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Analog Devices Inc./Maxim Integrated DS80C320-QCL+
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- Part No.:
- DS80C320-QCL+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS80C320-QCL+.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:132
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Product details
Overview
DS80C320-QCL+ from Maxim Integrated is a high-speed, 80C32-compatible 8-bit microcontroller featuring a 4-clock-per-machine-cycle core, 33MHz maximum crystal frequency, 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 and targets legacy 8051-based industrial control, instrumentation, and embedded communication systems requiring performance uplift without architectural overhaul.
For engineers reviewing the DS80C320-QCL+ datasheet, DS80C320-QCL+ pinout, DS80C320-QCL+ application, or DS80C320-QCL+ equivalent, key selection considerations include its 4-clock execution architecture, programmable MOVX memory access stretch (2–9 cycles), dual data pointer for accelerated block moves, power-fail reset/interrupt, and watchdog timer - all while maintaining pin and instruction-set compatibility with standard 80C32 designs in 44-pin PLCC.
Technical Context
The DS80C320-QCL+ implements a redesigned 8051 core eliminating wasted clock and memory cycles, delivering 2.5× average instruction speed improvement over the original 80C32 at identical crystal frequencies. Its dual-data-pointer architecture (DPTR0 at 82h/83h, DPTR1 at 84h/85h, selected via DPS bit at 86h) enables single-instruction pointer switching during memory block transfers.
Timing behavior is configurable: timers default to 12-clock-per-cycle operation for backward compatibility but can be reprogrammed to 4-clock mode via CKCON register bits (CKCON.3–5); MOVX access timing is user-adjustable (2–9 machine cycles) using CKCON.2–0, enabling seamless interfacing with 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 (vs. 12-clock in legacy 80C32) |
| Max Clock Frequency | 33MHz crystal input - enables up to 82.5MHz apparent instruction throughput (2.5× speedup) |
| On-Chip RAM | 256 bytes scratchpad RAM - directly addressable as internal data space, no external bus overhead |
| Timer/Counters | Three 16-bit timers/counters - Timer 2 supports capture/reload; all support 4- or 12-clock-per-cycle modes |
| Serial Interfaces | Two independent full-duplex UARTs - Serial Port 0 (P3.0/P3.1) and Serial Port 1 (P1.2/P1.3), each with dedicated SFRs |
| Interrupt Sources | 13 total interrupts - six external (INT0–INT5), seven internal (serial, timer, power-fail), with edge-selectable triggers |
| Memory Addressing | 64kB program space (ROM/EPROM) + 64kB external data space (RAM/peripherals) - accessed via P0 (AD0–AD7) and P2 (A8–A15) |
| Supply Voltage | 4.25V to 5.5V - compatible with standard 5V TTL/CMOS logic and legacy 5V system rails |
Pinout & Package
DS80C320-QCL+ is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, pin-compatible with the 80C32 in PLCC form factor. The package supports surface-mount assembly and provides thermal and mechanical reliability for industrial temperature-grade operation (0°C to +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 22, 23) | Power supply input | +5V main supply - powers core, I/O, and peripherals; decoupling required per layout guidelines |
| GND (Pin 10) | Digital ground reference | Common return path for all digital signals - must be low-impedance and separated from analog ground if present |
| RST (Pin 20) | Active-high reset input | Schmitt-triggered input with internal pulldown - accepts external RC or pushbutton reset; no external capacitor needed |
| 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 - latched by ALE; carries lower address byte during ALE high, then bidirectional data during ALE low |
| P1.0–P1.7 (Pins 2–9, 40–44) | General-purpose I/O with alternate functions | Includes T2/T2EX, RXD1/TXD1, and INT2–INT5 - enables dual serial comms and expanded interrupt handling |
| P2.0–P2.7 (Pins 24–31) | Upper address bus (A8–A15) | Provides MSB for external memory addressing - automatically driven during MOVX/MOVC; software-accessible only for MOVX @Ri |
| P3.0–P3.7 (Pins 11, 13–19) | Multifunction I/O port | Hosts RXD0/TXD0, INT0/INT1, T0/T1, WR/RD - essential for external memory read/write strobes and primary serial interface |
| EA (Pin 35) | External access enable | Must be tied LOW to execute code exclusively from external ROM - no internal program memory |
| ALE (Pin 20) | Address latch enable | Drives external latch (e.g., 74LS373) on rising edge - pulse width = 1.5 XTAL1 cycles, period = 4 XTAL1 cycles |
| PSEN (Pin 32) | Program store enable | Active-low chip enable for external ROM - pulse width = 2.25 XTAL1 cycles, asserted during opcode fetch |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte memory block move from 1869 to 1097 machine cycles - eliminates address save/restore overhead in firmware |
| Configurable MOVX Timing (CKCON.2–0) | Adjusts external data memory access from 2 to 9 machine cycles - supports mixed-speed peripherals (e.g., fast SRAM + slow UART) without glue logic |
| Power-Fail Detection & Reset | Generates early-warning interrupt before brownout and automatic hardware reset - prevents corrupted writes during supply collapse |
| Programmable Watchdog Timer | Independent timeout circuit with software-controllable period - recovers hung firmware without external components |
| Second Hardware UART (Serial Port 1) | Full-duplex interface on P1.2/P1.3 with dedicated SCON1/SBUF1 registers - enables simultaneous host/debug and device-to-device communication |
| 13-Source Interrupt Controller | Supports prioritized, edge-selectable external interrupts (INT2–INT5) plus serial/timer/power-fail events - reduces polling overhead in real-time tasks |
Applications
| Industrial PLC I/O Module | Legacy Equipment Retrofit |
|---|---|
|
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 executing ladder logic scan, managing dual UARTs for Modbus RTU master/slave, and servicing 6+ external interrupts from safety interlocks. Use Value: 2.5× faster scan cycle vs. 80C32 enables higher I/O density and tighter control loop timing within same PCB footprint and firmware base. |
Use Scenario: Upgrading aging test equipment (e.g., bench power supplies, signal generators) originally built around 80C32 without redesigning PCB or rewriting core application code. IC Role / Device Role / Timing Role: Drop-in replacement MCU preserving pinout, instruction set, and memory map - leverages existing schematics and firmware with only minor timing adjustments. Use Value: Achieves measurable performance uplift (e.g., faster waveform generation, quicker calibration routines) while minimizing NRE, validation effort, and supply-chain risk. |
| Multi-Protocol Communication Gateway | Embedded Data Logger |
|
Use Scenario: Aggregating sensor data from CAN, RS-232, and RS-485 networks into a unified Ethernet or cellular uplink. IC Role / Device Role / Timing Role: Central protocol translator running concurrent UART stacks (Port 0 for host PC, Port 1 for fieldbus), managing buffer management via dual DPTR, and handling time-stamped interrupts. Use Value: Dual UARTs eliminate need for external UART expanders; configurable MOVX timing simplifies integration of diverse legacy fieldbus peripherals. |
Use Scenario: Battery-powered environmental monitor recording temperature, humidity, and voltage at fixed intervals, storing logs in external SPI FRAM or SD card. IC Role / Device Role / Timing Role: Low-power controller using power-fail interrupt to flush pending data before shutdown, watchdog timer to recover from flash write errors, and precise timer-based sampling intervals. Use Value: Power-fail detection ensures data integrity during unexpected AC loss; 4-clock core reduces active time per sample, extending battery life. |
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-MCL+ | Same core and features, but in 40-pin PDIP package - lacks P1.2–P1.7 alternate functions (no Serial Port 1 or INT2–INT5) | Targeted at space-constrained through-hole designs where second UART and extra interrupts are unnecessary | Select DS80C320-MCL+ only if PLCC assembly is unavailable and secondary serial port is not required. |
| DS80C323-QCD+ | Identical feature set but rated for 2.7V–5.5V operation and 18MHz max clock - lower power, reduced speed, wider VDD range | Suitable for battery-powered or mixed-voltage systems where 33MHz performance is excessive and supply headroom is limited | Choose DS80C323-QCD+ when operating below 4.25V or when thermal/power constraints preclude 33MHz operation. |
Compared with DS80C320-MCL+, the DS80C320-QCL+ delivers full peripheral complement including Serial Port 1 and five additional interrupts in PLCC packaging; compared with DS80C323-QCD+, it provides 33MHz speed and 4.25–5.5V operation optimized for high-performance 5V industrial upgrades.
Availability
DS80C320-QCL+ is available at Aetrix Electronics and suitable for industrial control, legacy equipment retrofit, multi-protocol gateways, and embedded data loggers requiring stable component supply, long-term manufacturability, and drop-in 80C32 compatibility.
Supply support for DS80C320-QCL+ 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, communications, and computing markets.
The DS80C320-QCL+ belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend the life and capability of legacy 80C32-based systems through architectural acceleration while preserving software and hardware investment.
FAQ
Is DS80C320-QCL+ pin-compatible with standard 80C32 microcontrollers?
Yes, DS80C320-QCL+ is fully pin-compatible with the 80C32 in the 44-pin PLCC package. All signal names, pin positions, and electrical characteristics align - including P0–P3 I/O, RST, XTAL1/XTAL2, ALE, PSEN, EA, VCC, and GND. This allows direct replacement in existing 80C32 PLCC designs without PCB modification.
What is the default MOVX memory access timing for DS80C320-QCL+ after reset?
After reset, DS80C320-QCL+ configures MOVX access to use three machine cycles (a "Stretch" value of 1, per CKCON.2–0 = 001b). This corresponds to a 4-clock-per-cycle core executing MOVX in 12 oscillator cycles at 25MHz - providing compatibility with common 120ns/150ns SRAM without requiring faster memory or timing adjustments.
How does the dual data pointer in DS80C320-QCL+ improve firmware efficiency?
The DS80C320-QCL+ implements two independent 16-bit data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h), selected via the DPS bit at 86h. This allows firmware to hold source and destination addresses simultaneously - reducing a 64-byte block move from 1869 to 1097 machine cycles by eliminating repeated address reloads and saves.
Does DS80C320-QCL+ include on-chip program memory?
No, DS80C320-QCL+ contains no on-chip ROM or EPROM. It executes code exclusively from external program memory (e.g., parallel NOR Flash or EPROM) accessed via P0 and P2 address/data buses. The EA pin must be tied LOW to enable external program fetch, and PSEN provides the active-low chip enable signal.
Can DS80C320-QCL+ operate with a 3.3V supply?
No, DS80C320-QCL+ requires a minimum supply voltage of 4.25V and is specified for operation from 4.25V to 5.5V only. For 3.3V-compatible operation, consider the DS80C323-QCD+, which supports 2.7V–5.5V and shares identical peripheral functionality but is limited to 18MHz maximum clock frequency.
DS80C320-QCL+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 80C
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
DS80C320-QCL+ FAQ
1.How can I place an order for DS80C320-QCL+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C320-QCL+ 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-QCL+ reliable?
The price and inventory of DS80C320-QCL+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C320-QCL+ is usually 5 days.
3.What payment methods are accepted for DS80C320-QCL+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C320-QCL+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C320-QCL+?
DS80C320-QCL+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C320-QCL+ 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-QCL+?
For technical support, including DS80C320-QCL+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C320-QCL+ requirements.
6.How does Aetrix verify that DS80C320-QCL+ is sourced from the original manufacturer or authorized distributors?
All DS80C320-QCL+ 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-QCL+ meets industry standards.
7.What is the process for return or replacement of DS80C320-QCL+?
All DS80C320-QCL+ units undergo pre-shipment inspection (PSI). If there is an issue with DS80C320-QCL+, 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-QCL+ part is unused and in its original packaging.
Return procedure for DS80C320-QCL+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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