can be selected using a Common Data Select input.
The four outputs present the selected data in true (non-inverted) form.
The outputs may be switched to a high impedance state with a HIGH on the common Output Enable (EO) Input, allowing the outputs to interface directly with bus oriented systems.
It is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families.
• Schottky Process For High Speed • Multiplexer Expansion By Tying Outputs Together • Non-Inverting 3-State Outputs • Input Clamp Diodes Limit High Speed Termination Effects • Special Circuitry Ensures Glitch Free Multiplexing • ESD > 3500 Volts CONNECTION DIAGRAM DIP (TOP VIEW) VCC E0 I0c I1c Zc I0d I1d Zd 16 15 14 13 12 11 10 9 SN54/74LS257B VCC = PIN 16 GND = PIN 8 1 2 3 4 56 78 S I0a I1a Za I0b I1b Zb GND VCC E0 I0c I1c Zc I0d I1d Zd 16 15 14 13 12 11 10 9 SN54/74LS258B 1 2 3 4 56 78 S I0a I1a Za I0b I1b Zb GND NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.
SN54/74LS257B SN54/74LS258B QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY 16 1 16 1 16 1 J SUFFIX CERAMIC CASE 620-09 N SUFFIX PLASTIC CASE 648-08 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC FAST AND LS TTL DATA 5-1 SN54/74LS257B D SN54/74LS258B LOGIC DIAGRAMS SN54 / 74LS257B E0 15 I0a 2 I1a 3 I0b I1b 56 I0c 14 I1c 13 I0d 11 I1d 10 S 1 4 Za E0 15 I0a 2 I1a 3 7 12 Zb Zc SN54 / 74LS258B I0b 5 I1b 6 I0c 14 I1c 13 9 Zd I0d 11 I1d 10 S 1 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS 4 7 12 Za Zb Zc FAST AND LS TTL DATA 5-2 9 Zd SN54/74LS257B D SN54/74LS258B FUNCTIONAL DESCRIPTION The LS257B and LS258B are Quad 2-Input Multiplexers with 3-state ou...

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