ST ST23YT66 User Manual

with USB and SPI interfaces and 66 KBytes EEPROM

TSSOP20

(6.4 x 6.2 mm)

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

ST23YT66

Smartcard MCU

Data brief

■ 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

Applications

December 2010 Doc ID 15120 Rev 2 1/5

ST23YT66 major applications include:

■ Pay TV applications

■ Secure Internet/computer applications

www.st.com

1

ST23YT66 Description

1 Description

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: www.st.com.

Doc ID 15120 Rev 2 2/5