DS2252T Datasheet, PDF (1/15 Pages) Dallas Semiconductor – Secure Microcontroller Module

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DS2252T
Secure Microcontroller Module
FEATURES
PACKAGE OUTLINE
8051-compatible microcontroller for
secure/sensitive applications
- 32, 64, or 128 kbytes of nonvolatile
SRAM for program and/or data storage
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40
- In-system programming via on-chip
serial port
- Capable of modifying its own program or
40-Pin SIMM
data memory in the end system
Firmware security features:
- Memory stored in encrypted form
- Encryption using on-chip 64-bit key
- Automatic true random key generator
- SDI (Self-Destruct Input)
- Improved security over previous
generations
- Protects memory contents from piracy
Crashproof operation
- Maintains all nonvolatile resources for
over 10 years in the absence of power
- Power-fail Reset
- Early Warning Power-fail Interrupt
- Watchdog Timer
- Precision reference for power monitor
Fully 8051-compatible
- 128 bytes scratchpad RAM
- Two timer/counters
- On-chip serial port
- 32 parallel I/O port pins
Permanently powered real time clock
DESCRIPTION
The DS2252T Secure Microcontroller Module is an 8051-compatible microcontroller based on
nonvolatile RAM technology. It is designed for systems that need to protect memory contents from
disclosure. This includes key data, sensitive algorithms, and proprietary information of all types. Like
other members of the Secure Microcontroller family, it provides full compatibility with the 8051
instruction set, timers, serial port, and parallel I/O ports. By using NV RAM instead of ROM, the user can
program, then reprogram the microcontroller while in-system. This allows frequent changing of sensitive
processes with minimal effort. The DS2252T provides an array of mechanisms to prevent an attacker
from examining the memory. It is designed to resist all levels of threat including observation, analysis,
and physical attack. As a result, a massive effort would be required to obtain any information about
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