C8051F851-C-IUR

Overview

The C8051F851-C-IUR is an 8-bit microcontroller from the Silicon Labs C8051F85x/86x family, featuring a High-Speed CIP-51 core with up to 25 MIPS throughput at a 25 MHz clock. It includes up to 8 kB of in-system programmable Flash memory and 512 Bytes of RAM. The device integrates a 12-bit ADC with up to 16 channels, two analog comparators, and communication peripherals including UART, I2C/SMBus, and SPI. Operating voltage ranges from 2.2 V to 3.6 V, with industrial temperature support (-40°C to +125°C).

Feature Summary

• High-speed CIP-51 core delivering up to 25 MIPS performance using a standard 8051 instruction set.
• Integrated on-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators.
• Dual internal oscillators providing a calibrated 24.5 MHz high-frequency source and an independent 80 kHz low-frequency clock for watchdog operations.
• Versatile analog subsystem comprising a 12-bit ADC with burst mode capabilities and two programmable analog comparators.

Applications

• Industrial control systems requiring robust digital isolation interfaces and reliable MCU processing.
• Battery-powered devices utilizing low-power modes and efficient power management features.
• Data acquisition applications leveraging the high-speed 12-bit ADC and multiple input channels.
• Embedded systems needing secure code execution with flash security options and unique identifiers.

Procurement Notes

Verify the specific suffix 'C-IUR' against the manufacturer's current ordering guide to confirm package type and temperature grade. Confirm RoHS compliance status as per the latest datasheet revision. Ensure compatibility with existing PCB footprints for the designated package option. Check for any obsolescence notices or recommended replacement parts due to the 'Not Recommended for New Designs' designation.

Selection Notes

Select this component when a cost-effective 8-bit solution with integrated analog peripherals is required. Consider the C8051F851 variant specifically for its balance of Flash memory and I/O count. Evaluate the -IUR suffix to ensure the correct industrial temperature range and surface-mount packaging are matched to the design requirements. Compare power consumption specifications across different clock speeds for optimal energy efficiency.

Part Context

This part belongs to the C8051F85x/86x family of low-cost 8-bit MCUs. These devices share a common architecture but differ in memory size and peripheral availability. The C8051F851 represents a specific configuration within this series, offering defined memory resources and interface options suitable for general-purpose embedded applications.

Replacement Considerations

The datasheet explicitly states this family is 'Not Recommended for New Designs'. Consult the official Silicon Labs documentation for qualified replacement parts or next-generation alternatives that offer improved performance or extended supply availability while maintaining pin and software compatibility.