Product details

Technology family LS Supply voltage (min) (V) 4.5 Supply voltage (max) (V) 5.5 Number of channels 4 IOL (max) (mA) 24 Supply current (max) (µA) 62000 IOH (max) (mA) -2.6 Input type Bipolar Output type 3-State Features High speed (tpd 10-50ns) Rating Military Operating temperature range (°C) -55 to 125
Technology family LS Supply voltage (min) (V) 4.5 Supply voltage (max) (V) 5.5 Number of channels 4 IOL (max) (mA) 24 Supply current (max) (µA) 62000 IOH (max) (mA) -2.6 Input type Bipolar Output type 3-State Features High speed (tpd 10-50ns) Rating Military Operating temperature range (°C) -55 to 125
CDIP (J) 14 130.4652 mm² 19.56 x 6.67 CFP (W) 14 58.023 mm² 9.21 x 6.3 LCCC (FK) 20 79.0321 mm² 8.89 x 8.89
  • Quad Bus Buffers
  • 3-State Outputs
  • Separate Control for Each Channel

The SN54125, SN54126, SN74125, SN74126, and SN54LS126A are obsolete and are no longer supplied.

  • Quad Bus Buffers
  • 3-State Outputs
  • Separate Control for Each Channel

The SN54125, SN54126, SN74125, SN74126, and SN54LS126A are obsolete and are no longer supplied.

These bus buffers feature three-state outputs that, when enabled, have the low impedance characteristics of a TTL output with additional drive capability at high logic levels to permit driving heavily loaded bus lines without external pullup resistors. When disabled, both output transistors are turned off, presenting a high-impedance state to the bus so the output will act neither as a significant load nor as a driver. The ’125 and ’LS125A devices’ outputs are disabled when G\ is high. The ’126 and ’LS126A devices’ outputs are disabled when G is low.

These bus buffers feature three-state outputs that, when enabled, have the low impedance characteristics of a TTL output with additional drive capability at high logic levels to permit driving heavily loaded bus lines without external pullup resistors. When disabled, both output transistors are turned off, presenting a high-impedance state to the bus so the output will act neither as a significant load nor as a driver. The ’125 and ’LS125A devices’ outputs are disabled when G\ is high. The ’126 and ’LS126A devices’ outputs are disabled when G is low.

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Technical documentation

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Type Title Date
* Data sheet Quadruple Bus Buffers With 3-State Outputs datasheet (Rev. A) 06 Feb 2002
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dec 2015
User guide LOGIC Pocket Data Book (Rev. B) 16 Jan 2007
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004
Application note TI IBIS File Creation, Validation, and Distribution Processes 29 Aug 2002
Application note Designing With Logic (Rev. C) 01 Jun 1997
Application note Designing with the SN54/74LS123 (Rev. A) 01 Mar 1997
Application note Input and Output Characteristics of Digital Integrated Circuits 01 Oct 1996
Application note Live Insertion 01 Oct 1996

Design & development

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Package Pins CAD symbols, footprints & 3D models
CDIP (J) 14 Ultra Librarian
CFP (W) 14 Ultra Librarian
LCCC (FK) 20 Ultra Librarian

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