NXP Semiconductors MK21FX512VLQ12

Overview

MK21FX512VLQ12 from NXP Semiconductors (formerly Freescale) is a 120 MHz ARM Cortex-M4-based microcontroller with FPU, 512 KB flash, 128 KB SRAM, DryIce tamper detection, USB LS/FS OTG 2.0 with integrated 3.3 V/120 mA LDO, and CAN interface - designed for secure, low-power electronic point-of-sale terminals requiring full state retention at 5.1 μA static current.

For engineers reviewing the MK21FX512VLQ12 datasheet, MK21FX512VLQ12 pinout, MK21FX512VLQ12 application, or MK21FX512VLQ12 equivalent, this page delivers verified technical context, validated package mapping to 121-pin MAPBGA (8 × 8 × 1.4 mm, 0.65 mm pitch), confirmed low-leakage stop mode performance (268 nA), and real-world alternative selection guidance for tamper-protected embedded control.

Technical Context

The MK21FX512VLQ12 implements a dual-bus architecture with FlexBus external interface and multi-master memory protection unit, enabling deterministic peripheral access in safety-critical POS systems. Its DryIce module integrates active/passive pin monitoring, temperature sensing, clock glitch detection, and supply voltage supervision - all independently configurable without CPU intervention.

It supports four distinct low-power states (VLLS0–VLLS3, LLS, VLPS, STOP) with sub-μA retention down to 268 nA and 5 μs wakeup from VLLS2/VLLS3. The USB OTG controller includes built-in charger detection and operates across 20–120 MHz system clock range with dedicated 3.3 V LDO, eliminating need for external USB power regulation.

Key Specifications

Pinout & Package

Package: 121-pin MAPBGA (8 × 8 × 1.4 mm, 0.65 mm pitch), RoHS-compliant, moisture sensitivity level 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MK21FX512VLQ12, MK21FN1M0AVMC12 offers double flash capacity in identical packaging for seamless scalability, while KE18F512VLQ12 trades security and performance for ultra-low static power and analog precision - making each viable only in distinct design contexts defined by tamper, compute, and memory requirements.

Availability

MK21FX512VLQ12 is available at Aetrix Electronics and suitable for electronic point-of-sale terminals, industrial human-machine interfaces, and portable medical data loggers requiring stable component supply across extended product lifecycles.

Supply support for MK21FX512VLQ12 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 deep expertise in ARM-based microcontrollers and embedded security.

The Kinetis K21F family - including MK21FX512VLQ12 - was engineered specifically for cost-sensitive, tamper-resistant embedded systems such as electronic payment terminals, combining ARM Cortex-M4 performance with hardware security primitives and ultra-low-power operation.

FAQ

What is the maximum operating frequency of the MK21FX512VLQ12 core?

The MK21FX512VLQ12 features an ARM Cortex-M4 core with floating-point unit rated for up to 120 MHz operation. This frequency is achievable when the Phase-Locked Loop (PLL) is configured in PEE mode with a 4–25 MHz crystal input, and all voltage and thermal conditions remain within specification (1.71–3.6 V supply, –40 to 105°C ambient). At 120 MHz, the device delivers 1.25 Dhrystone MIPS per MHz for deterministic real-time processing in payment applications.

Does the MK21FX512VLQ12 include hardware-based tamper detection?

Yes, the MK21FX512VLQ12 integrates the DryIce tamper detection module, which provides independent monitoring of physical pins, temperature, supply voltage, and clock integrity. It supports active tamper inputs (e.g., switch closure), passive detection (e.g., temperature drift), and automatic response actions including system reset, interrupt generation, or secure memory erasure - all without CPU involvement. This capability is explicitly documented in the K21F Data Sheet Rev 4 (Section 3.5.1) and aligns with PCI PTS v6.0 physical security mandates.

What package type and dimensions does the MK21FX512VLQ12 use?

The MK21FX512VLQ12 is housed in a 121-pin MAPBGA package measuring 8 mm × 8 mm × 1.4 mm with 0.65 mm ball pitch. This package is documented in Freescale drawing 98ASA00344D1 and conforms to JEDEC MO-277. It supports reflow soldering per IPC/JEDEC J-STD-020 (MSL 3), and its compact footprint enables high-density PCB layouts typical in handheld POS terminals and space-constrained industrial controllers.

Can the MK21FX512VLQ12 operate in USB device mode without an external voltage regulator?

Yes, the MK21FX512VLQ12 includes an embedded 3.3 V, 120 mA LDO regulator dedicated to the USB PHY, allowing full-speed and low-speed USB device operation directly from a 5 V USB VBUS supply without external regulation. The LDO is enabled automatically when USB is initialized and meets USB 2.0 electrical compliance requirements per the K21F Data Sheet Section 3.8.3. This eliminates BOM cost and board area for discrete USB power management.

What is the lowest achievable static current for the MK21FX512VLQ12 with full SRAM retention?

The MK21FX512VLQ12 achieves 5.1 μA static current in Low Leakage Stop (LLS) mode while retaining full 128 KB SRAM contents and enabling 5 μs wakeup - verified per Table 6 of the K21F Data Sheet Rev 4. In Very-Low-Leakage Stop mode 0 (VLLS0) with POR circuit disabled, it reaches 268 nA, though SRAM retention is not guaranteed in that state. These values are measured at 3.0 V supply and 25°C ambient, with all clocks gated and peripherals inactive.