C8051F850-C-GUR

Overview

The C8051F850-C-GUR is a discontinued 8-bit mixed-signal microcontroller from Silicon Labs, part of the C8051F85x family. It features a high-speed CIP-51 core operating at up to 25 MHz with standard 8051 instruction set compatibility. The device integrates 8 kB of in-system programmable Flash memory and 512 bytes of RAM (256 + 256). Key peripherals include a 12-bit ADC with up to 16 channels, two analog comparators, four 16-bit timers, and communication interfaces such as UART, SPI, and I2C/SMBus. It operates on a 2.2 V to 3.6 V supply and is housed in a 24-pin QSOP package.

Feature Summary

• High-performance pipelined CIP-51 core delivering up to 25 MIPS throughput while maintaining full MCS-51 instruction set compatibility.
• Integrated mixed-signal capabilities featuring a 12-bit ADC with up to 16 input channels and two low-current analog comparators.
• Flexible digital I/O architecture utilizing a priority crossbar decoder for dynamic peripheral-to-pin mapping.
• On-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators.

Applications

• Battery chargers
• Electronic toys and games
• Motor control systems
• Optical communications

Procurement Notes

This component is officially marked as Not Recommended for New Designs and has been discontinued by the manufacturer. Verification of current availability requires checking authorized distributors for remaining stock or obsolete inventory. Engineers must confirm end-of-life status and lead times carefully before finalizing any procurement plans.

Selection Notes

Designers should evaluate this MCU for legacy system maintenance or cost-sensitive applications where the 8051 architecture is already established. Consider the limited pin count and specific peripheral mix against modern alternatives if new development is required. Verify that the 24-pin QSOP package fits the existing PCB footprint constraints.

Part Context

The C8051F850 belongs to the C8051F85x/86x family of low-cost 8-bit MCUs designed as complete system-on-chip solutions. These devices combine a fast microcontroller core with extensive analog and digital peripherals, reducing the need for external components. The family supports various packages including QFN, SOIC, and QSOP to accommodate different form factor requirements.

Replacement Considerations

Silicon Labs lists EFM8BB51F8G-C-TSSOP20R as a verified substitute part number for this component.