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Analog Devices Inc./Maxim Integrated DS80C320-QNL/T&R
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- Part No.:
- DS80C320-QNL/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS80C320-QNL/T&R.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,417
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Product details
Overview
DS80C320-QNL/T&R 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 –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/T&R datasheet, DS80C320-QNL/T&R pinout, DS80C320-QNL/T&R application, or DS80C320-QNL/T&R equivalent, key selection considerations include its 4-clock core timing compatibility mode, stretchable MOVX memory access (2–9 cycle), dual data pointer acceleration, power-fail reset/interrupt, and PLCC-44 package footprint for drop-in replacement in space-constrained 80C32 designs.
Technical Context
The DS80C320-QNL/T&R implements a redesigned 8051 core eliminating dummy clock cycles, executing 159 opcodes at 3× speed versus standard 80C32 while retaining full instruction set and SFR compatibility. Its dual serial ports (UART0 on P3.0/P3.1, UART1 on P1.2/P1.3) operate independently with separate SCON/SBUF registers and shared Timer 1 for baud rate generation.
Timing behavior is configurable via CKCON (SFR 8Eh): default 12-clock timer operation preserves legacy timing, while 4-clock mode enables higher-resolution timing; MOVX stretch (CKCON.2–0) adjusts RD/WR strobe width from 2 to 9 machine cycles to interface with slow peripherals 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 (vs. 12-clock legacy), enabling 2.5× average speedup over same crystal. |
| Max Clock Frequency | 33MHz crystal input, yielding 82.5MHz apparent instruction throughput - supports high-bandwidth serial and real-time control loops. |
| On-Chip RAM | 256 bytes scratchpad RAM - sufficient for stack and register banking without external SRAM for basic firmware. |
| Serial Interfaces | Two independent full-duplex UARTs - enables simultaneous host communication and peripheral bridging (e.g., Modbus RTU + sensor telemetry). |
| Memory Addressing | 64kB program space (ROM/Flash) + 64kB data space (RAM/peripherals) - supports large firmware images and memory-mapped I/O expansion. |
| Operating Voltage | 4.25V to 5.5V - ensures compatibility with legacy 5V TTL logic and industrial power rails without level-shifting. |
| Temperature Range | –40°C to +85°C - qualified for extended-temperature industrial environments including factory automation and outdoor metering. |
Pinout & Package
DS80C320-QNL/T&R is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, compatible with standard PLCC-44 sockets and reflow profiles. Pin 1 is marked by a notch or dot; leads are arranged in counter-clockwise order starting from the index corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 22, 23) | Power supply | +5V main supply rail; decoupling required within 10mm of pins to maintain noise immunity at 33MHz operation. |
| GND (Pin 10) | Digital ground | Primary reference for all digital I/O and internal logic; must be connected to low-impedance system ground plane. |
| RST (Pin 20) | Reset input | Active-high Schmitt-trigger input with internal pulldown; accepts RC or pushbutton reset without external components. |
| XTAL1 (Pin 21), XTAL2 (Pin 22) | Clock oscillator interface | Supports parallel-resonant AT-cut crystals up to 33MHz; XTAL1 accepts external clock source if crystal omitted. |
| P0.0–P0.7 (Pins 32–39) | Multiplexed address/data bus | AD0–AD7: bidirectional bus latched by ALE; requires external latch (e.g., 74LS373) for external memory interfacing. |
| P1.0–P1.7 (Pins 2–9, 40–44) | General-purpose I/O with alternate functions | Includes UART1 (P1.2/RXD1, P1.3/TXD1), Timer2 I/O (P1.0/T2, P1.1/T2EX), and five external interrupts (INT2–INT5). |
| P2.0–P2.7 (Pins 24–31) | High-order address bus | A8–A15: outputs MSB address during external memory access; value reflects internal latch, not pin state during read/write. |
| P3.0–P3.7 (Pins 11, 13–19, 5, 7–13) | Multi-function I/O port | Provides UART0 (P3.0/RXD0, P3.1/TXD0), INT0/INT1, T0/T1, WR (P3.6), RD (P3.7) - essential for memory-mapped peripheral control. |
| EA (Pin 35) | External access enable | Must be tied LOW to disable internal ROM and force all program fetches from external memory - required for DS80C320 operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte block memory moves from 1869 to 1097 machine cycles - cuts firmware overhead by 41% and eliminates address save/restore instructions. |
| Configurable MOVX Timing (CKCON.2–0) | Adjusts RD/WR strobe width from 2 to 9 machine cycles - enables direct interface with 120ns–1120ns access-time memories and slow peripherals like LCD controllers. |
| Power-Fail Detection & Reset | Generates early-warning interrupt before brownout and hard reset on VCC drop - allows safe EEPROM save and controlled shutdown in utility meters. |
| Programmable Watchdog Timer | Independent timeout circuit with software-selectable period - prevents runaway code in unattended systems like remote telemetry nodes. |
| Second Hardware UART (UART1) | Dedicated serial port on P1.2/P1.3 with full SCON1/SBUF1 register set - enables concurrent host diagnostics and fieldbus communication without CPU polling. |
Applications
| Industrial PLC I/O Module | Legacy 8051 System Upgrade |
|---|---|
|
Use Scenario: Compact programmable logic controller module handling analog input scanning, digital output control, and Modbus RTU communication over RS-485. IC Role / Device Role / Timing Role: Primary controller executing cyclic scan logic, managing dual UARTs for HMI and fieldbus, and servicing 13 interrupt sources for fast edge-triggered inputs. Use Value: 2.5× speedup enables 10ms scan cycles vs. 25ms on legacy 80C32 - meets IEC 61131-3 real-time requirements without FPGA co-processing. |
Use Scenario: Retrofit of aging medical device firmware where PCB layout and BOM must remain unchanged but processing headroom is exhausted. IC Role / Device Role / Timing Role: Drop-in replacement for 80C32 in 44-pin PLCC socket, leveraging identical pinout and SFR map while accelerating existing assembly/C code. Use Value: No PCB or firmware rewrite needed; default 12-clock timer mode preserves original baud rates and PWM timing - only MOVX timing requires minor tuning. |
| Smart Energy Meter MCU | Embedded Test Instrument Controller |
|
Use Scenario: Electricity meter performing metrology calculations, tamper detection, secure data logging, and DLMS/COSEM protocol over PLC or RF mesh. IC Role / Device Role / Timing Role: Real-time controller with power-fail interrupt for last-gasp EEPROM write, watchdog for firmware integrity, and dual UARTs for debug and communication ICs. Use Value: Power-fail reset guarantees nonvolatile storage of critical billing data during grid instability - meets ANSI C12.1 and IEC 62056 compliance requirements. |
Use Scenario: Benchtop test instrument coordinating multiple sensors (thermocouple, pressure), driving display, and communicating via USB-to-UART bridge. IC Role / Device Role / Timing Role: Central sequencer managing time-critical ADC sampling, SPI/I²C peripheral control, and asynchronous serial command parsing. Use Value: Dual DPTR accelerates calibration coefficient table lookups; stretchable MOVX interfaces directly with slow 100kHz SPI DACs without wait-state logic. |
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-QCL+ | Same core, 33MHz, –40°C to +85°C, but in 44-pin TQFP package - no leaded PLCC footprint. | Preferred for new designs using surface-mount assembly and tighter board space; lacks PLCC socket compatibility. | Select DS80C320-QCL+ only when migrating from through-hole to fine-pitch SMT and redesigning PCB layout. |
| DS80C323-QND+ | Identical feature set but 18MHz max clock and 2.7V–5.5V operation - lower power, reduced speed. | Suitable for battery-powered or mixed-voltage systems where 33MHz is unnecessary and voltage flexibility is critical. | Choose DS80C323-QND+ when extending battery life in portable instruments or interfacing with 3.3V peripherals without level shifters. |
Compared with DS80C320-QNL/T&R, DS80C320-QCL+ offers identical performance in a smaller TQFP package but requires PCB redesign, while DS80C323-QND+ trades speed and voltage range for ultra-low-power operation - neither is pin-compatible without mechanical or electrical adaptation.
Availability
DS80C320-QNL/T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, and embedded instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DS80C320-QNL/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 communications applications.
The DS80C320-QNL/T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend the life of legacy 80C32-based systems while delivering measurable performance gains without architectural disruption.
FAQ
What is the maximum crystal frequency supported by DS80C320-QNL/T&R?
The DS80C320-QNL/T&R supports a maximum crystal frequency of 33MHz, enabling an apparent instruction execution rate of 82.5MHz due to its 4-clock-per-machine-cycle architecture. This specification is validated across the full –40°C to +85°C operating temperature range and is documented in Maxim's official ordering information table for the QNL variant.
Does DS80C320-QNL/T&R require external pull-up resistors on Port 0?
Yes, DS80C320-QNL/T&R requires external pull-up resistors on Port 0 (P0.0–P0.7) because it lacks internal port latches and functions as a true open-drain multiplexed address/data bus. Without pull-ups, signals will float during ALE low periods, causing unreliable external memory reads/writes - typical designs use 4.7kΩ resistors to VCC.
How does the dual data pointer in DS80C320-QNL/T&R improve firmware efficiency?
The dual data pointer (DPTR0 at 82h/83h, DPTR1 at 84h/85h) in DS80C320-QNL/T&R reduces 64-byte memory block moves from 1869 to 1097 machine cycles by eliminating address save/restore instructions. Switching between pointers via DPS bit (SFR 86h) enables single-instruction context switching - directly accelerating data logging, buffer management, and DMA-like operations in firmware.
Can DS80C320-QNL/T&R operate with a 3.3V supply?
No, DS80C320-QNL/T&R is specified for 4.25V to 5.5V operation only. For 3.3V compatibility, the pin-compatible DS80C323-QND+ variant should be used - it shares identical features and PLCC-44 packaging but supports 2.7V–5.5V operation and has a 18MHz maximum clock rating.
What is the function of the EA pin on DS80C320-QNL/T&R, and how must it be connected?
The EA (External Access) pin on DS80C320-QNL/T&R must be permanently tied LOW to disable internal ROM and force all program fetches from external memory - this is mandatory because the DS80C320 contains no on-chip ROM. Leaving EA floating or HIGH will cause undefined boot behavior and failure to execute code from external Flash or EPROM.
DS80C320-QNL/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:
- 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/T&R FAQ
1.How can I place an order for DS80C320-QNL/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C320-QNL/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-QNL/T&R reliable?
The price and inventory of DS80C320-QNL/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-QNL/T&R is usually 5 days.
3.What payment methods are accepted for DS80C320-QNL/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C320-QNL/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C320-QNL/T&R?
DS80C320-QNL/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C320-QNL/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-QNL/T&R?
For technical support, including DS80C320-QNL/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C320-QNL/T&R requirements.
6.How does Aetrix verify that DS80C320-QNL/T&R is sourced from the original manufacturer or authorized distributors?
All DS80C320-QNL/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-QNL/T&R meets industry standards.
7.What is the process for return or replacement of DS80C320-QNL/T&R?
All DS80C320-QNL/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS80C320-QNL/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-QNL/T&R part is unused and in its original packaging.
Return procedure for DS80C320-QNL/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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