The DS87C520/DS83C520 EPROM/ROM high-speed microcontrollers are fast 8051-compatible microcontrollers. They feature a redesigned processor core without wasted clock and memory cycles. As a result, the devices execute every 8051 instruction between 1.5 and 3 times faster than the original for the same crystal speed. Typical applications will see a speed improvement of 2.5 times using the same code and the same crystal. The DS87C520/DS83C520 offer a maximum crystal speed of 33MHz, resulting in apparent execution speeds of 82.5MHz (approximately 2.5X).

The DS87C520/DS83C520 are pin compatible with all three packages of the standard 8051, and include standard resources such as three timer/counters, serial port, and four 8-bit I/O ports. They feature 16kB of EPROM or mask ROM with an extra 1kB of data RAM. Both OTP and windowed packages are available.

Besides greater speed, the microcontroller includes a second full hardware serial port, seven additional interrupts, programmable Watchdog Timer, Brownout Monitor, and Power-Fail Reset. The device also provides dual data pointers (DPTRs) to speed block data memory moves. It also can adjust the speed of MOVX data memory access from two to nine machine cycles for flexibility in selecting external memory and peripherals.

A new Power Management Mode (PMM) is useful for portable applications. This feature allows software to select a lower speed clock as the main time base. While normal operation has a machine cycle rate of 4 clocks per cycle, the PMM runs the processor at 64 or 1024 clocks per cycle. For example, at 12MHz, standard operation has a machine cycle rate of 3MHz. In Power Management Mode, software can select either 187.5kHz or 11.7kHz machine cycle rate. There is a corresponding reduction in power consumption when the processor runs slower.

The EMI reduction feature allows software to select a reduced emission mode. This disables the ALE signal when it is unneeded.

The DS83C520 is a factory mask ROM version of the DS87C520 designed for high-volume, cost-sensitive applications. It is identical in all respects to the DS87C520, except that the 16kB of EPROM is replaced by a user-supplied application program. All references to features of the DS87C520 will apply to the DS83C520, with the exception of EPROM-specific features where noted. Please contact your local Dallas Semiconductor sales representative for ordering information.
DS83C520、DS87C520:原理框图 DS83C520、DS87C520:原理框图 放大+


  • 80C52 Compatible
    • 8051 Pin- and Instruction-Set Compatible
    • Four 8-Bit I/O Ports
    • Three 16-Bit Timer/Counters
    • 256 Bytes Scratchpad RAM
  • Large On-Chip Memory
    • 16kB Program Memory
    • 1kB Extra On-Chip SRAM for MOVX
  • ROMSIZE Feature
    • Selects Internal ROM Size from 0 to 16kB
    • Allows Access to Entire External Memory Map
    • Dynamically Adjustable by Software
    • Useful as Boot Block for External Flash
  • High-Speed Architecture
    • 4 Clocks/Machine Cycle (8051 = 12)
    • Runs DC to 33MHz Clock Rates
    • Single-Cycle Instruction in 121ns
    • Dual Data Pointer
    • Optional Variable Length MOVX to Access Fast/Slow RAM/Peripherals
  • Power Management Mode
    • Programmable Clock Source to Save Power
    • CPU Runs from (crystal/64) or (crystal/1024)
    • Provides Automatic Hardware and Software Exit
  • EMI Reduction Mode Disables ALE
  • Two Full-Duplex Hardware Serial Ports
  • High Integration Controller Includes:
    • Power-Fail Reset
    • Early-Warning Power-Fail Interrupt
    • Programmable Watchdog Timer
  • 13 Interrupt Sources with Six External
  • Available in 40-pin PDIP, 44-Pin PLCC, 44-Pin TQFP, and 40-Pin Windowed CERDIP
  • Factory Mask DS83C520 or EPROM (OTP) DS87C520
Part NumberMCU CoreCore Clock Speed
Data ProcessingInternal SRAM
USARTsTimer FeaturesPackage/PinsBudgetary
maxSee Notes
DS83C520 8051 (CISC)338-bit12Watchdog
$23.88 @1k
查看所有Microcontrollers (57)
Pricing Notes:


用户指南 4827 High-Speed Microcontroller User's Guide
应用笔记 4199 从高速微控制器系列向超高速闪存微控制器的升级
应用笔记 3452 Instant Performance Enhancement with Flash Microcontrollers
应用笔记 3421 Interfacing 8051-based Microcontrollers to an SCI Port
应用笔记 2035 高速8051微控制器:引领成长与创新之路
应用笔记 1771 Microcontrollers Improve Power Efficiency of 8051-Based Designs
应用笔记 1087 Micro Tutorial 1: Understanding DC Electrical Characteristics of Microcontrollers
应用笔记 603 Implementing a Serial Port FIFO Using Dual Data Pointers
应用笔记 595 8051 Microcontrollers: Frequently Asked Questions
应用笔记 548 Using the High-Speed Micro's Watchdog Timer
应用笔记 408 Controlling a DS1803 Digital Potentiometer Using an 8051 Microprocessor to Generate 2-Wire Signals
应用笔记 170 Adding Nonvolatile SRAM into Embedded Systems
应用笔记 137 Using a EconOscillator™ to Clock an 8051 Microprocessor
应用笔记 102 Using the High-Speed Microcontroller as a Bootstrap Loader
应用笔记 89 High-Speed Micro Memory Interface Timing
应用笔记 81 Memory Expansion with the High-Speed Microcontroller Family
应用笔记 78 Using Power Management with High-Speed Microcontrollers
应用笔记 75 Using the High-Speed Micro's Serial Ports
应用笔记 57 DS80C320 Memory Interface Timing


产品可靠性报告: DS87C520.pdf 


高速微控制器用户指南 (PDF, English only)
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

质量管理体系 >
环境管理体系 >



ChipDNA Secure Arm Cortex M4 Microcontroller

    High-Efficiency Microcontroller for Secure Element IoT
  • Secure Element
  • Power Management Maximizes Operating Time for Battery Applications
  • Multiple Peripherals for System Control

Low-Power Arm Cortex-M4 Microcontroller with Contactless Radio for Secure Applications

  • High-Efficiency Microcontroller for Secure Battery-Powered Applications
  • Scalable Cached External Memory Interfaces
  • Security Features Facilitates System-Level Protection