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U421 Specifications

Board Size: 1.5 inches (38.1mm) long and 0.75 inches (19.1mm) wide.

Board Type: 24-pin PCB in a "DIP-like" format, rows spaced .6" (15.2mm) apart.

Computer Interface: USB

USB Cable Length: 36 inches (914 mm).

USB Connection type: Removable cable.

USB Power Type: Bus powered, uses the 5V provided by the USB interface.

Specified USB allowed current draw: 100mA standard, total.

Bandwidth: 800 bytes per second as a HID device.

USB Bus Speed: 1.5Mbits⁄s. (Low speed)

USB Driver: HID, part of the operating system.

Device Interface: 16 CMOS lines, selectable as inputs⁄outputs.

Controller Device: Cypress CY7C63743.

USB Cable Pin#, Color, Function Chart

Pin Number   Wire Color Function
1   Red Vusb
2   White D-
3   Green D+
4   Black Ground⁄Shield

PC USB Port (Female 'A')

Board Layout:

Hardware:  U401 USB Interface    U421 USB Interface   U451 USB Interface

Programming:  USBm DLL Programming    Download Files

Application Notes:  U4x1 Application Notes    Misc Applications and Information    FAQ

While every effort has been made to make sure that the information posted on this site is correct, the author can not be held liable for any damages whatsoever for losses as a result of the application of this information. Use this information at your own risk.

USBmicro can design your custom and semi-custom USB product. Email about USB design can be directed to " Robert " at

Copyright © USBmicro, L.L.C., 2002-2010

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