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DS80C320, DS80C323

High-Speed/Low-Power Microcontrollers

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Status Explanations for product status codes

Part Number Status
DS80C320 Active: In Production. See Ordering Information for details.
DS80C323 Active: In Production. See Ordering Information for details.


The DS80C320/DS80C323 are fast 80C31/80C32-compatible microcontrollers. Wasted clock and memory cycles have been removed using a redesigned processor core. As a result, every 8051 instruction is executed between 1.5 and 3 times faster than the original for the same crystal speed. Typical applications see a speed improvement of 2.5 times using the same code and same crystal. The DS80C320 offers a maximum crystal rate of 33MHz, resulting in apparent execution speeds of 82.5MHz (approximately 2.5X).

The DS80C320/DS80C323 are pin compatible with all three packages of the standard 80C32 and offer the same timer/counters, serial port, and I/O ports. In short, the devices are extremely familiar to 8051users, but provide the speed of a 16-bit processor.

The DS80C320 provides several extras in addition to greater speed. These include a second full hardware serial port, seven additional interrupts, programmable watchdog timer, power-fail interrupt and reset. The device also provides dual data pointers (DPTRs) to speed block data memory moves. It can also adjust the speed of off-chip data memory access to between two and nine machine cycles for flexibility in selecting memory and peripherals.

The DS80C320 operating voltage ranges from 4.25V to 5.5V, making it ideal as a high-performance upgrade to existing 5V systems. For applications in which power consumption is critical, the DS80C323 offers the same feature set as the DS80C320, but with 2.7V to 5.5V operation.

Designers must have two documents to fully use all the features of this device: this data sheet and the High-Speed Microcontroller User's Guide, available on our website at Data sheets contain pin descriptions, feature overviews, and electrical specifications, whereas our user's guides contain detailed information about device features and operation.

Data Sheet

Download this datasheet in PDF formatDownload Rev 4 (PDF, 700kB)
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Errata DS80C320 80C320A6.pdf
Errata DS80C320 80C320B3.pdf
Errata DS80C320 80C320B5.pdf
Errata DS80C320 80C320C4.pdf
Errata DS80C320 80C320C5.pdf
Errata DS80C323 80C323B5.pdf
Errata DS80C323 80C323C4.pdf
Errata DS80C323 80C323C5.pdf
Errata DS80C323 80C323B3.pdf
Errata DS80C320 80C320C6.pdf
Errata DS80C320 80C320C7.pdf
Errata DS80C323 80C323C6.pdf
Errata DS80C323 80C323C7.pdf

Key Features

  • 80C32-Compatible
    • 8051 Pin and Instruction Set Compatible
    • Four 8-Bit I/O Ports
    • Three 16-Bit Timer/Counters
    • 256 Bytes Scratchpad RAM
    • Addresses 64kB ROM and 64kB RAM
  • High-Speed Architecture:
    • 4 Clocks/Machine Cycle (8032 = 12)
    • DC to 33MHz (DS80C320)
    • DC to 18MHz (DS80C323)
    • Single-Cycle Instruction in 121ns
    • Uses Less Power for Equivalent Work
    • Dual Data Pointer
    • Optional Variable Length MOVX to Access Fast/Slow RAM/Peripherals
  • High-Integration Controller Includes:
    • Power-Fail Reset
    • Programmable Watchdog Timer
    • Early Warning Power-Fail Interrupt
  • Two Full-Duplex Hardware Serial Ports
  • 13 Total Interrupt Sources with Six External
  • Available in 40-Pin DIP, 44-Pin PLCC, and 44-Pin TQFP

Key Specifications:

Part Number MCU Core Core Clock Speed
Data Processing USARTs Timer Features Budgetary
max See Notes
DS80C320  8051 (CISC) 33 8-bit 2 Watchdog $7.46 @1k
DS80C323  18 $3.61 @1k
See All Microcontrollers (44)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


DS80C320, DS80C323: Block Diagram
Block Diagram

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High-Speed Microcontroller User's Guide (PDF)

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Rev 4; 2006-10-11
This page last modified: 2009-05-06