C8051F861-C-GSR

Overview

The C8051F861-C-GSR 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 integrates 8 kB of in-system programmable Flash memory and 512 Bytes of RAM (256 + 256). The device includes a 12-bit ADC with up to 16 input channels, two analog comparators, and communication peripherals such as UART, I2C/SMBus, and SPI. Operating voltage ranges from 2.2 V to 3.6 V, with commercial temperature support from -40 °C to +85 °C.

Feature Summary

• High-Speed CIP-51 Core: Pipelined architecture delivering up to 25 MIPS at 25 MHz using standard 8051 instruction set.
• On-Chip Debug Circuitry: Facilitates full-speed, non-intrusive in-system debug without external emulators.
• Integrated Analog Peripherals: Includes a 12-bit ADC with up to 16 channels and two low-current analog comparators.
• Communication Interfaces: Supports UART, I2C/SMBus, and SPI for versatile data exchange.

Applications

• Industrial control systems requiring robust 8-bit processing
• Low-cost embedded applications needing integrated analog capabilities
• Battery-powered devices utilizing low-power oscillators
• Systems requiring on-chip debugging and flash programming

Procurement Notes

Verify the specific suffix 'C-GSR' against the manufacturer's current ordering guide to confirm package type (SOIC-16) and tape/reel quantity. Confirm RoHS compliance status as datasheets may vary by revision. Check for 'Not Recommended for New Designs' status which may impact long-term availability. Ensure supply voltage requirements match your system design before procurement.

Selection Notes

Select this component when a cost-effective 8-bit MCU with integrated analog features is required. The CIP-51 core offers compatibility with existing 8051 codebases while providing higher performance. Consider the 16-pin SOIC package for space-constrained designs. Evaluate power consumption in Idle and Stop modes if battery life is critical. Ensure the 2.2 V to 3.6 V operating range aligns with your power supply constraints.

Part Context

The C8051F861-C-GSR belongs to the C8051F85x/86x series, designed for low-cost, high-performance embedded applications. This family combines a fast 8051-compatible core with significant on-chip resources, reducing external component count. The C861 variant specifically offers 8 kB Flash and 512 Bytes RAM, targeting applications that balance processing power with peripheral integration.

Replacement Considerations

Check for direct pin-to-pin replacements within the C8051F85x/86x family with different memory sizes. Verify software compatibility if migrating between variants with differing peripheral counts or register maps. Consult the manufacturer's obsolescence notices for end-of-life status and recommended alternative part numbers.

FAQ

What is the maximum system clock frequency for the C8051F861?

The maximum system clock frequency is 25 MHz, allowing for up to 25 MIPS throughput.

Does the C8051F861 support in-system programming?

Yes, the Flash memory is in-system programmable in 512-Byte sectors.

How many analog input channels are available on the ADC?

The device supports up to 16 input channels for the 12-bit Analog-to-Digital Converter.