# LSI Computer Systems, Inc. (LSI/CSI)

> LSI/CSI is a U.S. fabless semiconductor company, founded in 1969 and headquartered in Melville, New York. It designs and supplies standard and custom CMOS/mixed-signal integrated circuits for motion control, quadrature counting/encoding, lighting and LED control, line driving, and related industrial and consumer applications. Parts are available worldwide through distributors including Digi-Key and Mouser, and LSI/CSI also develops custom ICs/ASICs. Website: https://lsicsi.com

## Product categories
- [Counters](https://lsicsi.com/shop-products/counters/): quadrature and up/down counter ICs (e.g. LS7366R 32-bit SPI, LS7866 32-bit I²C, LS7166/LS7267 parallel-bus)
- [Incremental encoder interface](https://lsicsi.com/shop-products/incremental-encoder-interface/): quadrature clock converters and encoder-to-counter interface ICs (LS7083/LS7084, LS7183/LS7184)
- [Frequency dividers](https://lsicsi.com/shop-products/frequency-dividers/)
- [Digital potentiometers](https://lsicsi.com/shop-products/digital-potentiometers/): SPI- and encoder-controlled digital rheostats (e.g. LS7190)
- [Line drivers](https://lsicsi.com/shop-products/line-drivers/): differential line drivers and receivers (e.g. LS7272 30V quad differential line driver, LS7372 receiver)
- [Stepper motor controls](https://lsicsi.com/shop-products/stepper-motor-controls/)
- [Brushless DC motor controls](https://lsicsi.com/shop-products/brushless-dc-motor-controls/)
- [AC motor controls](https://lsicsi.com/shop-products/ac-motor-controls/)
- [Lighting controls](https://lsicsi.com/shop-products/lighting-controls/): touch, dimmer and lamp-control ICs (e.g. LS7641 LED/incandescent dimmer)
- [LED drivers](https://lsicsi.com/shop-products/led-drivers/): direct-AC LED driver ICs (e.g. LS9100X, LS9200)
- [PIR motion detection](https://lsicsi.com/shop-products/pir-motion-detection/)
- [Programmable digital locks](https://lsicsi.com/shop-products/programmable-digital-locks/)
- [Timers](https://lsicsi.com/shop-products/timers/)
- [Development kits](https://lsicsi.com/shop-products/development-kits/): Arduino shields and evaluation boards (e.g. 6-channel LS7366R quadrature-counter shield)

## Featured products
- [LS7366R — 32-bit quadrature counter, SPI](https://lsicsi.com/products/ls7366r-s-ls7366r-ts-ls7366r/)
- [LS7866 — 32-bit quadrature counter, I²C](https://lsicsi.com/products/ls7866c/)
- [LS7190/LS7191/LS7192 — digital potentiometer / rheostat](https://lsicsi.com/products/ls7190-ls7191-ls7192/)
- [LS9200 — dimmable direct-AC LED driver](https://lsicsi.com/products/ls9200/)
- [LS7641 — LED / incandescent light dimmer](https://lsicsi.com/products/ls7641/)
- [LS7272B — 30V quad-channel differential line driver](https://lsicsi.com/products/ls7272b-ls7272b-20/)

## Engineering resources
- [Application notes](https://lsicsi.com/app-notes/)
- [Brochures & catalog](https://lsicsi.com/brochures-and-catalog/)
- [FAQ](https://lsicsi.com/faq/)
- [Blog / technical articles](https://lsicsi.com/blog/)
- [Full product index](https://lsicsi.com/products/)

## Ordering & support
- [Distributors (worldwide)](https://lsicsi.com/distributors/)
- [Sales representatives](https://lsicsi.com/representatives/)
- [Request samples](https://lsicsi.com/request-samples/)
- [Request a quote](https://lsicsi.com/request-a-quote/)
- [Ordering information](https://lsicsi.com/ordering-info/)
- [Custom IC / ASIC inquiries](https://lsicsi.com/contact/)

## Company
- [About](https://lsicsi.com/about/)
- [Our story](https://lsicsi.com/our-story/)
- [Careers](https://lsicsi.com/careers/)
- [Contact](https://lsicsi.com/contact/)