NXP Semiconductors MCF51JU64VLF

Overview

MCF51JU64VLF from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V1 microcontroller with 64 KB on-chip flash, 12-bit ADC/DAC, USB On-The-Go controller, and 48 EGPIO pins. It operates from 1.71 V to 3.6 V across –40°C to 105°C, supports up to 50 MHz CPU frequency, and integrates FlexNVM, Mini-FlexBus, and low-power timers for industrial control and embedded HMI applications.

For engineers reviewing the MCF51JU64VLF datasheet, MCF51JU64VLF pinout, MCF51JU64VLF application, or MCF51JU64VLF equivalent, key selection considerations include its 48-pin LQFP package, -40°C to 105°C extended temperature rating, integrated USB transceiver, 10 low-power modes, and compatibility with ColdFire DEBUG_Rev_B+ single-wire BDM debugging.

Technical Context

The MCF51JU64VLF implements the ColdFire V1 core with Dhrystone 2.1 performance of 0.99 DMIPS/MHz when executing from flash and includes a multipurpose clock generator (MCG) supporting crystal oscillators at 1 kHz–32 MHz. Its system architecture integrates DMA with four channels, hardware CRC, and a low-leakage wakeup unit (LLWU) for deterministic low-power operation.

Analog subsystems include a 12-bit SAR ADC with configurable sample time, a 12-bit DAC with buffered output, and an analog comparator with internal 6-bit DAC reference. Communication interfaces comprise three UARTs (one with Smart Card support), two SPI modules (one with FIFO), two I²C modules, USB full/low-speed OTG with on-chip transceiver, and I²S/SAI for AC97/CODEC audio interfacing.

Key Specifications

Pinout & Package

Package: 48-pin LQFP (7 mm × 7 mm), lead-free, RoHS-compliant, with exposed thermal pad (pin 48 = VSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with K22FN512VLH12, MCF51JU64VLF offers lower system-level BOM cost via integrated USB PHY and smaller footprint, while MCF51JM128VLF provides drop-in flash scalability without changing PCB layout or driver stack.

Availability

MCF51JU64VLF is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, medical patient monitors, and automotive body control modules requiring stable component supply over extended product lifecycles.

Supply support for MCF51JU64VLF 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 legacy expertise in ColdFire and S12X architectures.

The MCF51JU64VLF belongs to the ColdFire JU-series microcontrollers designed specifically for cost-sensitive, low-power embedded applications demanding mixed-signal integration, USB connectivity, and extended temperature operation in harsh environments.

FAQ

What is the maximum operating frequency of the MCF51JU64VLF CPU core?

The MCF51JU64VLF features a ColdFire V1 core rated for up to 50 MHz system and core clock frequency. This is achievable under full voltage (3.0–3.6 V) and temperature (–40°C to 105°C) conditions with appropriate clock source configuration via the multipurpose clock generator (MCG). At lower voltages (e.g., 1.8 V), the maximum frequency is reduced per the device's voltage-frequency scaling specification.

Does the MCF51JU64VLF include an integrated USB transceiver?

Yes, the MCF51JU64VLF includes a full/low-speed USB On-The-Go controller with an integrated transceiver. This eliminates the need for external USB PHY components, simplifies PCB layout, and ensures compliance with USB 2.0 electrical specifications. The USB_DP and USB_DM pins connect directly to the USB connector with only recommended series resistors and ESD protection.

What package type and pin count does the MCF51JU64VLF use?

The MCF51JU64VLF uses a 48-pin LQFP package (7 mm × 7 mm) with an exposed thermal pad (pin 48 = VSS). This package is RoHS-compliant, lead-free, and optimized for automated assembly. Pin assignments support multiplexed functions including EGPIO, UART, SPI, I²C, ADC inputs, and USB signals - all documented in Section 8 of the official datasheet.

How many low-power modes does the MCF51JU64VLF support, and what is the lowest current draw?

The MCF51JU64VLF supports 10 distinct low-power modes, including VLLS1–VLLS3. In VLLS1 mode at 3.0 V and –40°C to 25°C ambient, the typical current draw is 1.4 μA. At 105°C, it rises to 2.6 μA. These ultra-low currents are enabled by the low-leakage wakeup unit (LLWU) and selective clock gating - making the MCF51JU64VLF suitable for battery-backed RTC and wake-on-event applications.

Is the MCF51JU64VLF pin-compatible with other members of the MCF51JU family?

No, the MCF51JU64VLF is not universally pin-compatible across the MCF51JU family. While it shares the 48-pin LQFP (VLF) package with MCF51JU64VHS and MCF51JU32VHS, it differs from 64-pin (VLH) and 44-pin (VHS) variants. Within the VLF package group, pinouts are consistent for shared signals, but memory size differences (32 KB vs. 64 KB vs. 128 KB) do not affect pin mapping - enabling hardware reuse where flash requirements permit.