Product details

Number of channels (#) 8 Technology Family LS Input type Schmitt-Trigger Output type Push-Pull Features High speed (tpd 10-50ns)
Number of channels (#) 8 Technology Family LS Input type Schmitt-Trigger Output type Push-Pull Features High speed (tpd 10-50ns)
PDIP (N) 20 229 mm² 24.33 x 9.4 SOIC (DW) 20 132 mm² 12.8 x 10.3 SOP (NS) 20 98 mm² 12.6 x 7.8
  • Compares Two-8-Bit Words
  • Choice of Totem-Pole or Open-Collector Outputs
  • Hysteresis at P and Q Inputs
  • 'LS682 has 20-k Pullup Resistors on the Q Inputs
  • SN74LS686 and 'LS687 … JT and NT 24-Pin, 300-Mil Packages
  • Compares Two-8-Bit Words
  • Choice of Totem-Pole or Open-Collector Outputs
  • Hysteresis at P and Q Inputs
  • 'LS682 has 20-k Pullup Resistors on the Q Inputs
  • SN74LS686 and 'LS687 … JT and NT 24-Pin, 300-Mil Packages

These magnitude comparators perform comparisons of two eight-bit binary or BCD words. All types provide P = Q\ outputs and all except 'LS688 provide P > Q\ outputs as well. The 'LS682, 'LS684, 'LS686, and 'LS688 have totem-pole outputs, while the 'LS685 and 'LS687 have open-collector outputs. The 'LS682 features 20-k pullup termination resistors on the Q inputs for analog or switch data.

These magnitude comparators perform comparisons of two eight-bit binary or BCD words. All types provide P = Q\ outputs and all except 'LS688 provide P > Q\ outputs as well. The 'LS682, 'LS684, 'LS686, and 'LS688 have totem-pole outputs, while the 'LS685 and 'LS687 have open-collector outputs. The 'LS682 features 20-k pullup termination resistors on the Q inputs for analog or switch data.

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Technical documentation

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Type Title Date
* Data sheet 8-Bit Magnitude/Identity Comparators datasheet 01 Mar 1988
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
More literature Logic Cross-Reference (Rev. A) 07 Oct 2003
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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Evaluation board

14-24-LOGIC-EVM — Generic Logic EVM Supporting 14 through 24 Pin PW, DB, D, DW, NS, P, N, and DGV Packages

This EVM is designed to support any logic device that has a D, DW, DB, NS, PW, P, N, or DGV package in a 14 to 24 pin count.
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Package Pins Download
PDIP (N) 20 View options
SO (NS) 20 View options
SOIC (DW) 20 View options

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