NXP Semiconductors MCF5281CVM66J

Overview

MCF5281CVM66J from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V2 core microcontroller featuring 66 MHz CPU operation, 128 KB on-chip Flash memory, and 16 KB SRAM. It integrates FlexCAN, QSPI, UARTs, I²C, QADC, FEC Ethernet controller, and programmable timers - designed for real-time industrial control and networked embedded systems.

For engineers reviewing the MCF5281CVM66J datasheet, MCF5281CVM66J pinout, MCF5281CVM66J application, or MCF5281CVM66J equivalent, key selection considerations include its 66 MHz ColdFire V2 execution speed, 128 KB Flash with security protection, integrated Fast Ethernet Controller, FlexCAN 2.0B compliance, and 208-pin LQFP package with configurable peripheral multiplexing.

Technical Context

The MCF5281CVM66J implements the ColdFire V2 microarchitecture with a 5-stage pipeline, 4 KB instruction/data unified cache, and enhanced MAC unit supporting fractional arithmetic. It executes ISA_A+ instructions with cycle-accurate timing for deterministic real-time response.

Its system-level integration includes a Phase-Locked Loop (PLL) clock generator supporting 1× to 16× multiplication of external crystal input, dual interrupt controllers (INTC0/INTC1), and a System Control Module (SCM) managing bus arbitration, privilege levels, and reset supervision.

Key Specifications

Pinout & Package

208-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad; 0.5 mm lead pitch; 28 mm × 28 mm body size; JEDEC MO-220 standard compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCF5281CVM66J, the MCF5282CVM66J offers expanded memory and retained pin compatibility for drop-in upgrades, while the K60DN512ZVMD10 provides higher performance at the cost of architectural discontinuity and peripheral redesign effort.

Availability

MCF5281CVM66J is available at Aetrix Electronics and suitable for industrial PLCs, building automation gateways, energy meter concentrators, and smart grid RTUs requiring stable component supply and long-term lifecycle support.

Supply support for MCF5281CVM66J 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The MCF5281CVM66J belongs to the ColdFire V2 microcontroller family, engineered for deterministic real-time control in resource-constrained industrial environments with integrated networking and analog signal conditioning.

FAQ

What is the maximum operating frequency of the MCF5281CVM66J?

The MCF5281CVM66J operates at a maximum CPU frequency of 66 MHz, achieved via its internal Phase-Locked Loop (PLL) that multiplies an external crystal input (typically 8–16 MHz). This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3 V ±0.3 V supply, enabling hard real-time response for control loops and communication stacks. The MCF5281CVM66J's timing specifications are validated per Freescale's MCF5282UM Rev. 3 documentation.

Does the MCF5281CVM66J include an integrated Ethernet controller?

No, the MCF5281CVM66J does not integrate a Fast Ethernet Controller (FEC). That feature is present in the pin-compatible MCF5282CVM66J variant. The MCF5281CVM66J retains all other peripherals - FlexCAN, QSPI, UARTs, I²C, QADC, and timers - but omits the FEC block. Engineers selecting the MCF5281CVM66J must implement Ethernet connectivity externally via SPI- or parallel-interface PHYs. This distinction is explicitly documented in Section 1.2 of the MCF5282UM user manual.

What package type and pin count does the MCF5281CVM66J use?

The MCF5281CVM66J is housed in a 208-pin Low-Profile Quad Flat Package (LQFP) with 0.5 mm lead pitch and 28 mm × 28 mm body dimensions. It features an exposed thermal pad on the underside for enhanced heat dissipation. This package is mechanically and electrically identical to the MCF5282CVM66J, enabling direct PCB footprint reuse. Pin assignments are defined in Chapter 14 ("Signal Descriptions") of the MCF5282UM reference manual.

How much on-chip Flash and SRAM does the MCF5281CVM66J provide?

The MCF5281CVM66J integrates 128 KB of on-chip Flash memory and 16 KB of on-chip SRAM. The Flash supports sector erase, program/verify operations, and security lock bits (CFMSEC register) to prevent unauthorized access. The SRAM operates at zero wait states across the full operating range. These memory capacities are fixed for this variant and confirmed in Table 1-1 ("Device Comparison") of the MCF5282UM Rev. 3 document.

Is the MCF5281CVM66J supported by modern development tools?

Yes, the MCF5281CVM66J is supported by legacy CodeWarrior Development Studio for ColdFire v6.3 and newer versions of SEGGER Embedded Studio with ColdFire V2 target configuration. NXP maintains archived toolchains and reference BSPs for this device. While new ARM-based NXP platforms receive primary tool investment, the MCF5281CVM66J remains fully debuggable via JTAG/BDM interfaces using standard OpenOCD and GDB workflows. Documentation and drivers are accessible through NXP's official archive portal.