DS2250(T) Soft Microcontroller Module www.maxim-ic.com DESCRIPTION FEATURES The DS2250(T) soft microcontroller module is a 8-Bit 8051-Compatible Microcontroller fully 8051-compatible 8-bit CMOS microcontroller that Adapts to Task-At-Hand offers softness in all aspects of its application. 8, 32, or 64kbytes of Nonvolatile RAM for This is accomplished through the comprehensive Program and/or Data Memory Storage use of nonvolatile technology to preserve all Initial Downloading of Software in End System information in the absence of system V . The via On-Chip Serial Port CC internal program/data memory space is Capable of Modifying its Own Program and/or implemented using 8, 32, or 64kbytes of nonvolatile Data Memory in End Use CMOS SRAM. Furthermore, internal data registers High-Reliability Operation and key configuration registers are also nonvolatile. Maintains All Nonvolatile Resources Up to 10 An optional real-time clock gives permanently Years in the Absence of V at Room CC powered timekeeping. The clock keeps time to a Temperature hundredth of a second using an on-board crystal. Power-Fail Reset All nonvolatile memory and resources are Early Warning Power-Fail Interrupt maintained for over 10 years at room temperature in Watchdog Timer the absence of power. Software Security Feature Executes Encrypted Software to Prevent Unauthorized Disclosure PIN CONFIGURATION On-Chip, Full-Duplex Serial I/O Ports Two On-Chip Timer/Event Counters 32 Parallel I/O Lines DS2250(T) Compatible with Industry Standard 8051 Instruction Set 1 20 21 40 Permanently Powered Real-Time Clock Operating information is contained in the Secure Microcontroller 40-Pin SIMM Users Guide. This data sheet provides ordering information, pinout, and electrical specifications. ORDERING INFORMATION PART RAM SIZE (kB) MAX CRYSTAL SPEED (MHz) TIMEKEEPING DS2250-32-16 32 16 No DS2250-32-16+ 32 16 No DS2250-64-16 64 16 No DS2250-64-16 64 16 No DS2250T-32-16 32 16 Yes DS2250T-32-16+ 32 16 Yes DS2250T-64-16 64 16 Yes DS2250T-64-16+ 64 16 Yes + Denotes lead-free/RoHS-compliant package Denotes RoHS-compliant device that may contain lead exempt under the RoHS requirements. 1 of 18 REV: 060906 DS2250(T) DS2250(T) BLOCK DIAGRAM Figure 1 2 of 18