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74LS257BN
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 SN54/74LS257B SN54/74LS258B QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 16 1 N SUFFIX PLASTIC CASE 648-08 CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 E0 15 I0c 14 I1c 13 Zc 12 I0d 11 I1d 10 Zd 16 9 SN54/74LS257B 1 VCC = PIN 16 GND = PIN 8 16 1 1 S 2 I0a 3 I1a 4 Za 5 I0b 6 I1b 7 Zb 8 GND VCC 16 E0 15 I0c 14 I1c 13 Zc I0d 11 I1d 10 Zd D SUFFIX SOIC CASE 751B-03 12 2 I0a 3 I1a 4 Za 5 I0b 6 I1b SN54LSXXXJ SN74LSXXXN SN74LSXXXD 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. SN54/74LS258B 1 S ORDERING INFORMATION 7 Zb 8 GND FAST AND LS TTL DATA 5-1 Ceramic Plastic SOIC
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