Cygnal Say No No to External Crystal With New USB Microcontroller

2/4/2003 - Cygnal Integrated Products, Inc. announced the C8051F321, a mixed-signal flash microcontroller with an integrated full-speed USB 2.0 function controller. The C8051F321 requires no external components, not even resistors or a crystal, and is available in the tiny 5mm x 5mm 28-pin Micro Lead-Frame Package (MLP), making it the world’s smallest USB microcontroller solution available.

"The C8051F321 combines a comprehensive set of analog peripherals, Flash memory, and a USB function controller with Cygnal’s high-speed 8051 CPU," said Danny Allred, Director of Product Marketing for Cygnal. "The integrated PHY and clock-recovery circuit eliminate the need for any external components, such as resistors or a crystal, making the C8051F321 ideal for small form-factor USB applications."

The C8051F321 has a high throughput 24MIPS 8051 CPU, 16Kbytes of Flash memory, 2304 bytes of RAM, and 21 I/O pins. On-chip peripherals include a 1.5% internal oscillator with clock-recovery for USB, a 10-bit 200KSPS ADC, temperature sensor, UART, SMBus®, and SPI® bus. Prices start at $4.64 in 10,000 piece quantities.

The C8051F321 has on-chip debug circuitry facilitating full-speed in-system debug features such as single-stepping, breakpoints, and modifying registers and memory. The C8051F320DK Development kit sells for $229 with features typical of in-circuit emulators costing a thousand dollars or more. Both development kits and chips are available for purchase direct from Cygnal at

About Cygnal
Founded in March 1999, Cygnal Integrated Products, Inc. of Austin, TX designs, manufactures and markets advanced in-system programmable, mixed signal system-on-chip (SoC) products and associated support tools. These unique products embody the Company’s no-compromise attitude and distinguished technical skill base integrating world-class analog, high-speed digital and FLASH memory functions into a single powerful chip. The combination of mixed-signal integration and in-system programmability offers tangible user benefits through higher component integration, greater design flexibility, faster time-to-market, superior system performance and improved end product differentiation. Cygnal products deliver advanced application solutions expressly designed to address a broad range of markets including communications systems, industrial equipment and consumer products. Technical information is available and orders are accepted at the Company’s e-commerce site at

Cygnal and are trademarks of Cygnal Integrated Products, Inc. SPI is a trademark of Motorola, Inc. SMBus is a trademark in Intel Corp.

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