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Analog Devices Inc./Maxim Integrated DS80C323-ECD+
- Part No.:
- DS80C323-ECD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-TQFP
- Datasheet:
-
DS80C323-ECD+.pdf
- Description:
- IC MCU 8BIT ROMLESS 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:320
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Product details
Overview
DS80C323-ECD+ 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-based industrial control, instrumentation, and embedded communication systems requiring pin-compatible performance uplift.
For engineers reviewing the DS80C323-ECD+ datasheet, DS80C323-ECD+ pinout, DS80C323-ECD+ application, or DS80C323-ECD+ equivalent, key selection considerations include its 2.7–5.5V supply range, 44-pin TQFP package, dual UART support, stretchable MOVX timing (2–9 machine cycles), and dual data pointer for accelerated memory block moves - all while maintaining full 8051 instruction set compatibility.
Technical Context
The DS80C323-ECD+ implements a redesigned 8051 core executing most instructions in 4 oscillator cycles (vs. 12 in standard 80C32), delivering ~2.5× average speed improvement without code changes. Its dual data pointer (DPTR0/DPTR1) enables single-instruction switching between source and destination addresses during MOVX operations.
Peripheral timing is decoupled: timers default to 12-clock mode post-reset for backward baud rate compatibility but can be reconfigured via CKCON register (SFR 8Eh) to 4-clock operation. MOVX access speed is software-selectable (2–9 machine cycles) using CKCON.2–0 bits, enabling seamless interfacing with both fast SRAM and slow peripherals like LCD controllers or legacy UARTs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C32-compatible 8-bit CPU with 4-clock-per-machine-cycle execution |
| Max Clock Frequency | 18MHz crystal input - supports real-time throughput up to ~4.5MIPS |
| Supply Voltage Range | 2.7V to 5.5V - enables direct replacement in battery-powered or mixed-voltage 5V systems |
| On-Chip RAM | 256 bytes scratchpad RAM - sufficient for stack and local variables without external dependency |
| Serial Interfaces | Two independent full-duplex UARTs - one on P3.0/P3.1, second on P1.2/P1.3; both support programmable baud rates |
| Memory Addressing | 64kB program space (ROM/Flash) + 64kB data space (RAM/peripherals) - standard 8051 memory map with extended timing flexibility |
| Interrupt Sources | 13 total interrupts including six external (INT0–INT5), two serial, three timers, power-fail, and watchdog - supports responsive real-time event handling |
Pinout & Package
DS80C323-ECD+ is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8mm lead pitch, RoHS-compliant, and rated for 0°C to +70°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 16,17) | Power Supply | 2.7V–5.5V main supply - supports wide-input industrial/battery applications |
| GND (Pin 4) | Digital Ground | Reference return path for all digital I/O and core logic |
| RST (Pin 14) | Reset Input | Schmitt-triggered active-high reset with internal pulldown - eliminates need for external RC network |
| XTAL1 (Pin 15), XTAL2 (Pin 15) | Oscillator Interface | Connects to parallel-resonant AT-cut crystal or external clock source; XTAL1 accepts external clock input |
| P0.0–P0.7 (Pins 38–31) | Multiplexed Address/Data Bus | Provides lower 8 address bits (A0–A7) and bidirectional data bus during MOVX; requires external latch when used as address bus |
| P1.0–P1.7 (Pins 40–44,1–3) | General-Purpose I/O / Alternate Functions | Supports Timer2 I/O (P1.0/P1.1), Serial Port 1 (P1.2/P1.3), and five external interrupts (P1.4–P1.7) |
| P2.0–P2.7 (Pins 18–25) | Upper Address Bus (A8–A15) | Outputs upper address byte during external memory access; value latched internally for MOVX @Ri operations |
| P3.0–P3.7 (Pins 5,7–13) | Multifunction I/O / Peripherals | Provides Serial Port 0 (P3.0/P3.1), INT0/INT1 (P3.2/P3.3), Timer inputs (P3.4/P3.5), WR/ RD strobes (P3.6/P3.7) |
| EA (Pin 29) | External Access Enable | Must be tied LOW to disable internal ROM and enable external program memory access |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte memory block move from 1869 to 1097 machine cycles - saves 123.5μs at 25MHz |
| Variable MOVX Timing (CKCON.2–0) | Configurable 2–9 machine cycle data memory access - eliminates glue logic for mixed-speed peripherals |
| Programmable Watchdog Timer | Prevents system lockup via configurable timeout and automatic reset - critical for unattended embedded operation |
| Early Warning Power-Fail Interrupt | Generates interrupt before VCC drops below reset threshold - enables safe state save and controlled shutdown |
| Second Hardware UART (Serial Port 1) | Full-duplex asynchronous interface on P1.2/P1.3 - supports simultaneous host/debug and peripheral communication |
Applications
| Industrial PLC I/O Module | Smart Sensor Hub |
|---|---|
Use Scenario: Compact programmable logic controller module managing discrete I/O, analog monitoring, and fieldbus communication in factory automation. IC Role / Device Role / Timing Role: Primary 8-bit controller executing ladder logic, scanning sensors/actuators, and driving RS-485 Modbus RTU via Serial Port 0 while Serial Port 1 handles local debug or HMI interface. Use Value: Dual UARTs eliminate need for external UART expansion; 2.7–5.5V operation ensures robustness across varying plant power rails; dual DPTR accelerates sensor data buffering. | Use Scenario: Battery-powered environmental sensor node aggregating temperature, humidity, and CO₂ readings before transmitting via LoRaWAN gateway. IC Role / Device Role / Timing Role: Central coordinator reading multiple I²C/SPI sensors, performing basic calibration, and managing low-power sleep/wake cycles using programmable watchdog and power-fail detection. Use Value: Wide voltage range extends battery life; early-warning power-fail interrupt triggers last-gasp data save to EEPROM; stretchable MOVX accommodates slow EEPROM write timing. |
| Legacy Medical Device Upgrade | Test Equipment Front-End Controller |
Use Scenario: Retrofit of aging ECG monitor where original 80C32 limits sampling rate and display refresh due to processing bottlenecks. IC Role / Device Role / Timing Role: Drop-in replacement MCU executing same firmware with 2.5× faster instruction throughput, enabling higher ADC sampling and real-time waveform rendering. Use Value: Pin- and code-compatible upgrade requires no PCB change; 4-clock core speeds up time-critical signal processing loops without altering timing-critical peripherals. | Use Scenario: Modular benchtop instrument front-end handling user keypad, LCD display, relay control, and GPIB/RS-232 host communication. IC Role / Device Role / Timing Role: System manager coordinating human interface, relay actuation, and dual serial links - one for instrument control (P3.0/P3.1), one for diagnostics (P1.2/P1.3). Use Value: Two independent UARTs simplify firmware architecture; dual DPTR optimizes display buffer updates; programmable watchdog ensures recovery from GUI hang. |
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-ECL+ | Same pinout and feature set, but 33MHz max clock and 4.25–5.5V only supply range | Better suited for high-speed 5V-only systems needing maximum throughput; not suitable for 2.7–3.6V battery operation | Select DS80C320-ECL+ only if design requires >18MHz operation and operates strictly at 5V. |
| AT89C51ED2-RLTUM | Enhanced 8051 with 64kB Flash, USB interface, and 33MHz max; different pinout (44-pin TQFP but incompatible signal mapping) | Requires PCB redesign; adds USB host capability but lacks DS80C323-ECD+'s early-warning power-fail interrupt and dual DPTR optimization | Choose AT89C51ED2-RLTUM only when USB connectivity is mandatory and board revision is feasible. |
Compared with DS80C320-ECL+, DS80C323-ECD+ trades maximum clock speed for wider voltage flexibility and lower power operation; compared with AT89C51ED2-RLTUM, it offers true pin-compatible legacy upgrade path and specialized low-level timing features (stretch MOVX, dual DPTR) critical for deterministic embedded control.
Availability
DS80C323-ECD+ is available at Aetrix Electronics and suitable for industrial PLC modules, smart sensor hubs, legacy medical device upgrades, test equipment front-ends, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and drop-in 8051 performance enhancement.
Supply support for DS80C323-ECD+ 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, communications, and computing markets.
The DS80C323-ECD+ belongs to Maxim's high-speed 8051-compatible microcontroller family, engineered specifically to deliver deterministic real-time performance, robust power management, and seamless migration path for legacy 80C32-based systems.
FAQ
What is the operating voltage range of the DS80C323-ECD+?
The DS80C323-ECD+ operates from 2.7V to 5.5V, making it suitable for both battery-powered devices and legacy 5V industrial systems. This wide range allows direct replacement of older 5V-only 80C32 variants while supporting modern low-voltage designs - a key differentiator from the DS80C320-ECL+, which requires minimum 4.25V. The DS80C323-ECD+ maintains full functionality across this entire span without performance degradation.
Does the DS80C323-ECD+ require external pull-up resistors on Port 0?
Yes, the DS80C323-ECD+ Port 0 (P0.0–P0.7) has no internal pull-ups and functions as a multiplexed address/data bus. External pull-up resistors (typically 4.7kΩ) are required when Port 0 is used as a general-purpose I/O port or during external memory read/write cycles where bus contention must be avoided. This behavior matches standard 80C32 operation and is explicitly documented in the DS80C323-ECD+ pin description section for P0.
How does the dual data pointer in DS80C323-ECD+ improve memory transfer efficiency?
The DS80C323-ECD+ implements two independent 16-bit data pointers (DPTR0 at SFR 82h/83h and DPTR1 at 84h/85h), selected via DPS bit (SFR 86h). This eliminates the need to save/restore address registers during block moves: a single INC DPS instruction switches context. In a 64-byte transfer, this reduces machine cycles from 1869 to 1097 - a 41% reduction - directly accelerating firmware tasks like display buffer updates or sensor data logging in the DS80C323-ECD+.
Can the DS80C323-ECD+ use the same crystal oscillator as an original 80C32 design?
Yes, the DS80C323-ECD+ is fully compatible with crystals used in legacy 80C32 systems, but its maximum supported frequency is 18MHz (vs. 12MHz typical for 80C32). When using the same crystal, the DS80C323-ECD+ executes instructions ~2.5× faster due to its 4-clock-per-cycle architecture - meaning existing timing loops will run proportionally faster unless adjusted. For unchanged real-time behavior, software must scale delay loops or configure timers to retain 12-clock mode via CKCON register.
What is the purpose of the "stretch MOVX" feature in DS80C323-ECD+?
The stretch MOVX feature in DS80C323-ECD+ allows software to configure external data memory access timing from 2 to 9 machine cycles via CKCON.2–0 bits. This enables reliable interfacing with slow peripherals (e.g., character LCDs, EEPROMs, or legacy UARTs) without external wait-state logic. On reset, DS80C323-ECD+ defaults to 3-cycle MOVX - ensuring compatibility with standard 120ns RAM - and can be optimized to 2 cycles for peak performance when fast memory is used.
DS80C323-ECD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-TQFP
- Series:
- 80C
- Packaging:
- Tray
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
DS80C323-ECD+ FAQ
1.How can I place an order for DS80C323-ECD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C323-ECD+ 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-ECD+ reliable?
The price and inventory of DS80C323-ECD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C323-ECD+ is usually 5 days.
3.What payment methods are accepted for DS80C323-ECD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C323-ECD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C323-ECD+?
DS80C323-ECD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C323-ECD+ 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-ECD+?
For technical support, including DS80C323-ECD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C323-ECD+ requirements.
6.How does Aetrix verify that DS80C323-ECD+ is sourced from the original manufacturer or authorized distributors?
All DS80C323-ECD+ 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-ECD+ meets industry standards.
7.What is the process for return or replacement of DS80C323-ECD+?
All DS80C323-ECD+ units undergo pre-shipment inspection (PSI). If there is an issue with DS80C323-ECD+, 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-ECD+ part is unused and in its original packaging.
Return procedure for DS80C323-ECD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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