NXP Semiconductors MCF5251CVM140

Overview

MCF5251CVM140 from Freescale Semiconductor is a 32-bit ColdFire V2 microprocessor designed as a system controller/decoder for compressed audio playback systems, featuring a 140 MHz CPU core, integrated 128 KB on-chip SRAM (64 KB × 2 banks), and hardware-accelerated MP3 decode requiring <20 MHz CPU bandwidth. It supports automotive and portable CD/HDD/USB-based music players with dual FlexCAN 2.0B controllers, USB 2.0 OTG, ATA/IDE, SDRAM, and IEC958/SPDIF audio interfaces.

For engineers reviewing the MCF5251CVM140 datasheet, MCF5251CVM140 pinout, MCF5251CVM140 application, or MCF5251CVM140 equivalent, this page delivers verified technical context, package mapping to 225-pin MAPBGA, confirmed peripheral integration (eMAC, dual CAN, USB OTG, ATA, SD/MMC), real-world timing constraints (BCLK = 7.14 ns cycle, PSTCLK = 7 ns), and validated alternative options for audio system controller replacement.

Technical Context

The MCF5251CVM140 implements the ColdFire Version 2 (CF2) core with decoupled instruction fetch and operand execution pipelines, enabling high code density and signal processing efficiency. Its eMAC unit accelerates integer multiply-accumulate operations critical for MP3 decoding and audio filtering.

System-level integration includes a programmable PLL supporting 5–33.86 MHz crystal input, on-die 1.2 V linear regulator (LINOUT) with 100 mA output, and multiplexed GPIO enabling flexible peripheral assignment-including SDRAM interface (16-bit bus, up to 32 MB), dual I²C, three UARTs, and QSPI with queued transfers.

Key Specifications

Pinout & Package

225-pin MAPBGA (13×13 array, 0.8 mm pitch), RoHS-compliant, lead-free finish. Pin functions mapped per Freescale Document Number MCF5251 Rev. 3 (pages 19–24).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar audio system controller applications.

Compared with MCF5251VM140, the CVM140 variant adds extended temperature qualification (–40°C to +85°C) without functional or pinout changes. Against i.MX27, it trades video capability and ARM ecosystem for ColdFire-optimized audio throughput, lower thermal design power, and direct MP3 hardware acceleration.

Availability

MCF5251CVM140 is available at Aetrix Electronics and suitable for automotive infotainment head units, portable HDD-based music players, USB audio docking stations, and CD-ROM media hubs requiring stable component supply across extended temperature ranges.

Supply support for MCF5251CVM140 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

Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in microcontrollers, processors, and analog solutions for automotive, industrial, and consumer markets.

The MCF5251 belongs to the ColdFire V2 microprocessor family, designed specifically for cost-sensitive, low-power embedded audio systems requiring integrated decode acceleration, mixed-signal peripherals, and automotive-grade reliability.

FAQ

What is the maximum SDRAM capacity supported by the MCF5251CVM140?

The MCF5251CVM140 SDRAM controller supports up to 32 MB of external memory using a 16-bit data bus. It operates in page mode, non-page mode, and burst-page mode, and is designed for standard SDRAM components compliant with JEDEC specifications. This capacity is sufficient for buffering large audio files and running real-time decode firmware alongside file system operations in the MCF5251CVM140-based system.

Does the MCF5251CVM140 include a hardware MP3 decoder?

Yes, the MCF5251CVM140 integrates a hardwired CD-ROM decoder and supports MP3 decode requiring less than 20 MHz of CPU bandwidth when executed from on-chip SRAM. While not a fully autonomous "MP3 ASIC," its eMAC unit and optimized ColdFire V2 core enable highly efficient software-based MP3 decoding - a key differentiator for audio-focused applications. This capability is documented in the MCF5251 data sheet (Rev. 3, Section 1) and confirmed in Freescale's application notes for compressed audio systems.

What are the power supply requirements for the MCF5251CVM140 core and I/O rails?

The MCF5251CVM140 requires two primary supply domains: COREVDD (1.08–1.32 V, typical 1.2 V) for the CPU core and PLL, and PADVDD/ADVDD (3.0–3.6 V, typical 3.3 V) for I/O, analog, and USB sections. An internal 1.2 V linear regulator (LINOUT) generates the core voltage from a 3.3 V LININ input, eliminating the need for an external LDO. All supply rails must be decoupled per Freescale's layout guidelines to ensure stable operation at 140 MHz.

Is the MCF5251CVM140 pin-compatible with other ColdFire processors like the MCF5223x series?

No, the MCF5251CVM140 is not pin-compatible with the MCF5223x series or other ColdFire families. It uses a unique 225-pin MAPBGA package with signal assignments specific to its integrated peripherals - including dual FlexCAN, USB OTG PHY, ATA/IDE, and SDRAM interfaces - which differ significantly from the QFP or smaller BGA packages of earlier ColdFire variants. Board redesign is required when migrating to or from the MCF5251CVM140.

What debug interfaces does the MCF5251CVM140 support?

The MCF5251CVM140 supports both JTAG (IEEE 1149.1A compliant) and Background Debug Mode (BDM) interfaces for development and production testing. The DDATA/PST/PSTCLK debug interface provides real-time processor status capture and breakpoint control, while the TCK/TMS/TDO/TDI pins implement full boundary-scan functionality. These interfaces are electrically defined in Table 15 (DDATA/PST timing) and Table 16 (BDM timing) of the MCF5251 data sheet Rev. 3.