C8051T326-GM

Overview

The C8051T326-GM is an 8-bit microcontroller from Silicon Labs, part of the C8051T32x/7 family. It features a high-speed CIP-51 core with up to 48 MIPS throughput at 48 MHz. The device includes 16 kB byte-programmable EPROM and 1280 bytes of internal data RAM. It integrates a full-speed USB 2.0 function controller with an integrated transceiver and clock recovery, supporting six flexible endpoints and 256-byte buffer memory. Digital peripherals include two enhanced UARTs, hardware-enhanced SPI, SMBus, four 16-bit timers, and a 16-bit PCA. The unit operates on a supply voltage of 1.8 to 5.25 V and is available in a 28-QFN package.

Feature Summary

• Integrates a full-speed USB 2.0 function controller with an on-chip transceiver and clock recovery, eliminating the need for external components.
• Features a high-speed pipelined 8051-compatible core capable of executing 70% of instructions in one or two system clocks.
• Includes non-intrusive on-chip debug circuitry that supports breakpoints, single stepping, and memory inspection without interrupting normal operation.
• Provides flexible port I/O configuration via a priority crossbar decoder, allowing digital and analog functions to be assigned to specific pins.

Applications

• USB-enabled embedded systems requiring direct connectivity
• Industrial control devices utilizing serial communication interfaces
• Portable instrumentation with low-power requirements

Procurement Notes

Verify the exact ordering suffix against the manufacturer's current documentation to ensure correct package type and temperature rating. Confirm component status as active or obsolete prior to design finalization. Cross-reference the datasheet revision to ensure all electrical characteristics and timing parameters match the specific production batch requirements.

Selection Notes

Select this component when a mixed-signal MCU with native USB functionality is required without external PHY components. Consider the EPROM memory type for applications needing firmware reprogrammability from within the system. Evaluate the 1.8V to 5.25V operating range against the target power supply architecture and ensure the 28-pin QFN package fits the mechanical constraints.

Part Context

This device belongs to the C8051T32x/7 series of USB microcontrollers from Silicon Labs. These parts are designed as complete system-on-chip solutions, combining the processing core with necessary analog and digital peripherals. The series emphasizes ease of integration for USB applications by removing external passive components typically required for bus transceivers and clock generation.

Replacement Considerations

Consult the official datasheet for confirmed substitute part numbers within the same family or series. Verify pin compatibility and peripheral availability before substituting. Do not assume functional equivalence across different silicon generations without detailed specification comparison.

FAQ

Does the C8051T326 require an external crystal for USB operation?

No, the device features an internal oscillator with clock recovery capability that supports full-speed and low-speed USB operation without an external crystal.

What is the maximum instruction execution speed of the core?

The CIP-51 core can achieve up to 48 MIPS throughput when driven by a 48 MHz clock source.

How is the program memory programmed?

The 16 kB EPROM code memory can be programmed via the C2 interface or through in-application programming (IAP) using firmware running on the device itself.