C8051F301R

Overview

The C8051F301R is a mixed-signal ISP Flash microcontroller from Silicon Labs, featuring an 8-bit CIP-51 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). It operates on a supply voltage of 2.7 V to 3.6 V within a temperature range of –40 °C to +85 °C.

Feature Summary

• High-speed pipelined 8051 architecture executing most instructions in one or two system clocks
• In-system programmable non-volatile Flash memory for field upgrades
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators
• Hardware-enhanced UART and SMBus serial communication interfaces

Applications

• Embedded systems requiring in-system programming capabilities
• Industrial control applications operating in extended temperature ranges
• Low-power portable devices utilizing stop mode current savings
• Systems needing direct UART and SMBus connectivity

Procurement Notes

Verify the specific suffix 'R' indicates tape-and-reel packaging when ordering. Confirm that the component status is acceptable for your design lifecycle, as this family is marked Not Recommended for New Designs. Ensure compatibility with existing firmware architectures designed for the C8051F30x series before procurement.

Selection Notes

Select the C8051F301R when 8 kB of Flash and 256 bytes of RAM are sufficient for the application logic. Choose this part over variants like the F300 or F302 if an integrated ADC is not required, as those models include additional analog peripherals. Verify that the 11-pin QFN or 14-pin SOIC package fits the physical constraints of the target PCB layout.

Part Context

The C8051F301R belongs to the C8051F30x family of mixed-signal microcontrollers produced by Silicon Labs. This family is characterized by fully static operation and high integration of digital and analog peripherals on a single chip. The CIP-51 core provides enhanced performance compared to standard 8051 implementations while maintaining binary compatibility.

Replacement Considerations

Silicon Labs recommends EFM8BB series microcontrollers as modern replacements for this legacy family due to updated features and support status.