Description

ST23YS08

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DB_23YS08/0704

1

Description

The ST23YS08 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 device includes an Enhanced DES accelerator (EDES). It enables Cipher Block

Chaining (CBC) mode, DES and triple DES computation.

A serial interface fully compatible with the ISO 7816-3 standard (T = 0 and T = 1) for

Smartcard applications is available.

A CRC calculation block is also available.

Figure 1.

ST23YS08 block diagram

Ai12551

Internal Bus

I/O

IART

GND

8/16-bit

CPU

Core

2 x

8-bit

timers

CRC

Module

CLK

Clock

Gene-

rator

Module

Vcc

True

Random

Number

Gene-

rator

RAM

ST ROM

(Boot software)

Security

Monitor-

ing and

Control

RESET

EEPROM

EDES

Accelerator

User ROM

ST ROM Firewall