NXP Semiconductors MCF5271CAB100

Overview

MCF5271CAB100 from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V2 RISC microprocessor in 160-pin QFP package, operating at 100 MHz with 144 Dhrystone 2.1 MIPS performance. It integrates a 10/100 Fast Ethernet MAC, 64 KB on-chip SRAM, 8 KB configurable instruction/data cache, and SDR SDRAM controller - deployed in industrial gateways requiring deterministic real-time connectivity and local protocol bridging.

For engineers reviewing the MCF5271CAB100 datasheet, MCF5271CAB100 pinout, MCF5271CAB100 application, or MCF5271CAB100 equivalent, key selection criteria include Ethernet PHY interface mode (MII vs. serial), SDRAM timing compliance, ColdFire V2 core debug via BDM/JTAG, and thermal derating for extended temperature (-40°C to +85°C) operation.

Technical Context

The MCF5271CAB100 implements the ColdFire V2 core with enhanced multiply-accumulate (eMAC) unit and hardware divide logic. Its memory subsystem includes a 32-bit SDR SDRAM controller supporting synchronous burst reads/writes, configurable CAS latency, and automatic refresh control via SD_CKE, SD_SRAS, and SD_SCAS signals.

Peripheral integration includes three UARTs (U0–U2), dual I²C interfaces (I2C_SDA/I2C_SCL), quad SPI (QSPI_CS0–QSPI_CS1, QSPI_CLK, QSPI_DIN/DOUT), four DMA timers (DT0–DT3), and dual interrupt controllers (INTC0/INTC1). The FEC supports both IEEE 802.3 MII (18-signal) and 7-wire AMD serial modes, selected by R_CNTRL[MII_MODE].

Key Specifications

Pinout & Package

Package: 160-pin Plastic Quad Flat Package (QFP), 28 mm × 28 mm body, 0.65 mm pitch, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit industrial microprocessor applications.

Compared with MCF5271CVM100, the MCF5271CAB100 offers easier prototyping and rework via QFP, while MCF5272CAB100 adds USB 2.0 OTG and doubles SRAM - making it suitable for applications needing local mass storage or richer HMI asset caching.

Availability

MCF5271CAB100 is available at Aetrix Electronics and suitable for industrial gateways, secure HMIs, PLC base units, and building automation controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MCF5271CAB100 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 acquired Freescale in 2015 and maintains full support for the ColdFire portfolio, including documentation, reference designs, and long-term supply commitments for industrial microprocessors.

The MCF5271CAB100 belongs to the ColdFire V2 microprocessor family, designed specifically for cost-sensitive, high-integration industrial networking applications requiring deterministic real-time performance, Ethernet connectivity, and hardware-accelerated security.

FAQ

What is the maximum SDRAM capacity supported by the MCF5271CAB100?

The MCF5271CAB100 supports up to 256 MB of SDR SDRAM using its 21-bit address bus (A[20:0]) and configurable bank addressing. The SDRAM controller implements standard JEDEC timing parameters including tRCD, tRP, and tRC, and supports programmable CAS latency (CL=2 or CL=3) to match commercial-grade SDRAM parts.

Does the MCF5271CAB100 support JTAG debugging out-of-the-box?

Yes, the MCF5271CAB100 supports IEEE 1149.1 JTAG debugging via pins TMS, TDI, TDO, TCK, and TRST/DSCLK. JTAG functionality is enabled by asserting JTAG_EN; otherwise, these pins default to GPIO. The integrated BDM interface allows full-cycle accurate breakpoints and register inspection without requiring external debug probes beyond standard BDM cables.

Can the MCF5271CAB100 operate with an external 25 MHz oscillator instead of a crystal?

Yes, the MCF5271CAB100 accepts a single-ended CMOS-level clock signal on the EXTAL pin, with XTAL left unconnected or tied to ground. The internal PLL locks to the external clock and generates the 100 MHz core clock. This configuration simplifies layout and improves jitter immunity compared to crystal-based oscillators in electrically noisy industrial environments.

How does the hardware encryption module in the MCF5271CAB100 function?

The MCF5271CAB100 includes a dedicated cryptographic accelerator supporting AES-128/192/256 (ECB/CBC modes), SHA-1, and SHA-256. It operates independently of the CPU via DMA transfers, enabling concurrent encryption/decryption while the ColdFire core executes application code - critical for maintaining real-time responsiveness during secure communications.

What are the power supply sequencing requirements for reliable startup of the MCF5271CAB100?

The MCF5271CAB100 requires OVDD and VDD to track within 0.4 V during ramp-up, with recommended 1 ms or slower rise time. VDD and OVDD/VDDPLL should rise together to 0.9 V, then separate to final voltages (VDD = 1.5 V, OVDD = 3.3 V). Violating this sequence risks ESD diode conduction and potential latch-up, especially during cold-start conditions.