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Analog Devices Inc./Maxim Integrated DS80C320-MCL+
- Part No.:
- DS80C320-MCL+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
DS80C320-MCL+.pdf
- Description:
- IC MCU 8BIT ROMLESS 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,591
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Product details
Overview
DS80C320-MCL+ 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 serves as a drop-in performance upgrade in industrial control, embedded instrumentation, and legacy 5V 8051-based systems requiring deterministic real-time response.
For engineers reviewing the DS80C320-MCL+ datasheet, DS80C320-MCL+ pinout, DS80C320-MCL+ application, or DS80C320-MCL+ equivalent, key selection criteria include its 33MHz operation at 4.25–5.5V, dual DPTR support for accelerated memory moves, variable MOVX stretch timing (2–9 cycles), power-fail reset/interrupt capability, and full pin compatibility with standard 80C32 in 40-pin DIP packaging.
Technical Context
The DS80C320-MCL+ implements a redesigned 8051 core eliminating wasted clock and memory cycles, delivering 2.5× average instruction speedup over the original 80C32 at identical crystal frequencies. Its 4-clock machine cycle enables single-cycle instructions in 121ns at 33MHz, while retaining full 8051 instruction set compatibility and defaulting timers to 12-clock mode for backward timing compatibility.
It integrates two independent full-duplex UARTs (Serial Port 0 on P3.0/P3.1, Serial Port 1 on P1.2/P1.3), seven external interrupt sources (INT2–INT5 added beyond standard INT0/INT1), and configurable memory access via CKCON register (SFR 8Eh) to adjust MOVX strobe width from 2 to 9 machine cycles for mixed-speed peripheral interfacing.
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 - enables 82.5MHz apparent instruction throughput |
| Operating Voltage | 4.25V to 5.5V - direct replacement in existing +5V systems without level shifting |
| On-Chip RAM | 256 bytes scratchpad RAM - accessible without wait states; no external RAM required for basic operation |
| Memory Addressing | 64kB program space (ROM) and 64kB data space (RAM/peripherals) - supports large legacy firmware images |
| Serial Interfaces | Two independent full-duplex UARTs - enables simultaneous host communication and peripheral bridging |
| Interrupt Sources | 13 total interrupts including six external (INT0–INT5) - supports complex real-time event handling |
| Package | 40-pin plastic DIP - direct PCB footprint compatibility with legacy 80C32 designs |
Pinout & Package
DS80C320-MCL+ is housed in a 40-pin plastic DIP package with 0.6-inch width, compatible with standard through-hole prototyping and industrial PCB layouts. Pin assignments follow industry-standard 80C32 mapping with enhanced functionality on Port 1 and dedicated control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 40) | Power Supply | +5V supply input - operates across full 4.25–5.5V range for robust noise margin |
| GND (Pin 20) | Digital Ground | Reference return path for all digital logic - must be low-impedance connection to system ground plane |
| RST (Pin 9) | Reset Input | Active-high Schmitt-trigger input with internal pulldown - accepts RC or pushbutton reset; no external pullup required |
| XTAL1 (Pin 18), XTAL2 (Pin 19) | Clock Interface | Crystal oscillator inputs supporting parallel-resonant AT-cut crystals up to 33MHz; XTAL1 accepts external clock source |
| P0.0–P0.7 (Pins 39–32) | Multiplexed Address/Data Bus | AD0–AD7 - provides lower address byte during ALE high, then bidirectional data bus; requires external latch (e.g., 74LS373) for memory interface |
| P1.0–P1.7 (Pins 1–8) | General I/O with Alternate Functions | Supports T2/T2EX, RXD1/TXD1, and INT2–INT5 - enables second UART and five additional edge-triggered interrupts |
| P2.0–P2.7 (Pins 21–28) | High-Order Address Bus | A8–A15 - supplies upper address byte for external memory mapping; value latched internally during MOVX operations |
| P3.0–P3.7 (Pins 10–17) | Multifunction I/O Port | Provides RXD0/TXD0, INT0/INT1, T0/T1, WR/RD - maintains full 80C32 serial, timer, and memory control compatibility |
| EA (Pin 31) | External Access Enable | Active-low input - must be tied to GND to enable external program memory access (no internal ROM) |
| ALE (Pin 30) | Address Latch Enable | Output pulse (1.5 XTAL1 cycles wide) - synchronizes external address latching on falling edge of ALE |
| PSEN (Pin 29) | Program Store Enable | Active-low ROM chip select - generates 2.25-cycle pulse every 4 XTAL1 cycles during code fetch from external memory |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointers (DPTR0/DPTR1) | Reduces 64-byte block memory move cycles from 1869 to 1097 at 25MHz - eliminates address save/restore overhead in firmware |
| Variable MOVX Timing (CKCON) | Configurable 2–9 machine-cycle data access - enables seamless interfacing to both fast SRAM and slow peripherals (e.g., LCD, UART) without glue logic |
| Power-Fail Detection & Reset | Hardware-generated reset and early-warning interrupt on VCC droop - ensures safe state capture before brownout shutdown |
| Programmable Watchdog Timer | Independent timeout circuit with software-controlled enable/disable - prevents runaway code in unattended embedded systems |
| Second Hardware UART (Serial Port 1) | Full-duplex asynchronous interface on P1.2/P1.3 - supports concurrent diagnostics logging and fieldbus communication without software bit-banging |
Applications
| Industrial PLC I/O Module | Legacy Medical Instrument Upgrade |
|---|---|
Use Scenario: Real-time monitoring and control of analog/digital sensors and actuators in factory automation cabinets with RS-485 fieldbus connectivity. IC Role / Device Role / Timing Role: Primary controller executing deterministic ladder logic scans, managing dual UARTs for HMI and Modbus RTU, and servicing 13 interrupt sources for emergency stop and limit switch events. Use Value: 33MHz operation delivers sub-millisecond scan times; power-fail interrupt preserves last valid sensor readings before shutdown; dual DPTR accelerates calibration data transfers to external EEPROM. | Use Scenario: Retrofitting aging ECG or patient monitor platforms originally based on 80C32 to extend product life while meeting updated safety and data logging requirements. IC Role / Device Role / Timing Role: System-on-chip replacing obsolete 80C32 - handles analog front-end digitization, real-time waveform display buffering, SD card logging, and USB-to-serial bridge via second UART. Use Value: Pin-for-pin DIP compatibility avoids PCB redesign; 4-clock core enables faster FFT processing for arrhythmia detection; programmable watchdog ensures fail-safe behavior during firmware updates. |
| Smart Energy Meter Communication Hub | Automated Test Equipment (ATE) Controller |
Use Scenario: Aggregating consumption data from multiple meters via PLC or RF mesh, then forwarding to utility head-end via GPRS or Ethernet using external modem interface. IC Role / Device Role / Timing Role: Central protocol translator and scheduler - manages time-synchronized meter polling via first UART, processes DLMS/COSEM frames, and drives modem via second UART with hardware flow control. Use Value: Variable MOVX timing allows direct interfacing to both fast SPI flash (2-cycle) and slow GPRS modem registers (7-cycle); early-warning power-fail interrupt triggers secure data commit before capacitor discharge. | Use Scenario: Controlling precision signal generators, DMMs, and switching matrices in benchtop ATE systems requiring tight synchronization between stimulus and measurement. IC Role / Device Role / Timing Role: Real-time sequencer coordinating GPIB/LXI instrument commands, sampling trigger generation, and pass/fail result aggregation via dual UARTs and timer-captured timestamps. Use Value: Dual hardware UARTs eliminate software UART timing jitter; 33MHz clock enables <100ns timer resolution for stimulus alignment; 13 interrupt sources handle concurrent instrument status events without polling overhead. |
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-MCG+ | Same core and features but rated for 25MHz max clock and 0°C to +70°C temperature range | Suitable for cost-sensitive, non-speed-critical industrial controls where 33MHz headroom is unnecessary | Select DS80C320-MCG+ when thermal budget or crystal availability limits maximum frequency to 25MHz |
| DS80C323-MCD+ | Identical feature set with 2.7–5.5V operation and 18MHz max clock - optimized for battery-powered or mixed-voltage systems | Required for portable medical devices or remote sensors operating below 4.25V where DS80C320-MCL+ cannot function | Choose DS80C323-MCD+ only when supply voltage drops below 4.25V or ultra-low-power sleep modes are mandatory |
Compared with DS80C320-MCL+, DS80C320-MCG+ trades 33MHz speed for lower cost and same package, while DS80C323-MCD+ sacrifices clock speed and voltage margin to enable sub-4.25V operation - neither offers pin-compatible 33MHz performance in a 40-pin DIP at 5V.
Availability
DS80C320-MCL+ is available at Aetrix Electronics and suitable for industrial control, medical device retrofit, and smart metering applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant through-hole packaging.
Supply support for DS80C320-MCL+ 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 solutions for industrial, communications, and computing markets.
The DS80C320-MCL+ belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend the life of legacy 5V embedded systems by delivering 2.5× performance without requiring software or hardware redesign.
FAQ
What is the maximum crystal frequency supported by DS80C320-MCL+?
The DS80C320-MCL+ supports a maximum crystal frequency of 33MHz, enabling single-cycle instructions to execute in 121ns. This rating applies under the specified 0°C to +70°C ambient temperature range and 4.25–5.5V supply voltage. Operation above 33MHz is not guaranteed and may violate timing specifications for internal peripherals such as timers and serial ports.
Does DS80C320-MCL+ include on-chip program memory?
No, the DS80C320-MCL+ does not contain on-chip ROM or Flash memory. It is a ROMless variant that executes code from external program memory accessed via the multiplexed P0 address/data bus and P2 high-order address lines. The EA pin must be tied low to enable external program memory access, consistent with standard 80C32 behavior.
How does the dual data pointer (DPTR) in DS80C320-MCL+ improve firmware efficiency?
The DS80C320-MCL+ implements two independent 16-bit data pointers (DPTR0 at SFR 82h/83h and DPTR1 at 84h/85h), selected via DPS bit (SFR 86h). This eliminates the need to save and restore address registers during memory block moves - for example, a 64-byte transfer requires 1097 machine cycles instead of 1869, saving 123.5μs at 25MHz. The DS80C320-MCL+ firmware uses INC DPS to toggle pointers within tight loops.
Can DS80C320-MCL+ operate with a 3.3V supply?
No, the DS80C320-MCL+ is specified for 4.25V to 5.5V operation only. Applying 3.3V will result in undefined behavior, failed resets, or inability to drive TTL-compatible outputs. For 3.3V systems, consider the pin-compatible DS80C323-MCD+, which supports 2.7–5.5V operation but is limited to 18MHz maximum clock frequency.
What is the purpose of the CKCON register in DS80C320-MCL+?
The CKCON register (SFR 8Eh) in DS80C320-MCL+ controls two critical timing functions: bits CKCON.2–0 configure MOVX instruction stretch timing (2–9 machine cycles) for flexible peripheral interfacing, while CKCON.3–5 independently set timer/counters 0–2 to run at either 4-clock or 12-clock per cycle. On reset, MOVX defaults to 3-cycle mode and timers to 12-cycle mode for backward compatibility with legacy 80C32 code.
DS80C320-MCL+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
DS80C320-MCL+ FAQ
1.How can I place an order for DS80C320-MCL+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C320-MCL+ 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-MCL+ reliable?
The price and inventory of DS80C320-MCL+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C320-MCL+ is usually 5 days.
3.What payment methods are accepted for DS80C320-MCL+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C320-MCL+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C320-MCL+?
DS80C320-MCL+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C320-MCL+ 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-MCL+?
For technical support, including DS80C320-MCL+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C320-MCL+ requirements.
6.How does Aetrix verify that DS80C320-MCL+ is sourced from the original manufacturer or authorized distributors?
All DS80C320-MCL+ 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-MCL+ meets industry standards.
7.What is the process for return or replacement of DS80C320-MCL+?
All DS80C320-MCL+ units undergo pre-shipment inspection (PSI). If there is an issue with DS80C320-MCL+, 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-MCL+ part is unused and in its original packaging.
Return procedure for DS80C320-MCL+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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