Maxim Integrated Secure Microcontroller - Manual (Page 9)

Secure Microcontroller User’s Guide
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1.3 Product Description
All secure microcontroller products have the following standard 8051 family features:
 8051-compatible instruction set
 Four 8-bit pseudo-bidirectional I/O ports
 Two 16-bit timer/counters
 Five interrupts with two external
 Addresses 64kB program and 64kB data memory
 128 bytes scratchpad RAM
 One UART
DS5000FP Soft Microprocessor Chip
The DS5000FP is the original soft microprocessor chip. It adds the following features to the 8051 set:
 Nonmultiplexed bytewide address/data bus for memory access
 Nonvolatile control for 8kB x 8 or 32kB x 8 SRAMs
 Partitions one SRAM into program and data areas and write protects the program segment
 Decodes memory for up to two 32kB x 8 SRAMs (#2 is data memory only)
 Power-fail reset and interrupt
 Precision watchdog timer
 ROM-based serial bootstrap loader
 Optional security features
− Memory encryption in real-time
− 48-bit user selected encryption key
− Security lock destroys memory if unlocked
− Vector RAM hides 48 bytes on-chip
− Dummy operations on the memory bus
DS5000(T) Soft Microcontroller Module
The DS5000 incorporates the DS5000FP chip in a 40-pin module with an 8051 footprint and pinout.
 Familiar 40-pin DIP package
 Built-in NV RAM of 32kB x 8
 I/O ports not disturbed by on-board memory access
 10-year data retention and clock operation in the absence of power
 Partitions memory into program and data areas, write protects the program segment
 Power-fail reset and interrupt
 Precision watchdog timer
 ROM-based serial bootstrap loader
 Optional memory security
 Optional built-in RTC (battery backed)
DS2250(T) Soft Microcontroller Module
The DS2250(T) incorporates the DS5000FP chip on a 40-pin SIMM module. It has the identical feature
set as the DS5000(T), but is in a different form-factor. This package change allows up to 64kB NV RAM
instead of 32kB. Note that as mentioned above, the second 32kB is restricted to data memory. Like the
DS5000(T), this module guarantees better than 10-year data retention at room temperature.
DS5001FP 128kB Soft Microprocessor Chip