DS87C520:EPROM/ROM High-Speed Microcontrollers

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.

Key Features
  • 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
DS83C520, DS87C520: Block Diagram
DS83C520, DS87C520: Block Diagram
DataSheet
titleDownload file
DS83C520-DS87C520 Data SheetDS83C520-DS87C520.pdf
Errata DS87C52087C520A10.pdf
Errata DS87C52087C520A11.pdf
Errata DS87C52087C520A12.pdf
Errata DS87C52087C520A13.pdf
Errata DS87C52087C520A14.pdf
Errata DS87C52087C520A15.pdf
Errata DS87C52087C520A16.pdf
Errata DS87C52087C520A4.pdf
Errata DS87C52087C520A7.pdf
Errata DS87C52087C520A8.pdf
Parametrics
Part NumberMCU CoreCore Clock Speed
(MHz)
Data ProcessingInternal SRAM
(KBytes)
USARTsTimer FeaturesPackage/PinsBudgetary
Price
maxSee Notes
DS83C5208051 (CISC)338-bit12WatchdogSee Data Sheet-
DS87C520PDIP(W)/40
PLCC/44
TQFP/44
$22.74 @1k
Quality and Environmental Data
Additional Resources
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS87C520-ECLNo Longer AvailableDS87C520-ECL+TQFP,;44 pin;148.8 mm²0°C to +70°CNo
DS87C520-ECL+ActiveTQFP,;44 pin;148.8 mm²0°C to +70°CLead Free
DS87C520-ENLNo Longer AvailableDS87C520-ENL+TQFP,;44 pin;148.8 mm²-40°C to +85°CNo
DS87C520-ENL+ActiveTQFP,;44 pin;148.8 mm²-40°C to +85°CLead Free
DS87C520-MCLNo Longer AvailableDS87C520-MCL+PDIP(W),;40 pin;835.7 mm²0°C to +70°CNo
DS87C520-MCL+ActivePDIP(W),;40 pin;835.7 mm²0°C to +70°CLead Free
DS87C520-MNLNo Longer AvailableDS87C520-MNL+PDIP(W),;40 pin;835.7 mm²-40°C to +85°CNo
DS87C520-MNL+ActivePDIP(W),;40 pin;835.7 mm²-40°C to +85°CLead Free
DS87C520-QCLNo Longer AvailableDS87C520-QCL+PLCC,;44 pin;311.5 mm²0°C to +70°CNo
DS87C520-QCL+ActivePLCC,;44 pin;311.5 mm²0°C to +70°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS87C520-QNLNo Longer AvailableDS87C520-QNL+PLCC,;44 pin;311.5 mm²-40°C to +85°CNo
DS87C520-QNL+ActivePLCC,;44 pin;311.5 mm²-40°C to +85°CLead Free
DS87C520-WCLNo Longer AvailableCDIP;40 pin0°C to +70°CSee data sheet
DS83C520-DS87C520.pdf DS87C520
87C520A10.pdf DS87C520
87C520A11.pdf DS87C520
87C520A12.pdf DS87C520
87C520A13.pdf DS87C520
87C520A14.pdf DS87C520
87C520A15.pdf DS87C520
87C520A16.pdf DS87C520
87C520A4.pdf DS87C520
87C520A7.pdf DS87C520
87C520A8.pdf DS87C520
High-Speed Microcontroller User's Guide DS87C530
Instant Performance Enhancement with Flash Microcontrollers DS89C450
Interfacing 8051-based Microcontrollers to an SCI Port DS89C450
Microcontrollers Improve Power Efficiency of 8051-Based Designs DS87C520
Micro Tutorial 1: Understanding DC Electrical Characteristics of Microcontrollers DS89C450
Implementing a Serial Port FIFO Using Dual Data Pointers DS89C450
8051 Microcontrollers: Frequently Asked Questions DS89C450
Using the High-Speed Micro's Watchdog Timer DS87C530
Controlling a DS1803 Digital Potentiometer Using an 8051 Microprocessor to Generate 2-Wire Signals DS87C520
Adding Nonvolatile SRAM into Embedded Systems DS87C520
Using a EconOscillator™ to Clock an 8051 Microprocessor DS89C450
Using the High-Speed Microcontroller as a Bootstrap Loader DS87C530
High-Speed Micro Memory Interface Timing DS87C530
Memory Expansion with the High-Speed Microcontroller Family DS87C530
Using Power Management with High-Speed Microcontrollers DS89C450
Using the High-Speed Micro's Serial Ports DS89C450
DS80C320 Memory Interface Timing DS87C530
DS87C520.pdf DS87C520
高速微控制器用户指南 DS87C530
83C520A4.pdf DS83C520