NXP Semiconductors MCF5281CVM66

Overview

MCF5281CVM66 from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V2 core microcontroller designed for industrial control and networked embedded systems. It operates at 66 MHz, integrates 128 KB on-chip Flash, 16 KB SRAM, a Fast Ethernet Controller (FEC), FlexCAN interface, and supports external SDRAM via its Synchronous DRAM Controller. It is used in programmable logic controllers (PLCs) requiring deterministic real-time I/O handling and network connectivity.

For engineers reviewing the MCF5281CVM66 datasheet, MCF5281CVM66 pinout, MCF5281CVM66 application, or MCF5281CVM66 equivalent, key selection considerations include its 66 MHz CPU frequency, integrated FEC with IEEE 802.3 MAC layer support, FlexCAN 2.0B compliance, QADC with 12-bit resolution and 16-channel multiplexing, and dual UARTs with IrDA support - all critical for industrial gateway and motion-control designs.

Technical Context

The MCF5281CVM66 implements the ColdFire V2 microarchitecture with a 3-stage pipeline, 4 KB instruction cache, and enhanced multiply-accumulate (EMAC) unit supporting fractional arithmetic. Its memory subsystem includes configurable chip select logic for NOR/NAND Flash, SRAM, and peripherals, plus a dedicated SDRAM controller supporting up to 128 MB of external memory with programmable timing.

System-level integration includes a Phase-Locked Loop (PLL) with selectable multiplication factors (1×–16×), dual interrupt controllers (INTC0/INTC1) supporting 64 vectored interrupts, and power management with five low-power modes (Run, Wait, Doze, Stop, Peripheral Shut Down). Debug is supported via IEEE 1149.1 JTAG and Background Debug Mode (BDM).

Key Specifications

Pinout & Package

The MCF5281CVM66 is housed in a 272-pin Fine-Pitch Ball Grid Array (FBGA) package with 17 × 17 array, 1.0 mm ball pitch, and standard JEDEC MO-251 mechanical outline. Thermal pad exposed on underside improves heat dissipation in convection-cooled enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with MCF5282CVM66, the MCF5281CVM66 omits one QSPI module and uses RMII-only FEC - reducing pin count and cost while retaining full industrial protocol support. Against K64F120M, it trades ARM ecosystem advantages for tighter integration of CAN, Ethernet MAC, and hardware-queued ADC - lowering BOM and layout complexity in established ColdFire-based platforms.

Availability

MCF5281CVM66 is available at Aetrix Electronics and suitable for industrial automation, building management systems, and remote telemetry applications requiring stable component supply and long-term lifecycle support.

Supply support for MCF5281CVM66 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with roots in Freescale's embedded processor heritage.

The MCF5281CVM66 belongs to the ColdFire V2 microcontroller family, engineered for deterministic real-time control in resource-constrained industrial environments where integrated Ethernet, CAN, and analog acquisition are essential.

FAQ

What is the maximum operating frequency of the MCF5281CVM66?

The MCF5281CVM66 operates at a maximum CPU frequency of 66 MHz, achieved via its internal PLL configured with an external 4–33 MHz crystal or oscillator. This yields 50.5 DMIPS performance, validated across temperature and voltage ranges per Freescale's MCF5282UM Rev. 3 specification. The MCF5281CVM66 maintains timing compliance under worst-case conditions when supplied with 1.5 V ±3% core voltage and 3.3 V ±5% I/O voltage.

Does the MCF5281CVM66 include an integrated Ethernet PHY?

No, the MCF5281CVM66 integrates only the Ethernet Media Access Controller (MAC) layer as part of its Fast Ethernet Controller (FEC); it requires an external PHY device connected via RMII interface. The MCF5281CVM66 provides MDIO/MDC signals for PHY register access and supports IEEE 802.3 10/100 Mbps operation, but does not contain physical layer circuitry. This separation allows design flexibility in selecting PHYs with specific ESD ratings or fiber interfaces.

How much on-chip Flash and SRAM does the MCF5281CVM66 provide?

The MCF5281CVM66 integrates 128 KB of on-chip Flash memory for program storage and 16 KB of on-chip SRAM for data and stack operations. Both memories are accessed directly by the ColdFire V2 core without wait states at 66 MHz. The Flash supports in-application programming (IAP) and sector protection via the ColdFire Flash Module (CFM), while SRAM retains data during low-power Wait and Doze modes.

What debug interfaces are supported by the MCF5281CVM66?

The MCF5281CVM66 supports IEEE 1149.1 JTAG boundary-scan testing and Background Debug Mode (BDM) for real-time in-circuit debugging. BDM provides non-intrusive breakpoints, watchpoints, and memory inspection without halting peripheral operation - critical for validating time-sensitive control loops. JTAG is used for manufacturing test and flash programming. Neither interface requires dedicated debug pins beyond the standard TDI/TDO/TCK/TMS/TRST ball assignments in the 272-pin FBGA package.

Is the MCF5281CVM66 pin-compatible with other ColdFire devices like the MCF5282CVM66?

Yes, the MCF5281CVM66 and MCF5282CVM66 share identical 272-pin FBGA packaging, mechanical footprint, and core signal mapping, enabling drop-in replacement in most PCB layouts. However, MCF5282CVM66 exposes additional QSPI signals and full MII Ethernet interface pins not present on MCF5281CVM66. Unused pins on MCF5281CVM66 must be left unconnected or tied appropriately per Freescale's MCF5282UM guidelines to ensure signal integrity.