C8051F303-GSR

Overview

The C8051F303-GSR is a mixed-signal ISP Flash MCU from Silicon Labs, featuring an 8051-compatible core with up to 25 MIPS throughput at 25 MHz. It includes 8 kB of in-system programmable Flash memory and 256 bytes of internal data RAM. The device integrates hardware-enhanced UART and SMBus serial ports, three general-purpose 16-bit counter/timers, and a 16-bit Programmable Counter Array (PCA). Operating voltage ranges from 2.7 V to 3.6 V, with a temperature range of –40 °C to +85 °C. Available in 11-pin QFN or 14-pin SOIC packages.

Feature Summary

• On-chip debug circuitry enables full-speed, non-intrusive in-system debugging without external emulators.
• Integrated analog peripherals include a comparator with programmable hysteresis and response time.
• Hardware-implemented UART and SMBus serial ports reduce software overhead for communication tasks.
• Flash memory supports in-circuit reprogramming for field upgrades and non-volatile data storage.

Applications

• In-system programming and firmware updates
• Serial communication interfaces using UART or SMBus
• Timing and control applications utilizing PCA capture/compare modules

Procurement Notes

Verify the specific package variant required, as the C8051F30x family is available in both 11-pin QFN and 14-pin SOIC configurations. Confirm that the design accommodates the 2.7 V to 3.6 V supply voltage range and the specified operating temperature limits. Note that this component family is marked as Not Recommended for New Designs; evaluate alternative solutions for long-term production viability.

Selection Notes

Select this model when an 8051 architecture with integrated analog comparators and standard digital peripherals is sufficient. The C8051F303 provides 8 kB of Flash and 256 bytes of RAM, distinguishing it from variants with different memory sizes. Ensure the application does not require the 8-bit ADC found only in the C8051F300/2 models, as the F303 lacks this peripheral.

Part Context

The C8051F303 belongs to the C8051F30x Mixed Signal ISP Flash MCU Family. This series offers fully integrated system-on-a-chip solutions combining a high-speed microcontroller core with on-chip Flash memory and various analog and digital peripherals. The family is designed for cost-sensitive applications requiring robust in-system programming capabilities and compact form factors.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.