NXP Semiconductors MCIMX257CJM4

Overview

MCIMX257CJM4 from NXP Semiconductors (formerly Freescale) is an ARM926EJ-S-based multimedia applications processor operating at up to 400 MHz, featuring 128 KB on-chip SRAM, integrated 10/100 Ethernet MAC, dual USB PHYs (HS OTG + FS Host), and LCD controller with alpha blending. It targets industrial HMI, residential gateways, and patient-monitoring devices requiring robust real-time performance and extended temperature operation.

For engineers reviewing the MCIMX257CJM4 datasheet, MCIMX257CJM4 pinout, MCIMX257CJM4 application, or MCIMX257CJM4 equivalent, this page delivers verified electrical specs, validated package mapping, confirmed peripheral integration (FlexCAN, ESAI, CSI, SIM), and precise thermal and supply requirements for production-grade embedded design.

Technical Context

The MCIMX257CJM4 implements a single ARM926EJ-S core with 16 KB L1 instruction and 16 KB L1 data cache, supporting only Little Endian mode. Its memory subsystem includes DDR2/DDR/MobileDDR, NAND, NOR, PSRAM, and SDRAM interfaces via the External Memory Interface (EMI) with dedicated controllers for each type.

Peripherals are managed through two AIPS (ARM Integration Platform Subsystems), SPBA arbitration, and Smart DMA (SDMA) engine with 32 channels. Security functions include DryIce tamper detection, IIM fuse-based key storage, secure boot, and hardware-accelerated encryption support - all enabled in the MCIMX257 variant per Table 2 of IMX25CEC Rev. 10.

Key Specifications

Pinout & Package

MCIMX257CJM4 uses a 400-ball MAPBGA package (Case 5284), 17 mm × 17 mm, 0.8 mm pitch, with ball map defined in Table 103 of IMX25CEC Rev. 10. Power, ground, and signal assignments follow Freescale's standardized i.MX25 layout for thermal and EMI integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCIMX257CJM4, MCIMX253CJM4 reduces peripheral count to lower cost and power, while MCIMX257CJN4A maintains full functionality in a smaller package - enabling either cost-optimized or space-constrained deployment without sacrificing core i.MX257 capabilities.

Availability

MCIMX257CJM4 is available at Aetrix Electronics and suitable for industrial HMI, residential gateway, and patient-monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability for regulated markets.

Supply support for MCIMX257CJM4 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 applications, with roots in Freescale's embedded processing heritage.

The i.MX25 product line was designed specifically for cost-sensitive, high-reliability industrial and medical embedded systems - emphasizing low-power operation, hardware security, and broad peripheral integration without external glue logic.

FAQ

What is the maximum operating frequency of the MCIMX257CJM4?

The MCIMX257CJM4 operates at a maximum CPU frequency of 400 MHz using the ARM926EJ-S core. This speed requires QVDD core voltage between 1.38 V and 1.52 V, as specified in Table 6 of the IMX25CEC datasheet. Performance is sustained across the full –40 °C to +85 °C industrial temperature range without throttling.

Does the MCIMX257CJM4 support DDR2 memory, and what is the maximum clock rate?

Yes, the MCIMX257CJM4 supports DDR2 memory up to 133 MHz, as stated in the Introduction section of IMX25CEC Rev. 10. The External Memory Interface (EMI) includes a dedicated DDR2 controller capable of handling 16-bit or 32-bit wide interfaces with configurable timing parameters for reliable operation in industrial environments.

What security features are implemented in the MCIMX257CJM4 that distinguish it from the MCIMX253 series?

The MCIMX257CJM4 includes DryIce tamper detection, IIM fuse-based key storage, and secure boot - features absent in the MCIMX253 series. These are confirmed in Table 2 of IMX25CEC Rev. 10 and enable hardware-rooted trust for HIPAA-compliant medical devices and secure firmware updates without software-only mitigation.

Is the MCIMX257CJM4 pin-compatible with other i.MX25 variants in the same package?

Yes, the MCIMX257CJM4 shares the same 400-ball MAPBGA (17×17 mm, 0.8 mm pitch) package and ball map (Table 103) with MCIMX253CJM4 and MCIMX258CJM4. Pin assignments for power, ground, clocks, and core interfaces are identical; peripheral-specific pins (e.g., FlexCAN, ESAI) are reserved but unused in variants lacking those blocks.

What is the role of the BAT_VDD pin on the MCIMX257CJM4, and what supply is required?

The BAT_VDD pin supplies backup power to the DryIce security module and RTC in the MCIMX257CJM4. It must be connected to a coin cell (1.15–1.55 V) to retain secure keys and timekeeping during main power loss. Per Table 6, typical operation requires 1.3 V nominal, and an external capacitor ≥4 µF is mandatory on NVCC_DRYICE for power-loss protection.