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Because I have not tested all electronic circuits mentioned on this pages, I cannot attest to their accuracy; therefore, I do not provide a warranty of any kind and cannot be held responsible in any manner.
USB interface chips
15. September 2007 - 12:33 — admin
If you need an USB interface for your circuit, try to use Delcom's 
one.
The Delcom's USB chips are based on the Cypress' 7C63xxx USB controllers. Delcom provides ready-to-use solution, which means already programmed chip in the DIL or SOIC package. You have to attach two resistors, one capacitor and 6MHz resonator to obtain USB device.
Delcom USBIO chip provides 10-16 GPIOs (depend on the package size), controlled by rich instruction set, as well as the I2C or SPI interface (it depends on the model).
USBIO costs 8 USD, I have ordered some pieces to test just few minutes before...