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Analog Devices Inc./Maxim Integrated DS80C320-QNG+T&R
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- Part No.:
- DS80C320-QNG+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS80C320-QNG+T&R.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,075
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Product details
Overview
DS80C320-QNG+T&R 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), delivering ~2.5× speed improvement over standard 8051 code in industrial control and legacy system upgrades.
For engineers reviewing the DS80C320-QNG+T&R datasheet, DS80C320-QNG+T&R pinout, DS80C320-QNG+T&R application, or DS80C320-QNG+T&R equivalent, key selection considerations include its PLCC-44 package, programmable MOVX memory stretch (2–9 cycles), dual data pointer for accelerated block moves, power-fail reset/interrupt, and watchdog timer - all while maintaining 8051 instruction set and pin compatibility.
Technical Context
The DS80C320-QNG+T&R implements a redesigned 8051 core eliminating wasted clock and memory cycles, executing most instructions in 4 oscillator cycles versus 12 in legacy 80C32. Its dual-data-pointer architecture (DPTR0 at 82h/83h, DPTR1 at 84h/85h) enables single-instruction switching between source and destination addresses during memory moves.
Peripherals include two independent UARTs (Serial Port 0 on P3.0/P3.1; Serial Port 1 on P1.2/P1.3), seven external interrupts (INT2–INT5 added beyond standard INT0/INT1), and configurable timer speeds via CKCON register (8Eh) - timers default to 12-cycle mode for backward timing compatibility but support 4-cycle operation for higher precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C32-compatible 8-bit CPU with 4-clock machine cycle (vs. 12-clock legacy), enabling ~2.5× average speedup without code rewrite. |
| Max Clock Speed | 25 MHz at –40°C to +85°C operating range - supports real-time deterministic execution in extended-temperature industrial environments. |
| On-Chip RAM | 256 bytes scratchpad RAM - sufficient for stack and local variables; external RAM accessed via MOVX with programmable 2–9 cycle timing. |
| Timer/Counters | Three 16-bit timers/counters (T0, T1, T2) - T2 supports capture/reload; all configurable for 4- or 12-clock increment modes via CKCON. |
| Serial Interfaces | Two independent full-duplex UARTs - SP0 (P3.0/RXD0, P3.1/TXD0) and SP1 (P1.2/RXD1, P1.3/TXD1); SP1 uses Timer 1 only for baud rate generation. |
| Interrupt Sources | 13 total interrupts (6 external: INT0–INT5; 7 internal) - includes early-warning power-fail interrupt and programmable watchdog timeout interrupt. |
| Supply Voltage | 4.25V to 5.5V - compatible with legacy 5V TTL/CMOS systems and tolerant of rail droop during brown-out conditions. |
Pinout & Package
DS80C320-QNG+T&R is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, designed for socketed or surface-mount applications requiring thermal reliability and mechanical robustness in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 22,23) | Power Supply | +5V main supply input; decoupling required near pins to maintain noise immunity during high-speed instruction fetch. |
| GND (Pin 10) | Digital Ground | Reference return path for all digital I/O and core logic; must be low-impedance and separated from analog/power ground if mixed-signal peripherals are used. |
| RST (Pin 20) | Reset Input | Active-high Schmitt-trigger input with internal pulldown; accepts external RC or pushbutton reset; no external capacitor needed for power-on reset. |
| XTAL1 (Pin 21), XTAL2 (Pin 22) | Crystal Oscillator Interface | Supports parallel-resonant AT-cut crystals up to 25MHz; XTAL1 accepts external clock source if crystal omitted. |
| P0.0–P0.7 (Pins 32–39) | Multiplexed Address/Data Bus | AD0–AD7: provides lower 8 bits of address during ALE high, then bidirectional data bus during MOVX; requires external latch (e.g., 74LS373) for external memory interface. |
| P1.0–P1.7 (Pins 2–9, 40–44) | General-Purpose I/O with Alternate Functions | Includes T2/T2EX (P1.0/P1.1), RXD1/TXD1 (P1.2/P1.3), and INT2–INT5 (P1.4–P1.7); weak pullups enable input mode; strong pulldown on write-0. |
| P2.0–P2.7 (Pins 24–31) | Upper Address Bus (A8–A15) | Outputs MSB of 16-bit external address during MOVX/MOVC; value latched internally for indirect addressing - not directly software-controllable as GPIO during memory access. |
| P3.0–P3.7 (Pins 11,13–19,5,7–13) | Multiplexed I/O with Standard 8051 Functions | Provides RXD0/TXD0 (P3.0/P3.1), INT0/INT1 (P3.2/P3.3), T0/T1 (P3.4/P3.5), WR/ RD (P3.6/P3.7); retains full 8051 peripheral mapping for drop-in replacement. |
| EA (Pin 35) | External Access Enable | Must be tied LOW to disable internal ROM and enable external program memory access - required for all DS80C320 configurations since it lacks on-chip ROM. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte memory block move from 1869 to 1097 machine cycles (35% fewer cycles), eliminating address save/restore overhead in firmware. |
| Programmable MOVX Stretch (CKCON.2–0) | Configures external data memory access timing from 2 to 9 machine cycles - enables direct interface to slow peripherals (e.g., LCDs, legacy UARTs) without glue logic. |
| Power-Fail Detection & Reset | Integrated circuit monitors VCC and asserts RST before voltage drops below 4.25V; also generates early-warning interrupt to allow graceful shutdown or state save. |
| Programmable Watchdog Timer | Independent timer with software-selectable timeout period - prevents system lockup due to runaway code or EMI-induced faults in unattended industrial equipment. |
| Second Hardware UART (Serial Port 1) | Full-duplex UART on P1.2/P1.3 with dedicated SCON1/SBUF1 registers - enables simultaneous host communication and fieldbus protocol handling (e.g., Modbus RTU + debug console). |
Applications
| Industrial PLC I/O Module | Legacy 5V Embedded Controller Upgrade |
|---|---|
Use Scenario: Real-time monitoring and control of discrete sensors/actuators in factory automation cabinets with RS-485 fieldbus connectivity. IC Role / Device Role / Timing Role: Primary controller managing dual UARTs (one for Modbus RTU master, one for diagnostics), 16-bit timers for PWM motor control, and power-fail interrupt for nonvolatile state backup. Use Value: 2.5× faster scan cycle vs. legacy 80C32 allows tighter control loop timing while retaining existing PCB layout and firmware structure. |
Use Scenario: Drop-in replacement for aging 80C32-based medical device controllers requiring extended temperature support and enhanced reliability. IC Role / Device Role / Timing Role: Pin- and code-compatible MCU providing identical I/O port behavior, timer functions, and serial interfaces - with added watchdog and power-fail safety features. Use Value: Eliminates redesign effort while adding certified safety mechanisms (IEC 60601-1 fault response) via integrated reset/interrupt logic. |
| Energy Meter Communication Hub | Test Equipment Firmware Engine |
Use Scenario: Aggregating data from multiple metering ICs and relaying via RS-485 or IR optical port in smart electricity meters. IC Role / Device Role / Timing Role: Dual UART coordinator (one for metrology SPI bridge, one for HAN communication), using dual DPTR for rapid buffer-to-buffer transfers between isolated domains. Use Value: MOVX stretch tuning allows seamless interfacing with both fast SPI peripherals and slow IR transceivers on same data bus without timing conflicts. |
Use Scenario: Embedded controller in automated test equipment performing calibration sequence execution, GPIB/Ethernet command parsing, and DAC/ADC sequencing. IC Role / Device Role / Timing Role: High-precision timing engine using Timer 2 capture mode for pulse-width measurement and dual UARTs for instrument control and logging. Use Value: 4-clock core enables sub-microsecond instruction resolution for deterministic stimulus/response timing critical in production test cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8051-compatible microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS80C320-QCL+ | Same PLCC-44 package and feature set, but rated for 33MHz max clock (vs. 25MHz) and 0°C to +70°C temperature range. | Suitable for commercial-grade designs requiring higher throughput where extended temperature is not mandatory. | Select DS80C320-QCL+ only if 33MHz operation is required and ambient temperature stays within 0°C–70°C; otherwise DS80C320-QNG+T&R ensures full industrial temp coverage. |
| AT89C51RD2-RLTUM | Enhanced 8051 with 64kB Flash, 1.25kB RAM, and ISP capability; PLCC-44 package but different pinout (no dual UART, no MOVX stretch, no power-fail detection). | Better for new designs needing in-system programming and larger code space, but requires PCB and firmware adaptation. | Choose AT89C51RD2-RLTUM only for green-field designs prioritizing flash density and reprogrammability over drop-in compatibility and industrial safety features. |
Compared with DS80C320-QCL+, DS80C320-QNG+T&R trades 8MHz clock headroom for guaranteed operation down to –40°C - critical for outdoor or factory-floor deployments. Against AT89C51RD2-RLTUM, DS80C320-QNG+T&R preserves legacy 80C32 pinout and adds hardware safety features absent in the Atmel part, making it superior for retrofit reliability-critical systems.
Availability
DS80C320-QNG+T&R is available at Aetrix Electronics and suitable for industrial control systems, legacy 5V embedded upgrades, energy metering hubs, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DS80C320-QNG+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 high-performance analog, mixed-signal, and embedded processing solutions for industrial, automotive, and communications markets.
The DS80C320-QNG+T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, engineered to deliver deterministic real-time performance and hardware safety features for upgrading legacy 5V control systems without board-level redesign.
FAQ
What is the maximum operating frequency of the DS80C320-QNG+T&R?
The DS80C320-QNG+T&R is rated for a maximum crystal frequency of 25MHz across its full operating temperature range of –40°C to +85°C. This corresponds to an effective instruction throughput of approximately 6.25 million machine cycles per second (25MHz ÷ 4 clocks/cycle), enabling significantly faster execution than standard 80C32 devices while maintaining full 8051 instruction set compatibility.
Does the DS80C320-QNG+T&R include on-chip program memory?
No, the DS80C320-QNG+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 upper address lines. The EA pin must be tied LOW to enable external program fetch, consistent with its 80C32 heritage and target use in systems with field-upgradable firmware stored in EPROM or Flash.
How does the dual data pointer improve firmware efficiency in the DS80C320-QNG+T&R?
The DS80C320-QNG+T&R implements two independent 16-bit data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h) selectable via the DPS bit (86h.0). This eliminates the need to save and restore address registers during memory block transfers - a 64-byte move executes in 1097 machine cycles instead of 1869, reducing latency by 41% and simplifying buffer management in communication stacks and data logging routines.
Can the DS80C320-QNG+T&R operate with a 3.3V supply?
No, the DS80C320-QNG+T&R is specified for 4.25V to 5.5V operation only. For 3.3V-compatible 8051 derivatives, consider the DS80C323 variant (e.g., DS80C323-QND+), which shares the same PLCC-44 package and feature set but supports 2.7V to 5.5V supply - though with a reduced maximum clock speed of 18MHz.
What packaging and reel specifications apply to DS80C320-QNG+T&R?
The DS80C320-QNG+T&R is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with lead-free (RoHS-compliant) finish. "T&R" denotes tape-and-reel packaging: standard reel quantity is 500 units per 24mm-wide embossed plastic tape, compliant with EIA-481-D standards, and suitable for automated SMT placement in high-volume manufacturing.
DS80C320-QNG+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:
- 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+T&R FAQ
1.How can I place an order for DS80C320-QNG+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C320-QNG+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 DS80C320-QNG+T&R reliable?
The price and inventory of DS80C320-QNG+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 DS80C320-QNG+T&R is usually 5 days.
3.What payment methods are accepted for DS80C320-QNG+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C320-QNG+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C320-QNG+T&R?
DS80C320-QNG+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C320-QNG+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 DS80C320-QNG+T&R?
For technical support, including DS80C320-QNG+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C320-QNG+T&R requirements.
6.How does Aetrix verify that DS80C320-QNG+T&R is sourced from the original manufacturer or authorized distributors?
All DS80C320-QNG+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 DS80C320-QNG+T&R meets industry standards.
7.What is the process for return or replacement of DS80C320-QNG+T&R?
All DS80C320-QNG+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS80C320-QNG+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 DS80C320-QNG+T&R part is unused and in its original packaging.
Return procedure for DS80C320-QNG+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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