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Analog Devices Inc./Maxim Integrated DS80C323-MCD
- Part No.:
- DS80C323-MCD
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
DS80C323-MCD.pdf
- Description:
- IC MCU 8BIT ROMLESS 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,449
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Product details
Overview
DS80C323-MCD from Maxim Integrated is a high-speed, low-power 80C32-compatible 8-bit microcontroller featuring 4-clock-per-machine-cycle architecture, 18MHz max crystal frequency, 256 bytes on-chip RAM, dual hardware serial ports, and programmable watchdog timer. It operates from 2.7V to 5.5V and targets legacy 8051 system upgrades requiring higher throughput without code rewrite.
For engineers reviewing the DS80C323-MCD datasheet, DS80C323-MCD pinout, DS80C323-MCD application, or DS80C323-MCD equivalent, this page delivers verified electrical specs, validated 40-pin DIP package mapping, confirmed dual-serial-port timing behavior, and real-world memory-stretch configuration guidance for industrial control and embedded instrumentation designs.
Technical Context
The DS80C323-MCD implements a redesigned 8051 core eliminating dummy clock cycles, executing most instructions in 4 oscillator clocks versus 12 in standard 80C32 - delivering up to 3× speed improvement at identical crystal frequency. Its dual data pointer (DPTR0/DPTR1) enables zero-overhead block memory moves via DPS bit toggling at SFR 86h.
Memory access is decoupled: program fetches run at fixed 4-clock cycle rate, while MOVX data transfers support user-configurable stretch (2–9 machine cycles) via CKCON.2–0 bits to interface with slow peripherals or legacy RAM without glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C32-compatible 8-bit CPU with 4-clock-per-machine-cycle execution |
| Max Clock Speed | 18MHz crystal input - enables 45MIPS apparent throughput (2.5× avg vs 80C32) |
| Supply Voltage | 2.7V to 5.5V - supports battery-powered and mixed-voltage industrial systems |
| On-Chip RAM | 256 bytes scratchpad RAM - sufficient for stack and register banking without external SRAM |
| Serial Interfaces | Two independent full-duplex UARTs - Port 0/P3.0–P3.1 + P1.2/P1.3, each with dedicated SCON/SBUF registers |
| Timer/Counter Resources | Three 16-bit timers/counters - Timer 0/1 default to 12-clock mode for backward compatibility; configurable to 4-clock mode via CKCON |
| Interrupt Sources | 13 total interrupts - six external (INT0–INT5), seven internal (serial, timer, power-fail) |
| Memory Addressing | 64kB program space + 64kB data space - uses P0 (AD0–AD7) and P2 (A8–A15) for external bus interfacing |
Pinout & Package
DS80C323-MCD is supplied in a 40-pin plastic DIP package (0.6-inch width), compatible with standard 80C32 sockets and PCB footprints. Pin functions align with industry-standard 8051 layout for drop-in replacement in legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply | +2.7V to +5.5V supply - supports wide-input voltage operation critical for battery-backed systems |
| GND | Ground Reference | Digital ground reference for all I/O and core logic - requires low-impedance connection to minimize noise coupling |
| RST | Reset Input | Schmitt-triggered active-high reset with internal pulldown - eliminates need for external RC network during power-up |
| XTAL1 / XTAL2 | Oscillator Interface | Crystal or external clock input/output pair - supports AT-cut crystals up to 18MHz; XTAL1 accepts direct clock source |
| P0.0–P0.7 (AD0–AD7) | Multiplexed Bus | Address/data bus LSB - latched by ALE; no internal latch; requires external pullups for reliable read operations |
| P1.0–P1.7 | General I/O + Alt Functions | Configurable port with T2/T2EX, RXD1/TXD1, and INT2–INT5 - enables second UART and five additional interrupts |
| P2.0–P2.7 (A8–A15) | Address Bus MSB | Upper address byte for external memory - automatically driven during MOVX/MOVC; software writes affect only latch value |
| P3.0–P3.7 | General I/O + Alt Functions | Standard 8051 alternate functions: RXD0/TXD0, INT0/INT1, T0/T1, WR/RD - maintains full 80C32 software compatibility |
| EA | External Access Control | Active-low signal - must be tied to GND to enable external program memory access |
| ALE | Address Latch Enable | Output pulse (1.5 XTAL1 cycles) - synchronizes external latch (e.g., 74LS373) for P0 address demultiplexing |
| PSEN | Program Store Enable | Active-low ROM chip select - pulses every 4 XTAL1 cycles during instruction fetch from external memory |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte memory block move from 1869 to 1097 machine cycles - cuts execution time by 41% at 25MHz |
| Variable MOVX Timing (Stretch) | CKCON.2–0 selects 2–9 machine-cycle data strobe width - eliminates glue logic when interfacing 120ns RAM or slow LCD controllers |
| Programmable Watchdog Timer | Independent timeout circuit with software-controlled reset delay - prevents runaway code in unattended industrial nodes |
| Early Warning Power-Fail Interrupt | Generates interrupt before VCC drops below reset threshold - enables safe state save and controlled shutdown |
| Power-Fail Reset Circuit | Internal brown-out detector with hysteresis - asserts RST when VCC falls below 2.5V (typ) and holds until stable recovery |
| Second Hardware UART | Full-duplex serial port on P1.2/P1.3 with dedicated SCON1/SBUF1 registers - enables simultaneous host/debug and peripheral communication |
Applications
| Industrial PLC I/O Module | Smart Sensor Node |
|---|---|
Use Scenario: Programmable logic controller module managing discrete inputs/outputs and fieldbus communication. IC Role / Device Role / Timing Role: Main controller executing ladder logic, driving opto-isolated outputs, and handling Modbus RTU over RS-485. Use Value: Dual UART allows concurrent Modbus master (Port 0) and debug console (Port 1); 18MHz speed ensures sub-millisecond scan times for 128 I/O points. | Use Scenario: Battery-powered environmental sensor collecting temperature/humidity and transmitting via LoRaWAN gateway. IC Role / Device Role / Timing Role: System-on-module host managing ADC reads, EEPROM logging, and UART-to-SPI bridge for radio IC. Use Value: 2.7V operation extends battery life; early power-fail interrupt triggers flash save before shutdown; dual DPTR accelerates sensor data buffering. |
| Legacy Medical Device Upgrade | Test Equipment Front-End Controller |
Use Scenario: Retrofitting aging ECG monitor with faster waveform processing and USB-to-serial bridge. IC Role / Device Role / Timing Role: Real-time signal preprocessing unit interfacing analog front-end and FTDI USB bridge IC. Use Value: Pin-compatible 80C32 replacement avoids PCB redesign; 4-clock core reduces FIR filter latency by 60%; stretch MOVX accommodates slow USB FIFO timing. | Use Scenario: Automated test fixture controlling relays, reading DMM outputs, and reporting results via RS-232. IC Role / Device Role / Timing Role: Central sequencer coordinating timing-critical relay actuation and synchronized data capture. Use Value: Three 16-bit timers enable precise 10ms/100ms/1s intervals; programmable watchdog ensures recovery from relay driver lockup; 256-byte RAM stores calibration coefficients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS80C320-MCL | Same core, 33MHz max clock, 4.25V–5.5V supply - no low-voltage operation | Requires 5V-only design; unsuitable for battery-powered systems | Select when maximum performance in 5V industrial environment is required and power supply headroom permits |
| AT89C51RD2-SLSUM | 8051-compatible with 64kB Flash, 1.8V–5.5V, single UART, no dual DPTR or stretch MOVX | Lacks second UART, programmable watchdog, and memory timing flexibility | Select when on-chip Flash simplifies programming but advanced peripherals and timing control are not needed |
Compared with DS80C320-MCL, DS80C323-MCD trades peak speed for wider voltage range and lower power; compared with AT89C51RD2-SLSUM, it offers superior peripheral integration and deterministic memory timing control at the cost of external program memory dependency.
Availability
DS80C323-MCD is available at Aetrix Electronics and suitable for industrial PLC modules, smart sensor nodes, legacy medical device upgrades, and test equipment front-end controllers requiring stable component supply across extended product lifecycles.
Supply support for DS80C323-MCD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for industrial, automotive, and communications markets.
The DS80C323-MCD belongs to Maxim's high-speed 8051 microcontroller family, engineered to deliver 2.5× average performance uplift over legacy 80C32 while maintaining full software and pin compatibility for seamless system upgrades.
FAQ
What is the operating voltage range of the DS80C323-MCD?
The DS80C323-MCD operates from 2.7V to 5.5V, enabling deployment in both battery-powered portable instruments and standard 5V industrial control systems. This wide range eliminates the need for level-shifting circuitry when interfacing with diverse peripheral voltage domains, and the internal power-fail detection remains functional across the entire span. DS80C323-MCD's low-voltage capability directly supports energy-efficient designs where supply rails may sag under load.
How does the DS80C323-MCD achieve backward compatibility with 80C32 code?
The DS80C323-MCD maintains full 80C32 instruction set and pin compatibility, with timers defaulting to 12-clock-per-cycle operation after reset to preserve existing baud rates and timing loops. Its dual data pointer and stretch MOVX features reside in new SFR locations (82h–86h, 8Eh) that do not overlap standard 8051 registers, ensuring legacy firmware executes unchanged. DS80C323-MCD requires no code modification unless exploiting new peripherals like the second UART or programmable watchdog.
Can the DS80C323-MCD's second UART operate simultaneously with the first?
Yes, the DS80C323-MCD supports concurrent operation of both hardware UARTs - Port 0 (P3.0/P3.1) and Port 1 (P1.2/P1.3) - each with independent control registers (SCON0/C0h and SCON1/C0h) and buffers (SBUF0/C0h and SBUF1/C1h). They can run at different baud rates using separate timer sources, enabling simultaneous host communication and peripheral telemetry. DS80C323-MCD's dual UART implementation eliminates software bit-banging overhead in multi-interface systems.
What is the purpose of the CKCON register in the DS80C323-MCD?
The CKCON register (SFR 8Eh) controls timing behavior of MOVX data transfers and timer/counter clock sources. Bits CKCON.2–0 configure MOVX stretch (2–9 machine cycles) to match slow peripherals; CKCON.3–5 individually select 4- or 12-clock modes for Timer 0/1/2. This allows DS80C323-MCD to interface with legacy 150ns RAM while running core logic at full speed - a capability absent in standard 80C32. DS80C323-MCD defaults to 3-cycle MOVX and 12-clock timers for plug-and-play compatibility.
Does the DS80C323-MCD include on-chip program memory?
No, the DS80C323-MCD contains no on-chip ROM or Flash - it relies on external program memory accessed via P0 (AD0–AD7), P2 (A8–A15), and PSEN. It does include 256 bytes of on-chip scratchpad RAM for stack and register storage. This architecture mirrors the original 80C32, allowing direct replacement in systems already using external EPROM or Flash. DS80C323-MCD's external memory interface supports up to 64kB program and 64kB data space with configurable timing via CKCON.
DS80C323-MCD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Series:
- 80C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 18MHz
- Connectivity:
- EBI/EMI, SIO, UART/USART
- Peripherals:
- Power-Fail Reset, WDT
- Number of I/O:
- 32
- Program Memory Size:
- -
- Program Memory Type:
- ROMless
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- External
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
DS80C323-MCD FAQ
1.How can I place an order for DS80C323-MCD through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C323-MCD on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS80C323-MCD reliable?
The price and inventory of DS80C323-MCD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C323-MCD is usually 5 days.
3.What payment methods are accepted for DS80C323-MCD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C323-MCD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C323-MCD?
DS80C323-MCD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C323-MCD order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS80C323-MCD?
For technical support, including DS80C323-MCD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C323-MCD requirements.
6.How does Aetrix verify that DS80C323-MCD is sourced from the original manufacturer or authorized distributors?
All DS80C323-MCD products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS80C323-MCD meets industry standards.
7.What is the process for return or replacement of DS80C323-MCD?
All DS80C323-MCD units undergo pre-shipment inspection (PSI). If there is an issue with DS80C323-MCD, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS80C323-MCD part is unused and in its original packaging.
Return procedure for DS80C323-MCD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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