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Status
Part Number	Status
DS2252T	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet

FULL DATA SHEET (PDF, 680kB) Download   E-Mail

Description

The DS2252T Secure Microcontroller Module incorporates the DS5002FP chip with a clock source and lithium back-up in a preassembled and tested SIMM form factor. The chip design employs a 100% 8051-compatible architecture based on NV RAM technology. It combines adaptive programming capability with advanced security features that strongly protect memory contents. The DS2252T enables in-system programming and automatic loading of new encryption keys through the serial port. Users can designate and change memory partitions for program and data. The microcontroller decodes memory access to the SRAM, accesses memory via its bytewide bus and write-protects the program memory portion. The result: frequent, secure reprogramming with minimal effort. Security features include a strong software encryption algorithm based on an 80-bit key word loaded from an on-chip true random number generator. (Customer-specific algorithms are available.) A Self-Destruct Input pin (SDI) is provided to interface to external tamper detection circuitry. An optional top-coating for the die is available to thwart microprobe techniques. The DS2252T module includes a 32kHz crystal driving a permanently powered real-time lock with interrupts for time stamp and date. Crash-proof operation is ensured with power monitoring circuitry that includes power-fail reset, interrupt, and a watchdog timer. All nonvolatile memory and resources are maintained for over 10 years at room temperature in the absence of power. The DS2252T is an ideal microcontroller for systems incorporating sensitive data and that require ultra-secure, time-stamped transactions. These include automatic access control to private or proprietary systems, digital monetary transactions, and software protection.

This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.

Key Features

8051-compatible microcontroller for secure/sensitive applications: 32, 64, or 128kbytes of nonvolatile SRAM for program and/or data storage In-system programming via on-chip serial port Capable of modifying its own program or data memory in the end system Firmware security features: Memory stored in encrypted form Encryption using on-chip 64-bit key Automatic true random number key generator SDI (Self-Destruct Input) 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, accurate to 100th seconds Operating ranges: 5V ±10% 16MHz clock speed (max) 0°C to +70°C Underwriters Laboratories (UL®) Recognized

Diagram

Block Diagram

Application Notes

Application Note 92: DS5002FP Memory Expansion Techniques - DS2252T Application Note 93: Design Guidelines for Microcontrollers Incorporating NV RAM - DS2252T Application Note 101: Using the Secure Microcontroller Watchdog Timer - DS2252T Application Note 137: Using a EconOscillator™ to Clock an 8051 Microprocessor - DS2252T Application Note 165: Interfacing the DS2760 1-Wire High-Precision Li-Ion Battery Monitor and Protection IC in a Microcontroller Environment - DS2252T Application Note 595: 8051 Microcontrollers: Frequently Asked Questions - DS2252T Application Note 1087: Micro Tutorial 1: Understanding DC Electrical Characteristics of Microcontrollers - DS2252T Application Note 2035: The Fast 8051 Microcontroller: Leading the Way in Growth and Innovation - DS2252T Application Note 3262: In-System Programming with 8051-Based Microcontrollers - DS2252T Application Note 3421: Interfacing 8051-based Microcontrollers to an SCI Port - DS2252T

Reliability Reports

Request Reliability Report for: DS2252T Underwriters Laboratories (UL®) Recognized

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-5 of 5

DS2252T	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS2252T-128-12			N/A	No Longer Available	DS2252T-128-16	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS2252T-32-12			N/A	No Longer Available	DS2252T-32-16	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS2252T-64-12			N/A	No Longer Available	DS2252T-64-16	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS2252T-128-16	16MHz w/RTC			Active		0 pin;0 mm² Land Pattern: Not Available Use pkgcode/variation: SS-8*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS2252T-64-16	16MHz w/RTC			Active		0 pin;0 mm² Land Pattern: Not Available Use pkgcode/variation: SS-10*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis

More Information

Microcontroller Tool Kit Development Software Secure Microcontroller User's Guide (PDF, 1.6MB, 07/14/03)

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