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Analog Devices Inc./Maxim Integrated DS80C323-QND/T&R
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- Part No.:
- DS80C323-QND/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS80C323-QND/T&R.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,691
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Product details
Overview
DS80C323-QND/T&R from Maxim Integrated is a high-speed, low-power 80C32-compatible 8-bit microcontroller with 256 bytes of on-chip RAM, dual hardware serial ports, three 16-bit timer/counters, and 4-clock-per-machine-cycle architecture enabling single-cycle instructions in 121ns at 18MHz. It operates from 2.7V to 5.5V and targets industrial control, embedded instrumentation, and legacy 8051 system upgrades requiring extended temperature support.
For engineers reviewing the DS80C323-QND/T&R datasheet, DS80C323-QND/T&R pinout, DS80C323-QND/T&R application, or DS80C323-QND/T&R equivalent, key selection considerations include its -40°C to +85°C operating range, 44-pin PLCC package, dual DPTR acceleration for memory moves, programmable MOVX stretch timing, and power-fail reset/interrupt functionality - all while maintaining 8051 software compatibility.
Technical Context
The DS80C323-QND/T&R implements a redesigned 8051 core executing instructions in 4 clocks per machine cycle (vs. 12 in standard 80C32), delivering up to 2.5× average speed improvement without code changes. Its dual data pointers (DPTR0/DPTR1) and configurable MOVX access timing (2–9 machine cycles via CKCON register) enable efficient interfacing with heterogeneous memory and peripherals.
It integrates power management features including early-warning power-fail interrupt, programmable watchdog timer, and internal power-fail reset - all accessible via dedicated SFRs. Timer/counter operation defaults to 12-clock mode for backward timing compatibility but supports 4-clock mode via CKCON bits for higher-resolution timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C32-compatible 8-bit CPU with 4-clock-per-cycle execution |
| Max Clock Speed | 18MHz crystal input - enables 121ns single-cycle instruction execution |
| Operating Voltage | 2.7V to 5.5V - supports battery-powered and mixed-voltage industrial systems |
| Temperature Range | -40°C to +85°C - qualified for extended industrial environments |
| On-Chip RAM | 256 bytes scratchpad RAM - sufficient for stack and local variables without external SRAM |
| Serial Interfaces | Two full-duplex UARTs - Serial Port 0 (P3.0/P3.1) and Serial Port 1 (P1.2/P1.3) |
| Timer/Counters | Three 16-bit timers/counters - Timer 0, Timer 1, and Timer 2 with capture/reload capability |
| Interrupt Sources | 13 total interrupts - six external (INT0–INT5), seven internal (serial, timer, power-fail) |
Pinout & Package
DS80C323-QND/T&R is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry, designed for surface-mount assembly and thermal reliability in industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply | +2.7V to +5.5V supply input - powers core and I/O; decoupling required near pin |
| GND | Ground Reference | Digital ground return - must be connected to low-impedance system ground plane |
| RST | Reset Input | Active-high Schmitt-triggered reset - internal pulldown eliminates need for external RC network |
| XTAL1 / XTAL2 | Crystal Oscillator Interface | Supports parallel-resonant AT-cut crystals up to 18MHz; XTAL1 accepts external clock source |
| P0.0–P0.7 (AD0–AD7) | Multiplexed Address/Data Bus | Low-order address/data lines - requires external latch (e.g., 74LS373) controlled by ALE |
| P1.0–P1.7 | General-Purpose I/O / Alternate Functions | Includes T2/T2EX, RXD1/TXD1, and INT2–INT5 - enables flexible peripheral routing |
| P2.0–P2.7 (A8–A15) | High-Order Address Bus | Provides MSB address for 64kB external memory mapping - automatically driven during MOVX |
| P3.0–P3.7 | General-Purpose I/O / Alternate Functions | Includes RXD0/TXD0, INT0/INT1, T0/T1, WR/RD - essential for memory and serial interface control |
| EA | External Access Control | Must be tied low - forces all program fetches from external ROM; no internal ROM present |
| ALE | Address Latch Enable | Output pulse (1.5 XTAL1 cycles) strobes P0 address LSB into external latch |
| PSEN | Program Store Enable | Active-low ROM chip select - pulses every 4 XTAL1 cycles during opcode fetch |
| WR / RD | Memory Write/Read Strobes | Control external RAM/peripheral access timing - synchronized with MOVX execution |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointers (DPTR0/DPTR1) | Reduces 64-byte block memory move cycles from 1869 to 1097 at 25MHz - accelerates firmware updates and buffer handling |
| Configurable MOVX Timing (CKCON) | Adjusts external data memory access from 2 to 9 machine cycles - eliminates glue logic when interfacing slow peripherals like LCDs or UARTs |
| Power-Fail Detection & Reset | Generates early-warning interrupt before brownout and automatic reset below threshold - prevents corrupted EEPROM writes |
| Programmable Watchdog Timer | Independent timeout counter with software-reset capability - ensures recovery from runaway code in unattended systems |
| Second Hardware UART (Serial Port 1) | Full-duplex UART on P1.2/P1.3 with dedicated SCON1/SBUF1 registers - enables simultaneous host/debug and sensor communication |
| 13-Source Interrupt System | Six external interrupt pins (INT0–INT5) with edge-selectable polarity - supports real-time event capture from multiple sensors or fieldbus nodes |
Applications
| Industrial PLC I/O Module | Smart Sensor Node |
|---|---|
Use Scenario: Compact remote I/O unit collecting analog/digital signals from factory floor sensors and relaying data via RS-485. IC Role / Device Role / Timing Role: Main controller managing ADC sampling, digital input debouncing, and dual-serial protocol bridging (Modbus RTU on Port 0, ASCII debug on Port 1). Use Value: Dual UARTs eliminate external multiplexer; 2.7V–5.5V operation accommodates 3.3V sensor rails and 5V actuator drivers; -40°C to +85°C rating ensures reliability in unconditioned enclosures. | Use Scenario: Battery-powered environmental monitor logging temperature/humidity and transmitting over LoRaWAN gateway. IC Role / Device Role / Timing Role: Low-power system orchestrator - wakes on timer interrupt, reads sensors via I²C/SPI, formats packet, and triggers RF module via UART. Use Value: 2.7V minimum supply extends battery life; programmable watchdog prevents lockup during RF transmission; power-fail interrupt safeguards flash write integrity during voltage sag. |
| Legacy 8051 Equipment Upgrade | Embedded HMI Controller |
Use Scenario: Retrofitting aging medical device firmware to improve response time without changing PCB layout or external memory. IC Role / Device Role / Timing Role: Drop-in replacement for 80C32 - executes same hex code at 2.5× speed while preserving pinout and memory map. Use Value: 44-pin PLCC matches original footprint; 12-clock timer default maintains legacy baud rates; dual DPTR accelerates display buffer refresh without code rewrite. | Use Scenario: Local operator interface for HVAC control panel with keypad, LED indicators, and serial display driver. IC Role / Device Role / Timing Role: Real-time coordinator - scans matrix keypad, updates LED states, drives character LCD via 4-bit interface, and communicates with main controller via UART. Use Value: 13 interrupt sources handle concurrent keypad press, button release, and fault alerts; MOVX stretch timing adapts to slow LCD controller timing; -40°C to +85°C ensures outdoor kiosk operation. |
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-QNG+ | Same pinout and feature set but rated for 33MHz max clock and 0°C to +70°C range - higher speed, narrower temp grade | Preferred for cost-sensitive commercial equipment where extended temperature is unnecessary | Select DS80C320-QNG+ only if 33MHz operation is required and ambient temperature stays within 0°C–70°C |
| AT89C51RD2-RLTUM | Atmel 8051 derivative with 64kB Flash, 1.25kB RAM, and ISP capability - no dual UART or power-fail detection | Better suited for new designs requiring in-system programming and larger code space, but lacks DS80C323-QND/T&R's industrial safety features | Choose AT89C51RD2-RLTUM for prototyping or low-volume production where Flash reprogrammability outweighs power-fail resilience |
Compared with DS80C320-QNG+, DS80C323-QND/T&R trades maximum clock speed for wider temperature range and lower voltage operation - making it superior for harsh environments. Compared with AT89C51RD2-RLTUM, it offers deterministic power-fail response and dual UARTs at the expense of on-chip Flash, favoring mission-critical industrial deployments over flexible development.
Availability
DS80C323-QND/T&R is available at Aetrix Electronics and suitable for industrial automation, smart sensor nodes, and legacy 8051 system upgrades requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DS80C323-QND/T&R 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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and automotive applications.
The DS80C323-QND/T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, engineered to deliver deterministic real-time performance, robust power management, and seamless migration path for legacy 80C32-based systems in demanding environments.
FAQ
What is the maximum operating frequency of the DS80C323-QND/T&R?
The DS80C323-QND/T&R supports a maximum crystal frequency of 18MHz, enabling single-cycle instruction execution in 121ns. This frequency is guaranteed across its full -40°C to +85°C operating temperature range and 2.7V to 5.5V supply voltage, making it suitable for timing-critical industrial applications where thermal stability is essential. The DS80C323-QND/T&R does not support frequencies above 18MHz, even at room temperature.
Does the DS80C323-QND/T&R include on-chip program memory?
No, the DS80C323-QND/T&R does not contain on-chip ROM or Flash memory. It relies entirely on external program memory accessed via the multiplexed P0 address/data bus and P2 high-order address lines. The EA pin must be tied low to enable external program fetches. This architecture mirrors the original 80C32 and allows designers to select appropriate EPROM, EEPROM, or NOR Flash devices based on code size and update requirements - a key consideration for the DS80C323-QND/T&R's use in field-upgradable systems.
How does the dual data pointer feature improve performance in the DS80C323-QND/T&R?
The DS80C323-QND/T&R implements two independent 16-bit data pointers (DPTR0 at 82h/83h and DPTR1 at 84h/85h), selected via the DPS bit at SFR 86h. This eliminates the need to save and restore address registers during memory block transfers. For example, a 64-byte move executes in 1097 machine cycles instead of 1869 - a 41% reduction - directly accelerating firmware updates, display buffering, and communication protocol framing in the DS80C323-QND/T&R.
Can the DS80C323-QND/T&R operate from a 3.3V supply?
Yes, the DS80C323-QND/T&R is fully specified to operate from 2.7V to 5.5V, making it compatible with standard 3.3V logic systems. At 3.3V, it maintains full functionality including 18MHz operation, dual UARTs, and all interrupt sources. This voltage flexibility allows direct interfacing with 3.3V sensors, transceivers, and level-shift-free communication with modern peripherals - a critical advantage of the DS80C323-QND/T&R in mixed-voltage industrial designs.
What packaging and lead finish does the DS80C323-QND/T&R use?
The DS80C323-QND/T&R is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry and RoHS-compliant lead-free finish (denoted by the '+' suffix in DS80C323-QND+). The PLCC package provides robust mechanical mounting, excellent thermal dissipation for industrial ambient temperatures, and compatibility with standard surface-mount reflow profiles. This specific variant - DS80C323-QND/T&R - is tape-and-reel packaged for automated assembly, ensuring consistent placement accuracy in high-volume manufacturing of DS80C323-QND/T&R-based systems.
DS80C323-QND/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 80C
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
DS80C323-QND/T&R FAQ
1.How can I place an order for DS80C323-QND/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C323-QND/T&R 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-QND/T&R reliable?
The price and inventory of DS80C323-QND/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C323-QND/T&R is usually 5 days.
3.What payment methods are accepted for DS80C323-QND/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C323-QND/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C323-QND/T&R?
DS80C323-QND/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C323-QND/T&R 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-QND/T&R?
For technical support, including DS80C323-QND/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C323-QND/T&R requirements.
6.How does Aetrix verify that DS80C323-QND/T&R is sourced from the original manufacturer or authorized distributors?
All DS80C323-QND/T&R 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-QND/T&R meets industry standards.
7.What is the process for return or replacement of DS80C323-QND/T&R?
All DS80C323-QND/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS80C323-QND/T&R, 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-QND/T&R part is unused and in its original packaging.
Return procedure for DS80C323-QND/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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