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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:3,521
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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-cycle architecture, 33MHz max crystal frequency, 256 bytes on-chip RAM, three 16-bit timer/counters, and dual hardware serial ports. It operates from –40°C to +85°C and targets industrial control, embedded instrumentation, and legacy 8051 system upgrades requiring deterministic real-time performance.
For engineers reviewing the DS80C320-QNL+ datasheet, DS80C320-QNL+ pinout, DS80C320-QNL+ application, or DS80C320-QNL+ equivalent, key selection considerations include its 4-clock core timing, programmable MOVX stretch for mixed-speed memory interfacing, dual DPTR acceleration for block data moves, and power-fail reset/interrupt support in extended temperature operation.
Technical Context
The DS80C320-QNL+ implements a redesigned 8051-compatible core eliminating wasted clock cycles-executing most instructions in 4 oscillator cycles versus 12 in standard 80C32, yielding up to 3× speed improvement at same crystal frequency. Its dual serial ports (UART0 on P3.0/P3.1, UART1 on P1.2/P1.3) operate independently with separate SFRs (SCON0/SCON1, SBUF0/SBUF1), enabling simultaneous multi-device communication.
Timer operation defaults to 12-clock mode for backward compatibility but supports 4-clock mode via CKCON register bits (CKCON.3–5). MOVX access timing is software-configurable from 2 to 9 machine cycles using CKCON.2–0, enabling direct interface to both fast SRAM and slow peripherals like LCD controllers 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 Frequency | 33MHz crystal input, enabling 82.5MHz apparent instruction throughput |
| Operating Temperature | –40°C to +85°C, qualified for industrial-grade reliability |
| On-Chip RAM | 256 bytes scratchpad RAM, no internal ROM-requires external program memory |
| Serial Interfaces | Two independent full-duplex UARTs with dedicated pins and SFRs |
| Memory Addressing | 64kB program space (ROM) and 64kB data space (RAM/peripherals) via multiplexed P0 + P2 |
| Interrupt Sources | 13 total interrupts: 6 external (INT0–INT5), 7 internal (serial, timers, power-fail) |
| Special Features | Dual data pointer (DPTR0/DPTR1), programmable watchdog timer, early-warning power-fail interrupt |
Pinout & Package
DS80C320-QNL+ is housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package with 0.050" lead pitch and JEDEC MS-026AC outline. Pin 1 is marked by a corner notch; leads are arranged in a square grid with pin 1 at top-left when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 22, 23) | Power supply | +5V nominal supply; device requires 4.25V–5.5V for guaranteed operation |
| GND (Pin 10) | Digital ground reference | Primary return path for all digital I/O and core logic; must be low-impedance |
| RST (Pin 20) | Active-high reset input | Schmitt-triggered input with internal pulldown; enables wired-OR reset sources without external RC |
| XTAL1 (Pin 21), XTAL2 (Pin 22) | Clock oscillator interface | Supports parallel-resonant AT-cut crystals up to 33MHz; XTAL1 accepts external clock source |
| P0.0–P0.7 (Pins 39–32) | 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) | Outputs MSB address during external memory access; latched value used for MOVX @Ri addressing |
| P3.0–P3.7 (Pins 11, 13–19, 5, 7–13) | Multi-function I/O port | 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 force all program fetches from external ROM; no internal code memory |
| N.C. (Pins 12, 34, 6, 28, 39) | No-connect terminals | Reserved for future family expansion; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte block memory move cycles from 1869 to 1097 at 25MHz-accelerating data transfers without additional code overhead |
| Programmable MOVX Stretch (CKCON.2–0) | Configures external data memory access from 2 to 9 machine cycles, enabling direct interface to 120ns SRAM or 1ms LCD controllers |
| Power-Fail Detection & Interrupt | Generates early-warning interrupt before VCC drops below 4.25V, allowing safe state save and controlled shutdown |
| Second Hardware UART (UART1) | Full-duplex serial port on P1.2/P1.3 with independent SCON1/SBUF1 registers-enables concurrent host and peripheral communication |
| Watchdog Timer with Programmable Timeout | Prevents system lockup via configurable timeout period; reset output asserts if not cleared within window |
| Timer Compatibility Mode | Timers default to 12-clock-per-cycle on reset-preserving baud rates and timing-critical legacy 8051 firmware without modification |
Applications
| Industrial PLC I/O Module | Legacy Medical Instrument Upgrade |
|---|---|
Use Scenario: Compact programmable logic controller module controlling solenoids, sensors, and HMI displays in factory automation cabinets. IC Role / Device Role / Timing Role: Primary controller executing ladder logic scans, managing dual UARTs for Modbus RTU master/slave communication, and monitoring power integrity. Use Value: 33MHz operation enables sub-millisecond scan times; power-fail interrupt ensures EEPROM-safe parameter backup before brownout. | Use Scenario: Retrofit of aging patient monitor front-end board requiring higher throughput for real-time waveform processing and dual serial telemetry links. IC Role / Device Role / Timing Role: Real-time data acquisition controller interfacing ADCs, driving character LCD, and relaying vitals via UART0 to display and UART1 to wireless transceiver. Use Value: Dual DPTR accelerates buffer-to-display transfers; extended –40°C to +85°C rating ensures reliability in clinical environments with variable ambient conditions. |
| Smart Energy Meter Communication Hub | Automotive Diagnostic Tool Interface |
Use Scenario: Two-way communication gateway in smart meter installations, bridging PLC/HPLC physical layer to RS-485 backhaul network. IC Role / Device Role / Timing Role: Protocol translation engine handling DLMS/COSEM parsing, managing secure serial bootloading, and detecting grid voltage sags. Use Value: Programmable MOVX stretch allows use of cost-effective 150ns SRAM while maintaining 9600-baud Modbus over noisy 485 lines. | Use Scenario: Handheld OBD-II diagnostic tool connecting to vehicle ECU via ISO 9141-2/K-line and simultaneously logging data to SD card via SPI. IC Role / Device Role / Timing Role: Host controller managing K-line timing-critical handshaking, buffering CAN messages, and coordinating flash programming sequences. Use Value: 4-clock core delivers deterministic response under ISO 9141-2 timing constraints; watchdog timer prevents hang during ECU reprogramming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS80C323-QND+ | Lower max clock (18MHz), wider VCC range (2.7V–5.5V), identical pinout and feature set | Better suited for battery-powered or mixed-voltage systems where 33MHz speed is unnecessary | Select DS80C323-QND+ only if operating voltage flexibility or reduced power at lower frequencies is required |
| AT89C51RD2-RLTUM | On-chip 64kB Flash, single UART, 12-clock core, 40-pin PDIP/TQFP-no dual DPTR or MOVX stretch | Lacks extended temperature grade and advanced timing features; suitable for cost-sensitive, non-industrial designs | Choose AT89C51RD2-RLTUM only for new designs where integrated Flash eliminates external ROM and industrial temp is not needed |
Compared with DS80C323-QND+, DS80C320-QNL+ delivers 83% higher instruction throughput at 33MHz but requires stable 5V supply; compared with AT89C51RD2-RLTUM, it trades integrated Flash for deterministic timing control and industrial temperature resilience-making it optimal for upgrade paths where legacy 8051 code and robustness are paramount.
Availability
DS80C320-QNL+ is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, and smart metering applications 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) designs precision analog, mixed-signal, and high-reliability microcontrollers for demanding industrial, medical, and automotive applications.
The DS80C320-QNL+ belongs to Maxim's high-speed 8051-compatible microcontroller family, engineered specifically to extend the life of legacy 8051-based systems with enhanced performance, power monitoring, and memory interface flexibility-without requiring PCB redesign.
FAQ
What is the maximum crystal frequency supported by DS80C320-QNL+?
The DS80C320-QNL+ supports a maximum crystal frequency of 33MHz, enabling an apparent instruction execution rate of approximately 82.5MHz due to its 4-clock-per-cycle architecture. This specification is validated for the –40°C to +85°C temperature range and requires stable 4.25V–5.5V VCC. Operation above 33MHz is not guaranteed and may result in timing violations or functional failure.
Does DS80C320-QNL+ include on-chip program memory?
No, DS80C320-QNL+ does not include on-chip program memory. It is a ROMless variant requiring external program memory (e.g., EPROM or Flash) connected via the multiplexed P0 address/data bus and P2 upper address lines. The EA pin must be tied low to enable external program fetches. This design preserves pin compatibility with standard 80C32 while enabling flexible memory sizing and field-upgradable firmware.
How does the dual data pointer in DS80C320-QNL+ improve performance?
The dual data pointer (DPTR0 at 82h/83h and DPTR1 at 84h/85h) in DS80C320-QNL+ eliminates the need to save and restore address registers during block memory moves. By toggling the DPS bit (SFR 86h), software switches between pointers in one cycle-reducing a 64-byte RAM-to-RAM transfer from 1869 to 1097 machine cycles at 25MHz. This 41% reduction directly accelerates data-intensive tasks like display buffering or protocol packet assembly.
Can DS80C320-QNL+ operate with a 3.3V supply?
No, DS80C320-QNL+ requires a minimum VCC of 4.25V and maximum of 5.5V. It is not rated for 3.3V operation. For 3.3V-compatible 8051 derivatives, consider the DS80C323-QND+, which supports 2.7V–5.5V operation but has a lower 18MHz maximum clock frequency. Using DS80C320-QNL+ below 4.25V risks undefined behavior, including incorrect reset assertion and timing violations.
What is the function of the N.C. pins on DS80C320-QNL+?
The N.C. pins (Pins 12, 34, 6, 28, 39) on DS80C320-QNL+ are no-connect terminals reserved for future devices in the DS80C32x family. They must remain unconnected in all designs-neither tied to VCC, GND, nor left floating-as per Maxim's datasheet guidance. Connecting these pins may cause unpredictable behavior or damage, and their presence reflects package compatibility across variants rather than unused I/O capability.
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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