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High-Speed Secure Microcontroller

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Part Details
  • Feature-Rich, 8051-Compatible Microprocessor
    • Accesses Up to 4MB Program and 4MB Data Memory (All Nonvolatile)
    • In-System Programmable Through Serial Port
    • In-Application Programmable Through User Software Allows Self-Modification of Program/Data Memory
    • Four 8-Bit Ports/One 6-Bit Port
    • Three 16-Bit Timer/Counters
    • 256 Bytes of Scratchpad RAM
  • Advanced Features
    • CRC-16/32 Generator
    • 5KB Internal SRAM (Optional 1KB Stack)
    • Single or 3DES Engine
    • Partitionable Memory Segments Variable from 4KB to 256KB
  • High-Speed Architecture
    • Four Clocks-per-Machine Cycle
    • DC-to-25MHz Operation
    • Single-Cycle Instruction in 160ns
    • Dual Data Pointers Can Increment or Decrement Independently
    • Automatic Data Pointer (DPTR) Selection Available
    • Programmable Speed MOVX Instructions
    • 1KB On-Chip Instruction Cache
  • High-Reliability Operation
    • Power-Fail/Overvoltage Reset
    • Early-Warning Power-Fail Interrupt
    • Watchdog Timer
  • Nonvolatile Functions
    • On-Chip Real-Time Clock with Alarm Interrupt
    • 2KB Battery-Backed Internal SRAM
  • Interrupts
    • 15 Interrupts with Seven External Sources
  • Security Features
    • Executes Single/3DES-Encrypted Programs to Prevent Observation
    • Two Self-Destruct Inputs
    • 4096-Bit Modulo-Arithmetic Accelerator (MAA) for Public/Private Key Operations
    • Tamper Sensors Detect Thermal/Voltage/Probe Attacks
    • Programmable Attack Countermeasures
    • Secure-Loader Mode
    • True Random-Number Generator (RNG)
    • Unique ID Number in Every Device
    • Separate Program/Data Cryptograph
    • Program Memory Integrity Checking
  • Evaluation Kit Available (DS5250-KIT)
Additional Details
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The DS5250 is a highly secure, four clocks-per-machine cycle, 100% 8051-instruction-set-compatible microprocessor in Maxim's secure microcontroller family. It was designed to be the cryptographic engine of PIN pads, financial terminals, and any other application in which data security is paramount. A key feature of the device is that it encrypts its program memory and optionally its data memory with a hardware-based single-or triple-DES (data encryption standard) algorithm, making it almost impossible to extract information. It also implements block cipher encoding that uses block addresses to modify the encrypted data, further strengthening security. This makes the device ideal for storage and transmission of passwords, personal identification numbers, encryption keys, and other highly confidential information.

Note: Designers must have the following documents to fully use all the features of this device. This data sheet contains pin descriptions, feature overviews, and electrical specifications. Errata sheets contain deviations from published specifications. The user's guides offer detailed information about device features and operation.


  • Applications that Require Data Security
  • Financial Terminals
  • PIN Pads
Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA). To request an NDA, click here.

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1


Evaluation Kit for the DS5250



Evaluation Kit for the DS5250

Evaluation Kit for the DS5250

Features and Benefits

  • Easily Load Code Using Bootstrap Loader and Serial 0 Port (DB-9, J2)
  • Two DB-9 RS-232 Serial Connectors
  • Four Available Serial Ports
    • Two Internal Serial Ports
    • Two Using External UART Device
  • On-Board Power Supply Regulator
  • Header for Smart Card Socket
  • Security Access Module (SAM) Socket
  • Support for LCD Module
  • Pushbutton Switches for Keypad Simulation, Data Entry, and Board Control
  • Board Schematics Included to Provide a Convenient Reference Design

Product Detail

The DS5250 evaluation kit (EV) is a proven platform to conveniently evaluate the capabilities of the DS5250 high-speed secure microcontroller. It contains the microprocessor, 1MB of battery-backed SRAM, 1MB flash memory, a power-supply regulator, two DB-9 serial connectors, and switches and LEDs to control and display board operation. With the addition of a power supply and an RS-232 cable connected to a personal computer, the kit provides a completely functional system ideal for evaluating the capabilities of the DS5250.


  • Applications Requiring a Trusted Computing Environment for Private or Secret Information Such As Card Terminals, PIN Pads, Access Control Units, and Similar Applications

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