LS7166A 24-bit Quadrature Counter

LS7166A Features

  • Programmable count modes
  • DC to 40MHz count frequency
  • 8-Bit I/O Bus for μP communication and control
  • 24-Bit comparator for pre-set count comparison
  • Readable status register
  • Input/Output TTL and CMOS compatible
  • 3V to 5.5V operation
  • 20-pin DIP package

See more info below

Configure the LS7166A

LS7166A Product Description

Restriction of Hazardous Substances

The LSI Computer Systems LS7166A is a CMOS, 24-bit counter which can be programmed to operate in several functional modes. The operating modes are set up by writing configuration data into control registers. There are three 6-bit and one 2-bit control registers for configuring the functional modes. In addition to the control registers there is a 5-bit status register which indicates the instantaneous device status. A 24-bit preset register is available for presetting the counter. It also serves as the division factor in the mod-N count mode. The device communicates with a host controller over an 8-bit 3-state bidirectional data bus through read/write operations. In addition, a number of discrete inputs and outputs facilitate instantaneous hardware control functions and instantaneous status indication.

View the Manufacturer's Datasheet

Additional Information

Product Notes

  • US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.

Downloads Available


  • See link in product description above

3D Model Downloads

Please configure your product first to download a 3D model.
(Note: The formats below will become links if there are 3D models available.)

    • SolidWorks format
    • IGES format
    • Parasolid format
    • STEP format

    Product Configurator

    For pricing, this product requires configuration.

    Begin by completing either Option 1 or 2 below. Questions? Contact our support team.

    Option 1: Configure the Product

    Use the configuration tool to provide information regarding your product needs. Not sure what to do or need additional assistance? Our support team is here to help.

    We recommend enabling Javascript when using the product configurator.

    Option 2: Enter the Product Part Number Directly

    If you know your product part number, enter it in the following field. The part number format looks something like this: E5-5000-394-IE-S-D-D-3...

    LS7166A Pricing

    Quantity Unit Price
    1 $12.23
    10 $11.20
    50 $9.80
    100 $7.82
    Over 100 Call for Quote
    Quantity Unit Price Subtotal
    $12.23 $12.23

    For purchasing or volume discounts, please configure the part above, then use the completed part number and contact us!


    US Digital's mission is a commitment to quality and constant improvement. If you find an error to a product on this page, please let us know!