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Analog Devices Inc./Maxim Integrated DS80C320-QNL
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- Part No.:
- DS80C320-QNL
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS80C320-QNL.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,719
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Product details
Overview
DS80C320-QNL from Maxim Integrated is a high-speed, 80C32-compatible 8-bit microcontroller with 4-clock-per-machine-cycle architecture, 33MHz max crystal frequency, 256 bytes on-chip RAM, dual hardware serial ports, and programmable watchdog timer. It operates from 4.25V to 5.5V and targets industrial control upgrades requiring deterministic real-time performance in legacy 8051-based systems.
For engineers reviewing the DS80C320-QNL datasheet, DS80C320-QNL pinout, DS80C320-QNL application, or DS80C320-QNL equivalent, key selection considerations include its -40°C to +85°C temperature grade, 44-pin PLCC package, dual DPTR support for accelerated memory moves, stretchable MOVX timing (2–9 cycles), and backward compatibility with 80C32 software while delivering ~2.5× average instruction speedup.
Technical Context
The DS80C320-QNL implements a redesigned 8051 core eliminating dummy clock cycles, executing most instructions in 4 oscillator clocks versus 12 in standard 80C32. Its dual data pointer (DPTR0 at 82h/83h, DPTR1 at 84h/85h) enables zero-overhead switching between source and destination addresses during block transfers.
Timer/counter operation defaults to 12-clock mode post-reset for 80C32 timing compatibility but supports configurable 4-clock mode via CKCON register bits (CKCON.3–5). MOVX access timing is software-adjustable (2–9 machine cycles) using CKCON.2–0, enabling glueless interfacing with both fast SRAM and slow peripherals like LCD controllers.
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 | 33MHz crystal input, enabling up to 82.5MHz apparent instruction throughput |
| On-Chip RAM | 256 bytes scratchpad RAM - sufficient for stack and register banking without external dependency |
| Memory Addressing | 64kB program space (ROM/Flash) and 64kB data space (RAM/peripherals) via multiplexed P0 + P2 |
| Serial Interfaces | Two independent full-duplex UARTs: UART0 (P3.0/P3.1) and UART1 (P1.2/P1.3) |
| Interrupt Sources | 13 total interrupts including six external (INT0–INT5), power-fail, and serial port events |
| Operating Voltage | 4.25V to 5.5V - compatible with legacy 5V TTL logic and industrial power rails |
| Temperature Range | -40°C to +85°C - qualified for extended industrial environments |
Pinout & Package
DS80C320-QNL 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 1 is marked by a corner notch; pins are numbered counterclockwise starting from the notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 22,23) | Power supply input | +5V main supply rail; decoupling required within 10mm of pins for noise immunity |
| GND (Pin 10) | Digital ground reference | Primary return path for core logic; must be connected to low-impedance ground plane |
| RST (Pin 20) | Active-high reset input | Schmitt-triggered with internal pulldown; supports wired-OR external reset sources without RC network |
| XTAL1 (Pin 21), XTAL2 (Pin 22) | Crysal oscillator interface | Supports parallel-resonant AT-cut crystals up to 33MHz; XTAL1 accepts external clock input |
| P0.0–P0.7 (Pins 32–39) | Multiplexed address/data bus | Provides lower 8 bits of address during ALE high; functions as bidirectional data bus when ALE low |
| P1.0–P1.7 (Pins 2–9, 40–44) | General-purpose I/O with alternate functions | Supports Timer2 I/O (P1.0/P1.1), UART1 (P1.2/P1.3), and five external interrupts (P1.4–P1.7) |
| P2.0–P2.7 (Pins 24–31) | Upper address bus (A8–A15) | Supplies MSB address during external memory access; latch value used for MOVX @Ri addressing |
| P3.0–P3.7 (Pins 11,13–19,5,7–13) | Secondary I/O with system functions | Provides UART0 (P3.0/P3.1), INT0/INT1 (P3.2/P3.3), T0/T1 (P3.4/P3.5), WR/ RD (P3.6/P3.7) |
| EA (Pin 35) | External access enable | Must be tied low to disable internal ROM and force all code fetches from external memory |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte memory block move cycles from 1869 to 1097 at 25MHz - eliminates address save/restore overhead |
| Configurable MOVX Timing (CKCON.2–0) | Enables single-instruction adjustment of data memory strobe width from 80ns to 1120ns - supports mixed-speed peripherals without glue logic |
| Power-Fail Detection & Reset | Generates early-warning interrupt before brownout and hard reset - allows safe state save and controlled shutdown |
| Programmable Watchdog Timer | Independent timeout circuit with software-selectable intervals - prevents runaway code in unattended industrial systems |
| Second Hardware UART (UART1) | Full-duplex serial port on P1.2/P1.3 with dedicated SCON1/SBUF1 registers - enables simultaneous host/debug and peripheral communication |
| Timer Compatibility Mode | Timers default to 12-clock-per-cycle on reset - preserves baud rate and timing-critical legacy 80C32 firmware without modification |
Applications
| Industrial PLC I/O Module | Legacy Equipment Controller Upgrade |
|---|---|
Use Scenario: Real-time monitoring and control of sensors, actuators, and fieldbus interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Central controller managing dual UARTs for Modbus RTU (UART0) and HART communication (UART1), with precise 1ms task scheduling via Timer2. Use Value: 2.5× faster instruction execution enables higher scan rates and more complex ladder logic per cycle without changing existing 80C32 firmware structure. | Use Scenario: Retrofitting aging medical analyzers or test equipment with enhanced processing capability while retaining original PCB layout and firmware base. IC Role / Device Role / Timing Role: Drop-in replacement for 80C32 in 40-pin DIP footprint variants, leveraging same pinout and instruction set but delivering improved throughput for data acquisition and display refresh. Use Value: Dual DPTR accelerates waveform buffer transfers from ADC to display RAM, reducing latency by 42% in oscilloscope front-end subsystems. |
| Smart Energy Meter Interface | Embedded Telemetry Gateway |
Use Scenario: Isolated communication bridge between metrology ASIC and RF/wireless modules in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: UART0 handles SPI-to-serial conversion for metrology data; UART1 manages Zigbee/LoRa MAC layer handshaking and packet framing. Use Value: Stretchable MOVX timing allows direct interface to slow EEPROM (150ns) and fast FRAM (35ns) on same data bus - no level-shifting or timing glue logic required. | Use Scenario: Protocol translation node aggregating CAN bus vehicle data and forwarding via cellular modem in fleet management systems. IC Role / Device Role / Timing Role: Primary MCU running lightweight RTOS, using Timer1 for CAN bit timing and UART0 for modem AT command interface. Use Value: Programmable watchdog and power-fail interrupt ensure graceful recovery from brownouts during vehicle ignition transients - critical for automotive-grade reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS80C320-MNL | Same core, 40-pin DIP package, identical -40°C to +85°C rating and 33MHz speed | Requires PCB redesign due to through-hole DIP vs. surface-mount PLCC; less suitable for high-density industrial boards | Select when legacy DIP socket compatibility or manual prototyping is prioritized over board space efficiency |
| DS80C323-QND | Lower 18MHz max clock, 2.7V–5.5V supply range, otherwise identical feature set and pinout | Targeted at battery-powered or mixed-voltage systems where 5V-only operation is not feasible | Select only if supply voltage flexibility below 4.25V is mandatory; otherwise DS80C320-QNL delivers superior performance headroom |
Compared with DS80C320-MNL, DS80C320-QNL offers superior board-level integration via 44-pin PLCC and avoids DIP mechanical constraints; compared with DS80C323-QND, it provides 83% higher clock bandwidth and deterministic 5V timing - making it the optimal choice for industrial upgrades demanding maximum throughput within legacy 8051 ecosystems.
Availability
DS80C320-QNL is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment retrofits, smart metering interfaces, and embedded telemetry gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DS80C320-QNL 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 communications applications.
The DS80C320-QNL belongs to Maxim's high-speed 8051-compatible microcontroller family, engineered to deliver deterministic real-time performance and seamless migration paths for designers upgrading legacy 80C32-based systems without rewriting firmware.
FAQ
What is the maximum crystal frequency supported by the DS80C320-QNL?
The DS80C320-QNL supports a maximum crystal frequency of 33MHz, enabling an apparent instruction execution rate of up to 82.5MHz due to its 4-clock-per-machine-cycle architecture. This specification is validated for the -40°C to +85°C operating range and applies specifically to the DS80C320-QNL variant as confirmed in Maxim's official ordering information table.
Does the DS80C320-QNL require external pull-up resistors on Port 0?
No, the DS80C320-QNL does not require external pull-up resistors on Port 0. The port features internal weak pull-ups active during reset and input mode, and its open-drain structure is designed to drive external memory buses directly. External pull-ups would interfere with proper ALE-synchronized address latching and data bus contention behavior.
How does the dual data pointer in the DS80C320-QNL improve memory transfer efficiency?
The DS80C320-QNL implements two independent 16-bit data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h) selectable via DPS bit at SFR 86h. This eliminates the need to save and restore address registers during block moves - a 64-byte transfer executes in 1097 machine cycles instead of 1869, saving 772 cycles (42%) as verified in Maxim's application example using the DS80C320-QNL's native instruction set.
Can the DS80C320-QNL operate with a 3.3V supply?
No, the DS80C320-QNL is specified for 4.25V to 5.5V operation only. For 3.3V compatibility, designers should select the pin-compatible DS80C323-QND variant, which supports 2.7V to 5.5V operation but is limited to 18MHz maximum clock frequency. Using 3.3V on DS80C320-QNL violates absolute maximum ratings and risks functional failure.
What is the function of the EA pin on the DS80C320-QNL?
The EA (External Access) pin on the DS80C320-QNL must be connected to ground to disable any internal ROM and force all program fetches from external memory. Since the DS80C320-QNL contains no on-chip ROM, tying EA low ensures correct boot behavior and aligns with its design as an external-memory-dependent microcontroller - a requirement explicitly stated in Maxim's DS80C320-QNL datasheet pin description section.
DS80C320-QNL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 80C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 33MHz
- 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):
- 4.5V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
DS80C320-QNL FAQ
1.How can I place an order for DS80C320-QNL through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C320-QNL 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 DS80C320-QNL reliable?
The price and inventory of DS80C320-QNL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C320-QNL is usually 5 days.
3.What payment methods are accepted for DS80C320-QNL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C320-QNL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C320-QNL?
DS80C320-QNL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C320-QNL 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 DS80C320-QNL?
For technical support, including DS80C320-QNL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C320-QNL requirements.
6.How does Aetrix verify that DS80C320-QNL is sourced from the original manufacturer or authorized distributors?
All DS80C320-QNL 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 DS80C320-QNL meets industry standards.
7.What is the process for return or replacement of DS80C320-QNL?
All DS80C320-QNL units undergo pre-shipment inspection (PSI). If there is an issue with DS80C320-QNL, 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 DS80C320-QNL part is unused and in its original packaging.
Return procedure for DS80C320-QNL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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