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Analog Devices Inc./Maxim Integrated DS80C320-QNG+
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- Part No.:
- DS80C320-QNG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS80C320-QNG+.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
DS80C320-QNG+ from Maxim Integrated is a high-speed, 80C32-compatible 8-bit microcontroller with 4-clock-per-machine-cycle architecture, 256 bytes of on-chip RAM, three 16-bit timer/counters, and dual full-duplex hardware serial ports. It operates from 4.25V to 5.5V at up to 25MHz (–40°C to +85°C), targeting industrial control, legacy 8051 system upgrades, and embedded instrumentation requiring deterministic timing and pin compatibility.
For engineers reviewing the DS80C320-QNG+ datasheet, DS80C320-QNG+ pinout, DS80C320-QNG+ application, or DS80C320-QNG+ equivalent, key selection considerations include its 4-clock core speed advantage over standard 80C32, programmable MOVX memory access stretch (2–9 cycles), dual data pointer for accelerated block moves, power-fail reset/interrupt, and watchdog timer - all in a 44-pin PLCC package rated for extended temperature operation.
Technical Context
The DS80C320-QNG+ implements a redesigned 8051-compatible core executing most instructions in 4 oscillator cycles (vs. 12 in legacy 80C32), delivering ~2.5× average speed improvement without code changes. Its dual SFR-mapped data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h) enable zero-overhead switching between source/destination addresses during memory moves.
Peripheral timing is decoupled from CPU speed: timers default to 12-clock mode post-reset for backward baud rate compatibility, but CKCON register bits (8Eh) allow independent 4-clock reconfiguration for Timer 0/1/2. MOVX access timing is software-controlled via CKCON[2:0], supporting mixed-speed memory/peripheral interfaces without external glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C32-compatible 8-bit CPU with 4-clock machine cycle (vs. 12-clock legacy) |
| Max Clock Speed | 25MHz at –40°C to +85°C - enables 62.5MIPS peak instruction throughput |
| On-Chip RAM | 256 bytes scratchpad RAM - accessible as internal data space without wait states |
| Serial Interfaces | Two independent 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 0/1 support standard modes; Timer 2 adds capture/reload |
| Interrupt Sources | 13 total interrupts including six external (INT0–INT5) - supports real-time event handling with priority levels |
| Memory Addressing | 64kB program space (ROM/EPROM) and 64kB data space (RAM/peripherals) - uses P0/P2 multiplexed bus |
| Supply Voltage | 4.25V to 5.5V - ensures compatibility with legacy 5V industrial systems and noise margin |
Pinout & Package
DS80C320-QNG+ 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 extended-temperature environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 22,23) | Power supply input | +5V main supply - powers digital core and I/O; requires local decoupling per datasheet layout guidelines |
| GND (Pin 10) | Digital ground reference | Common return path for all digital signals - must be low-impedance connection to minimize noise coupling |
| RST (Pin 20) | Active-high reset input | Schmitt-triggered input with internal pulldown - accepts external RC or pushbutton reset; no external capacitor required |
| XTAL1 (Pin 21), XTAL2 (Pin 22) | Clock oscillator interface | Supports parallel-resonant AT-cut crystals up to 25MHz or external CMOS clock source at XTAL1 |
| P0.0–P0.7 (Pins 32–39) | Multiplexed address/data bus | AD0–AD7 - latched by ALE; used for ROM reads and RAM reads/writes; no internal latch - requires external pullups |
| P1.0–P1.7 (Pins 2–9) | General-purpose I/O with alternate functions | Includes T2/T2EX, RXD1/TXD1, and INT2–INT5 - enables expanded interrupt handling and second UART without port sharing |
| P2.0–P2.7 (Pins 24–31) | High-order address bus (A8–A15) | Provides MSB for external memory addressing - automatically driven during MOVX accesses; not usable as pure GPIO during memory ops |
| P3.0–P3.7 (Pins 11,13–19) | Multi-function I/O port | Hosts RXD0/TXD0, INT0/INT1, T0/T1, WR/RD - retains full 80C32 compatibility while adding dedicated control strobes |
| EA (Pin 35) | External access enable | Must be tied LOW - forces all program fetches from external ROM; no internal program memory |
| ALE (Pin 20) | Address latch enable | Outputs 1.5-cycle pulse every 4 clocks - synchronizes external latch (e.g., 74LS373) for P0 address demuxing |
| PSEN (Pin 32) | Program store enable | Active-low ROM chip select - pulses at 1/4 crystal frequency with 2.25-cycle width during opcode fetches |
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 reload overhead in firmware |
| Programmable MOVX Stretch (CKCON[2:0]) | Configures off-chip data access from 2 to 9 machine cycles - supports mixed-speed peripherals (e.g., slow LCD + fast SRAM) without glue logic |
| Power-Fail Detection & Reset | Generates early-warning interrupt before brownout and hard reset - enables safe state save and controlled shutdown in industrial power systems |
| Programmable Watchdog Timer | Independent timeout circuit with software-selectable period - prevents system lockup in unattended embedded applications |
| Second Hardware UART (Serial Port 1) | Full-duplex interface on P1.2/P1.3 with dedicated SCON1/SBUF1 registers - enables simultaneous host comms and peripheral bridging |
| Extended Interrupt Capability | Seven additional interrupt sources beyond 80C32 baseline - includes edge-triggered INT2–INT5 for precise event capture in real-time control |
Applications
| Industrial PLC I/O Module | Legacy 8051 System Upgrade |
|---|---|
Use Scenario: Modular programmable logic controller with distributed analog/digital I/O and RS-485 fieldbus communication. IC Role / Device Role / Timing Role: Central controller managing sensor acquisition, PID loop execution, and dual-serial protocol translation (Modbus RTU on Port 0, ASCII on Port 1). Use Value: 25MHz operation delivers deterministic 100μs loop times; dual UARTs eliminate external bridge ICs; power-fail interrupt preserves last valid sensor readings during brownout. | Use Scenario: Retrofit of aging medical device control board originally using 80C32, requiring higher throughput without PCB redesign. IC Role / Device Role / Timing Role: Drop-in replacement executing same firmware at 2.5× speed - accelerates display refresh, keypad scanning, and safety monitoring routines. Use Value: Pin- and instruction-set compatibility avoids layout changes; 4-clock core reduces latency in time-critical safety interlocks; extended temp range supports sterilization cycles. |
| Smart Energy Meter Interface | Test Equipment Embedded Controller |
Use Scenario: Electricity meter with metrology IC interface, tamper detection, and HAN (Home Area Network) communication via Zigbee module. IC Role / Device Role / Timing Role: Host processor coordinating SPI-based metrology data collection, GPIO-based tamper switch polling, and UART-based Zigbee command framing. Use Value: Dual DPTR accelerates calibration coefficient table transfers; programmable MOVX stretch accommodates both fast metrology FIFO and slow Zigbee UART; watchdog ensures recovery from RF interference events. | Use Scenario: Automated test fixture for PCB functional validation, requiring precise timing generation, relay control, and PC communication. IC Role / Device Role / Timing Role: Real-time sequencer generating TTL-level test vectors, reading DUT responses, and reporting results via USB-to-UART bridge. Use Value: 13 interrupt sources handle concurrent trigger inputs and fault conditions; power-fail reset maintains test state integrity during lab power fluctuations; 44-pin PLCC provides robust mechanical mounting for production fixtures. |
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-QNL+ | Same 44-pin PLCC package and –40°C to +85°C rating, but rated for 33MHz max clock (vs. 25MHz) | Enables higher instruction throughput in timing-critical applications where 33MHz crystal and fast external memory are available | Select DS80C320-QNL+ when maximum performance is required and system timing budget allows faster memory access |
| DS80C323-QND+ | Identical pinout and feature set but operates from 2.7V to 5.5V and max 18MHz - lower power, reduced speed | Suitable for battery-powered or mixed-voltage systems where 5V-only operation is not feasible | Choose DS80C323-QND+ for portable instrumentation or energy-harvesting designs needing wider VCC range and lower active current |
Compared with DS80C320-QNG+, DS80C320-QNL+ offers higher clock headroom for performance scaling, while DS80C323-QND+ trades speed for voltage flexibility and power efficiency - both retain identical peripheral sets and software compatibility but serve distinct system-level constraints.
Availability
DS80C320-QNG+ is available at Aetrix Electronics and suitable for industrial automation, legacy system modernization, and embedded instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DS80C320-QNG+ 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 high-performance analog, mixed-signal, and embedded processing solutions for industrial, automotive, and communications markets.
The DS80C320-QNG+ belongs to Maxim's high-speed 8051-compatible microcontroller family, engineered to deliver deterministic real-time performance, robust industrial interfacing, and seamless migration paths for legacy 80C32-based designs.
FAQ
What is the maximum operating frequency of the DS80C320-QNG+?
The DS80C320-QNG+ is rated for a maximum crystal frequency of 25MHz across its specified operating temperature range of –40°C to +85°C. This yields a machine cycle time of 160ns and supports instruction execution speeds up to 6.25 million instructions per second (MIPS) for single-cycle operations. The device achieves this performance through its optimized 4-clock-per-cycle architecture, which is three times faster per instruction than the legacy 80C32 at the same crystal frequency.
Does the DS80C320-QNG+ include on-chip program memory?
No, the DS80C320-QNG+ does not include on-chip program memory. It is a ROMless microcontroller that relies entirely on external program memory accessed via its multiplexed P0 address/data bus and P2 high-order address lines. The EA pin must be tied LOW to enable external program fetches. This design follows the 80C32 architecture and allows flexible selection of EPROM, Flash, or masked ROM based on system requirements and update needs.
How does the dual data pointer in the DS80C320-QNG+ improve firmware efficiency?
The DS80C320-QNG+ implements two independent 16-bit data pointers (DPTR0 at SFR 82h/83h and DPTR1 at 84h/85h), selected via the DPS bit (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 with dual DPTR versus 1869 cycles using a single pointer at 25MHz - a 41% reduction in execution time and direct reduction in code size and interrupt latency.
Can the DS80C320-QNG+ operate with a 3.3V supply?
No, the DS80C320-QNG+ requires a minimum supply voltage of 4.25V and is specified only for operation between 4.25V and 5.5V. It is not compatible with 3.3V logic systems. For 3.3V or wider voltage-range operation, the pin-compatible DS80C323-QND+ variant is available, which supports 2.7V to 5.5V operation but with a reduced maximum clock speed of 18MHz.
What packaging and lead finish does the DS80C320-QNG+ use?
The DS80C320-QNG+ is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry and RoHS-compliant, lead-free (Pb-free) finish. The "+" suffix explicitly denotes compliance with EU RoHS Directive 2011/65/EU. This package supports surface-mount assembly, offers good thermal dissipation for industrial environments, and is rated for operation from –40°C to +85°C.
DS80C320-QNG+ 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:
- 25MHz
- 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-QNG+ FAQ
1.How can I place an order for DS80C320-QNG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C320-QNG+ 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-QNG+ reliable?
The price and inventory of DS80C320-QNG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C320-QNG+ is usually 5 days.
3.What payment methods are accepted for DS80C320-QNG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C320-QNG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C320-QNG+?
DS80C320-QNG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C320-QNG+ 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-QNG+?
For technical support, including DS80C320-QNG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C320-QNG+ requirements.
6.How does Aetrix verify that DS80C320-QNG+ is sourced from the original manufacturer or authorized distributors?
All DS80C320-QNG+ 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-QNG+ meets industry standards.
7.What is the process for return or replacement of DS80C320-QNG+?
All DS80C320-QNG+ units undergo pre-shipment inspection (PSI). If there is an issue with DS80C320-QNG+, 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-QNG+ part is unused and in its original packaging.
Return procedure for DS80C320-QNG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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