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ST23 Secure MCU with USB and SPI interfaces, enhanced security and 66 KBytes EEPROM

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Product overview


The ST23YT66 product is a serial access microcontroller specially designed for secure smartcard applications.

It is based on an enhanced STMicroelectronics 8/16-bit CPU core offering 16 Mbytes linear addressing space. It is manufactured using an advanced highly reliable ST CMOS EEPROM technology.

The ST23YT66 is a secure USB microcontroller based on the ST23 core architecture. Its high security level and versatile communication interfaces address user identification functions for computer or network access or for computer-based local or remote applications.

The ST23YT66 features a USB full-speed interface for communication with computers as well as various I/Os and an SPI bus for user interfaces (keyboards, displays, etc.).

The ST23YT66 USB hardware accelerator provides a very efficient AutoPlay mode implementation. This enables the content of a companion serial Flash memory to be uploaded to a computer at a speed close to USB bandwidth.

In order to meet environmental requirements, ST (also) offers these devices in ECOPACK® packages. ECOPACK®packages are lead-free. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label.

ECOPACK is an ST trademark. ECOPACK specifications are available at:

  • All features

    • Hardware features
      • Enhanced 8/16-bit ST23 CPU core with 16 Mbytes linear addressable memory
      • 210 Kbytes of User ROM
      • 6.2 Kbytes of User RAM
      • 2 Kbytes of NESCRYPT RAM
      • 66 Kbytes of User EEPROM including 128 bytes of User OTP area:
        • Highly reliable CMOS EEPROM submicron technology
        • 30-year data retention
        • 500,000 Erase/Write cycles endurance typical at 25° C
        • 1 to 64 bytes Erase or Program in 1.5 ms
      • Enhanced NESCRYPT crypto-processor for public key cryptography
      • Hardware security enhanced DES accelerator
      • Three 8-bit timers with watchdog and interrupt capability
      • 3V to 5.5V supply voltage range
      • 0 to 70 °C operating range
      • High performance provided by:
        • CPU clock frequency up to 29 MHz
      • Power-saving Standby state
      • 10-MHz Master Serial Peripheral Interface (SPI) bus
      • USB hardware accelerator for AutoPlay
      • 12 GPIO pins
        • 7 bidirectional input/output pins
        • 5 unidirectional input pins
      • Full-speed USB 2.0 interface
        • 8 Endpoints
        • 2 x 16 bytes (EP0)
        • 2 x 16 bytes for INT transfer (EP1)
        • 2x64 bytes for In/Out Bulk and INT transfer (EP2)
        • 2x64 bytes for In/Out Bulk and INT transfer (with hardware accelerator) (EP3)
        • Clock recovery
      • ESD protection greater than 5 kV (HBM) for all pads and 2 kV for XIN and XOUT pads
    • Security features
      • Active shield
      • Monitoring of environmental parameters
      • Protection mechanisms against faults
      • AIS-31 class P2 compliant true random number generator (TRNG)
      • ISO 3309 CRC calculation block
      • Memory protection unit (MPU)
      • Unique serial number on each die
    • Development environment
      • Software development and firmware generation are supported by a comprehensive set of development tools dedicated to software design and validation:
        • C compiler and emulator

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STMicroelectronics - ST23YT66

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