MCF51MM256VMB - 32-bit ColdFire V1 MCU, 256KB Flash 50MHz | NXP
料号： MCF51MM256VMB ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.71 | $8.71 |
| 10 | $8.36 | $83.60 |
| 100 | $7.92 | $792.00 |
| 500 | $7.55 | $3,775.00 |
| 1,000 | $7.2 | $7,200.00 |
MCF51MM256VMB 概述
A microcontroller unit (MCU) is a single-chip embedded computer that integrates a processor core, program memory, data memory, and peripheral functions on one die. Within the embedded systems hierarchy, the MCU sits below microprocessors in raw compute power but above discrete logic in integration, making it the workhorse of cost-sensitive, low-power control applications. The ColdFire V1 core from Freescale (now NXP) is a 32-bit architecture derived from the 68000 family, offering a favorable code-density and price point for handheld and metering products.
Key features of the MCF51MM256VMB include 256KB of on-chip flash program memory organized as 256K x 8, 32KB of RAM, and a rich connectivity set covering CANbus, external bus interface (EBI/EMI), I2C, SCI (UART), SPI, and USB On-The-Go. Peripheral functions include pulse-width modulation (PWM), a low-voltage detector (LVD), and a watchdog timer (WDT). The external oscillator type allows designers to choose precision clock sources for metering accuracy.
Architecturally, the device belongs to the low-cost, low-power, high-performance ColdFire V1 family explicitly designed for handheld metering devices, where battery life, integrated USB OTG for firmware updates, and CAN interfaces for utility networks are decisive. The 50MHz core speed provides sufficient headroom for metrology DSP-style computations while retaining single-supply low-power operation.
Typical applications include smart electricity, water, and gas meters, handheld data-collection terminals, industrial instrumentation front ends, and battery-powered equipment requiring USB connectivity for field servicing.
When designing with this part, note the lifecycle status: NXP lists the MCF51MM series as obsolete, so new designs should evaluate the available stock through authorized distributors or last-time-buy channels, and legacy designs should secure inventory or qualify a successor.
This page synthesizes distributor pricing, same-family drop-in alternatives, and sourcing-risk guidance not found in the manufacturer datasheet, giving engineers a single decision-ready reference as of 2026-10-18.
直接替换替代料： MCF51MM256VMB ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MCF51MM256VMB （相同外形与封装尺寸） ——差异在于 Connectivity, Package, Product Type, CPU Core, Communication Interfaces.
快速对比工具——选择替代料号进行并排对比：
MCF51MM128VMB
✅ 直接替换✓ 有现货
$11.0968 / 个
查看数据手册 →MCF51JE256VMB
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →MCF51MM256VMB 最大额定值与电气特性
| Core Processor | ColdFire V1 |
| Core Size | 32-bit |
| Maximum Clock Speed | 50 MHz |
| Program Memory Size | 256 KB (256K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 32K x 8 |
| Connectivity | CANbus, EBI/EMI, I2C, SCI, SPI, USB OTG |
| Peripherals | LVD, PWM, WDT |
| Number of I/O | 48 |
| Oscillator Type | External |
| 封装 / 外壳 | 81-MAPBGA (10x10 mm) |
| 安装类型 | Surface Mount |
| Packaging | Tray |
| Series | MCF51MM |
| Part Status | Obsolete |
| Supplier Device Package | 81-BGA |
MCF51MM256VMB 81-bga 引脚配置指南
MCF51MM256VMB（81-bga 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： MCF51MM256VMB.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MCF51MM256VMB 适用于 6 应用s: Handheld Metering Terminals, Smart Electricity Meters, Industrial Instrumentation, Battery-Powered Data Collectors, Building Automation Nodes, Medical Portable Diagnostic Devices.
Handheld Metering Terminals
The MCF51MM256VMB was purpose-built by Freescale/NXP for handheld metering devices. Its 50MHz ColdFire V1 core executes metrology algorithms with margin, while 256KB flash stores firmware plus tariff and billing tables and 32KB RAM buffers measurement sessions. USB On-The-Go enables direct field connection to laptops for data retrieval and firmware updates without extra bridge circuitry, and the external oscillator supports precision timing for energy-accuracy requirements. In this role the MCU integrates the entire control path - measurement sequencing via SPI-connected front ends, CAN or SCI communication to utility infrastructure, and low-power standby between readings, extending battery service intervals in field instruments.
推荐
Smart Electricity Meters
For residential and commercial electricity meters, the MCF51MM256VMB combines the three interfaces metering platforms need: CANbus for utility network communication, SCI UARTs for maintenance ports, and SPI/I2C for metering front-end ICs. The 256KB flash accommodates multi-tariff firmware, load-profile logging, and secure OTA-style update staging through USB OTG during factory or field programming. Its external oscillator input lets designers meet grid-timing accuracy class requirements with a temperature-compensated clock source. The low-voltage detector and watchdog timer provide the fail-safe behavior utilities expect, resetting the meter deterministically on brownout or firmware lockup events rather than allowing erroneous billing data.
推荐
Industrial Instrumentation
In portable and panel industrial instruments, the MCF51MM256VMB provides a 32-bit compute headroom advantage over 8-bit legacy MCUs at comparable cost. The external bus interface (EBI/EMI) allows direct attachment of parallel-bus display drivers or memory-mapped peripherals, while the 48 I/O lines handle keypad matrices, indicator outputs, and status inputs without expansion logic. CANbus integration connects the instrument to factory networks for condition monitoring, and SPI links to precision ADCs such as the CS5531 handle transducer signals. At 50MHz the core performs linearization, filtering, and calibration math in fixed point comfortably, and the 32KB RAM supports data logging between communication sessions in battery-backed designs.
推荐
Battery-Powered Data Collectors
Handheld data-collection terminals benefit from the MCF51MM family balance of performance and low power. The 50MHz ColdFire V1 core completes burst processing tasks quickly, allowing the MCU to return to low-power standby modes for most of the operating cycle - a pattern that dominates battery life in handheld use. USB OTG removes dock hardware: field operators sync readings directly to a PC or tablet through a standard cable. The 256KB flash retains collected records across battery swaps, and SCI/I2C links serve barcode or RFID front-end modules. The low-voltage detector warns of impending shutdown so the terminal can commit data structures safely before power loss.
推荐
Building Automation Nodes
The MCF51MM256VMB suits building-automation control nodes where CAN or SCI backbones connect sensors, actuators, and supervisory controllers. Its 48 I/O drive relays, valves, and damper signals directly through external drivers, while SPI-connected ADCs digitize temperature, humidity, and pressure sensor inputs. The 256KB flash stores protocol stacks and local control logic, and I2C handles configuration EEPROMs and real-time clocks. The watchdog timer guarantees that a stalled node recovers without technician intervention - essential in HVAC and access-control installations. Battery- or PoE-backed nodes also benefit from the LVD, which sequences a safe shutdown as supply voltage decays during outages.
推荐
Medical Portable Diagnostic Devices
Portable diagnostic instruments such as glucose meters and handheld vital-sign monitors fit the MCF51MM256VMB profile: low power for long battery sessions, a 32-bit core for signal processing, and USB OTG for uploading patient records to clinic systems. SPI-connected precision ADCs such as the PCM4202 or CS5531 acquire biosensor signals whose processing benefits from the 50MHz core's headroom. The 32KB RAM buffers session data, and 256KB flash holds calibration tables and patient-history records between uploads. The external oscillator supports the precise sample timing that medical measurement accuracy demands, while the watchdog provides the deterministic fault recovery expected in point-of-care equipment.
推荐
推荐产品汇总
工程参考数据： MCF51MM256VMB ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MCF51MM128VMB | MCF51JE256VMB |
|---|---|---|---|
| Package | 81-MAPBGA (10x10 mm) | 81-MAPBGA (10x10 mm) - same | 81-MAPBGA (10x10 mm) - same |
| Brand | NXP (Freescale) | NXP (Freescale) | NXP (Freescale) |
| Core | ColdFire V1, 32-bit | ColdFire V1, 32-bit | ColdFire V1, 32-bit |
| Max Clock Speed | 50 MHz | 50 MHz | 50 MHz |
| Program Flash | 256 KB | 128 KB | 256 KB |
| Lifecycle Status | Obsolete | Obsolete | Obsolete |
关键差异点
- Double the program flash for feature-rich meter firmware （对比 MCF51MM128VMB)
- Metering-optimized peripheral set with USB OTG （对比 MCF51JE256VMB)
- Obsolescence is the honest trade-off （对比 Active NXP Cortex-M MCUs)
设计说明
The MCF51MM256VMB is obsolete: NXP no longer manufactures it, and remaining supply flows through aftermarket sources (Heisener reported 2,192 pieces as of 2026-10-18; Rochester Electronics carries legacy stock). Before committing a production build, confirm lot date codes and request certificate of conformity from the broker, since obsolete parts carry elevated counterfeit risk. For sustaining designs, initiate a last-time-buy sized to expected field-service demand, and in parallel evaluate migration to NXP Kinetis or LPC Cortex-M families for the next board revision.
The 81-MAPBGA (10x10 mm) package requires a 0.8 mm-pitch BGA land pattern with via-in-pad or dog-bone fanout on inner rows. Escape routing the 48 I/O plus power balls typically needs at least four layers. Follow the land pattern in the NXP MCF51MM256 datasheet mechanical drawing, and specify NSMD pads for reliable solder joints. BGA rework demands X-ray inspection capability - plan inspection coverage in your manufacturing flow, since solder bridges under the package are invisible optically.
The device uses an external oscillator, so clock integrity depends on PCB layout: keep the oscillator loop short, guard it with ground, and isolate it from switching noise of CAN transceivers and USB PHY circuitry. Decouple all VDD balls with 100 nF ceramics placed on the BGA fanout layer, plus bulk capacitance near the supply entry. The low-voltage detector (LVD) should be enabled in firmware so brownout events trigger a deterministic reset rather than flash corruption - important for meters that must never lose billing data.
合规信息
Compliance data was not present in the provided web data. As an obsolete part, original RoHS declarations should be requested from NXP legacy product services or Rochester Electronics.