NXP Semiconductors MCF5251VM140

Overview

MCF5251VM140 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 bandwidth. It supports CD, HDD, and USB-based portable and automotive audio players.

For engineers reviewing the MCF5251VM140 datasheet, MCF5251VM140 pinout, MCF5251VM140 application, or MCF5251VM140 equivalent, key selection considerations include its MAPBGA-225 package, dual FlexCAN 2.0B controllers, SDRAM interface supporting up to 32 MB, USB 2.0 OTG PHY, and dedicated audio interfaces compliant with IEC958, IIS, and SPDIF standards.

Technical Context

The MCF5251VM140 implements the Version 2 ColdFire (CF2) core with decoupled instruction fetch and operand execution pipelines, enabling 125+ Dhrystone 2.1 MIPS at 140 MHz. Its eMAC unit accelerates integer multiply-accumulate operations critical for audio signal processing.

It integrates a programmable PLL supporting 5–35 MHz crystal input, on-chip 1.2 V linear regulator (LINOUT), ATA/IDE host interface, three UARTs, dual I²C modules, QSPI, SD/MMC/Memory Stick interface, and six-channel 12-bit sigma-delta ADC - all managed via the System Integration Module (SIM).

Key Specifications

Pinout & Package

225-pin MAPBGA (13×13 mm, 0.8 mm pitch), lead-free, with thermal pad. Pin assignments validated per Freescale Document Number MCF5251 Rev. 3, Section 5.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCF5251CVM140, the MCF5251VM140 offers identical functionality at lower cost for commercial-temperature applications; compared with MCF5249VM120, it adds USB OTG, hardware MP3 decode, and 20 MHz higher clock margin - enabling richer multimedia features and faster data transfer.

Availability

MCF5251VM140 is available at Aetrix Electronics and suitable for portable audio players, automotive infotainment head units, USB audio dongles, and HDD-based media servers requiring stable component supply across production lifecycles.

Supply support for MCF5251VM140 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 embedded processors, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MCF5251VM140 belongs to the ColdFire V2 microprocessor family, designed specifically for cost-sensitive, low-power compressed audio systems where integration of control, signal processing, and peripheral interfacing is essential.

FAQ

What is the maximum SDRAM capacity supported by the MCF5251VM140?

The MCF5251VM140 supports up to 32 MB of external SDRAM via its 16-bit glueless SDRAM controller. This is achieved using a single bank with row/column addressing, and timing parameters are specified for 30–50 pF load conditions in the datasheet. The controller operates in page mode, non-page mode, and burst-page mode - all fully implemented in hardware without software overhead. MCF5251VM140's SDRAM interface requires no external logic for address multiplexing or refresh control.

Does the MCF5251VM140 include an integrated USB PHY?

Yes, the MCF5251VM140 integrates a full-speed USB 2.0 OTG PHY with dedicated USBDP/USBDN pins, USBVBUS detection, and USBID sensing. It does not require an external transceiver for basic USB device or host operation. The PHY supports both 12 Mbps (full-speed) and 1.5 Mbps (low-speed) modes, and is controlled entirely by the on-chip USB OTG controller. MCF5251VM140's USB implementation enables direct connection to PCs, flash drives, or other peripherals without additional silicon.

Can the MCF5251VM140 execute MP3 decode entirely from on-chip SRAM?

Yes, MP3 decode on the MCF5251VM140 runs entirely from the 128 KB on-chip SRAM - 64 KB for code/data and 64 KB for audio buffers - eliminating wait states and external memory dependencies. The hardware-accelerated MP3 decoder consumes less than 20 MHz of CPU bandwidth, leaving ample headroom for UI, file system, and peripheral tasks. This architecture is confirmed in the Freescale MCF5251 Data Sheet Rev. 3, Section 1.

What are the power supply requirements for the MCF5251VM140 core and I/O rails?

The MCF5251VM140 requires two primary supply domains: COREVDD (1.08–1.32 V, typ. 1.2 V) for the ColdFire core and PLL, and PADVDD/ADVDD (3.0–3.6 V, typ. 3.3 V) for I/O, analog, and USB sections. An internal 1.2 V linear regulator (LINOUT) generates the core voltage from a single 3.3 V input (LININ), simplifying power design. USBVDD (3.3 V) and USBVDDP (1.2 V) are also required for USB PHY operation. All specifications are detailed in Table 6 and Table 7 of the MCF5251VM140 datasheet.

Is the MCF5251VM140 pin-compatible with other ColdFire processors like the MCF5249 series?

No, the MCF5251VM140 is not pin-compatible with the MCF5249 series. It uses a 225-pin MAPBGA package with unique pin assignments for its enhanced peripheral set - including dual FlexCAN, USB PHY pins, dedicated IEC958 I/O, and expanded SDRAM interface signals. While both share the ColdFire V2 core architecture, differences in peripheral integration and signal mapping prevent mechanical or electrical drop-in replacement. MCF5251VM140's pinout is documented exclusively in Section 5.1 of its datasheet.