NXP Semiconductors MCIMX257DJM4AR2

Overview

MCIMX257DJM4AR2 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 handheld scanners requiring deterministic real-time response and low-power operation.

For engineers reviewing the MCIMX257DJM4AR2 datasheet, MCIMX257DJM4AR2 pinout, MCIMX257DJM4AR2 application, or MCIMX257DJM4AR2 equivalent, key selection criteria include its –20°C to +70°C industrial temperature grade, 17 × 17 mm 0.8 mm pitch MAPBGA-400 package, support for DDR2 up to 133 MHz, and integrated FlexCAN, ESAI, CSI, and SIM interfaces - all confirmed in the IMX25CEC Rev. 10 datasheet.

Technical Context

The MCIMX257DJM4AR2 implements a single ARM926EJ-S core with 16 KB L1 instruction and 16 KB L1 data cache, operates exclusively in Little Endian mode, and integrates a Clock Control Module (CCM) managing wait/stop/doze power states via selective peripheral clock gating. Its Smart DMA (SDMA) engine supports 32 channels for offloading memory-intensive tasks from the CPU.

It includes dedicated security hardware: DryIce tamper-detect module with MESH_C/MESH_D and TAMPER_A/TAMPER_B inputs, IIM fusebox for cryptographic key storage, and secure boot capability. The device supports external memory via EMI with DDR2, NAND, NOR, PSRAM, and SDRAM interfaces - no internal flash or ROM boot loader.

Key Specifications

Pinout & Package

MCIMX257DJM4AR2 is housed in a 17 × 17 mm, 0.8 mm pitch MAPBGA-400 plastic package (Case 5284). Ball map and signal assignments are defined in IMX25CEC Rev. 10 Sections 4.1–4.4, including dedicated power domains (QVDD, NVDD_GPIO1/2, NVDD_DDR2), security pins (TAMPER_A/B, MESH_C/D, BAT_VDD), and high-speed interface balls (USBPHY1/2, DDR2 DQ/DQS, CSI data lanes).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCIMX257CJM4A, MCIMX257DJM4AR2 trades extended temperature tolerance for lower unit cost and same feature set; compared with i.MX283, it offers proven stability and simpler power architecture but lacks hardware crypto acceleration and requires external PMIC.

Availability

MCIMX257DJM4AR2 is available at Aetrix Electronics and suitable for industrial HMI panels, residential gateways, and handheld scanners requiring stable component supply, long-term lifecycle support, and verified industrial temperature grading.

Supply support for MCIMX257DJM4AR2 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 processor heritage.

The i.MX25 product line was designed specifically for cost-sensitive, low-power industrial and consumer embedded systems requiring rich multimedia capability, deterministic real-time performance, and hardware security - exemplified by MCIMX257DJM4AR2's integrated LCD controller, FlexCAN, and DryIce modules.

FAQ

What is the maximum DDR2 memory speed supported by MCIMX257DJM4AR2?

MCIMX257DJM4AR2 supports DDR2 memory at up to 133 MHz, as specified in Section 3.6 of the IMX25CEC Rev. 10 datasheet. This corresponds to a 266 MT/s data rate with 16-bit bus width. The External Memory Interface (EMI) includes programmable timing registers to accommodate variations in DDR2 chip setup/hold times and CAS latency.

Does MCIMX257DJM4AR2 include an integrated USB PHY?

Yes, MCIMX257DJM4AR2 integrates two USB PHYs: a high-speed (480 Mbps) USB OTG PHY and a full-speed (12 Mbps) USB Host PHY. These are documented in Section 2 of IMX25CEC Rev. 10 and eliminate the need for external transceivers in basic USB connectivity implementations.

What security features are implemented in MCIMX257DJM4AR2?

MCIMX257DJM4AR2 includes DryIce tamper-detection hardware with MESH_C/D and TAMPER_A/B inputs, IIM fusebox for cryptographic key storage, and secure boot capability. These features are detailed in Tables 3 and 4 of IMX25CEC Rev. 10 and enable compliance with PCI PTS and EMV Level 1 requirements for secure payment terminals.

Is MCIMX257DJM4AR2 pin-compatible with other i.MX25 variants like MCIMX253 or MCIMX258?

No, MCIMX257DJM4AR2 is not pin-compatible with MCIMX253 or MCIMX258. While all share the same 17×17 mm MAPBGA-400 package, Table 2 in IMX25CEC Rev. 10 confirms functional differences: MCIMX257 includes FlexCAN, ESAI, CSI, and SIM interfaces absent in MCIMX253, and lacks the advanced security block present in MCIMX258 - resulting in distinct ball assignments.

What is the purpose of the NVCC_DRYICE pin on MCIMX257DJM4AR2?

NVCC_DRYICE is a regulated 1.0–1.55 V output from the DryIce security module, used to power external tamper-detection circuitry. As specified in Section 3.1.2 of IMX25CEC Rev. 10, it requires a minimum 4.7 µF external capacitor to maintain secure RTC operation and tamper-event integrity during power transitions.