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Analog Devices Inc./Maxim Integrated DS80C320-MNL+
- Part No.:
- DS80C320-MNL+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
DS80C320-MNL+.pdf
- Description:
- IC MCU 8BIT ROMLESS 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,322
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Product details
Overview
DS80C320-MNL+ 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 4.25V to 5.5V and targets industrial control upgrades requiring deterministic real-time performance in legacy 5V 8051 systems.
For engineers reviewing the DS80C320-MNL+ datasheet, DS80C320-MNL+ pinout, DS80C320-MNL+ application, or DS80C320-MNL+ equivalent, key selection considerations include its -40°C to +85°C extended temperature rating, 40-pin PDIP package, dual DPTR support for accelerated memory moves, stretchable MOVX timing for mixed-speed peripheral interfacing, and power-fail reset/interrupt capability.
Technical Context
The DS80C320-MNL+ implements a redesigned 8051 core executing most instructions in 4 oscillator cycles (vs. 12 in standard 80C32), delivering ~2.5× average speedup without code changes. Its timer subsystem defaults to 12-cycle mode for backward compatibility but supports 4-cycle operation via CKCON register bits.
It integrates two independent full-duplex UARTs-Serial Port 0 (P3.0/P3.1) and Serial Port 1 (P1.2/P1.3)-with separate SFRs (SCON0/SCON1, SBUF0/SBUF1). Memory access uses multiplexed P0 (AD0–AD7) and P2 (A8–A15), with MOVX timing configurable from 2 to 9 machine cycles via CKCON.2–0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C32-compatible 8-bit CPU with 4-clock machine cycle; enables drop-in speed upgrade of legacy 8051 firmware. |
| Max Clock Frequency | 33MHz crystal input; yields apparent execution speed up to 82.5MHz (2.5× standard 80C32 at same crystal). |
| On-Chip RAM | 256 bytes scratchpad RAM; sufficient for stack and local variables without external SRAM in many embedded control tasks. |
| Memory Addressing | 64kB program space (ROM/Flash) and 64kB data space (RAM/peripherals); accessed via P0/P2 bus with ALE strobe. |
| Serial Interfaces | Two independent UARTs; SP0 uses P3.0/RXD0 and P3.1/TXD0; SP1 uses P1.2/RXD1 and P1.3/TXD1; both support identical modes and baud rate generation. |
| Operating Voltage | 4.25V to 5.5V; ensures compatibility with existing 5V logic families and industrial power rails. |
| Temperature Range | -40°C to +85°C; qualified for extended-temperature industrial and automotive under-hood applications. |
| Package | 40-pin plastic DIP (PDIP); provides through-hole mounting for prototyping, legacy board replacement, and high-reliability manual assembly. |
Pinout & Package
DS80C320-MNL+ is housed in a 40-pin plastic dual in-line package (PDIP) with 0.6-inch body width and 0.1-inch pin pitch. Pin functions follow standard 80C32 layout with enhancements including dedicated P1.2/P1.3 for Serial Port 1 and P1.4–P1.7 for additional external interrupts (INT2–INT5).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 40) | Power supply | +5V main supply; internal voltage regulator not present-requires clean, regulated 4.25–5.5V source. |
| GND (Pin 20) | Digital ground reference | Primary return path for all digital I/O and core logic; must be low-impedance connection to system ground plane. |
| RST (Pin 9) | Active-high reset input | Schmitt-triggered input with internal pulldown; accepts external RC or pushbutton reset; no external capacitor required for power-on reset. |
| XTAL1 (Pin 19), XTAL2 (Pin 18) | Clock oscillator interface | Supports parallel-resonant AT-cut crystals up to 33MHz; XTAL1 accepts external clock signal if crystal omitted. |
| P0.0–P0.7 (Pins 39–32) | Multiplexed address/data bus | AD0–AD7 during ALE high; bidirectional data bus during ALE low; requires external latch (e.g., 74LS373) for address capture. |
| P1.0–P1.7 (Pins 1–8) | General-purpose I/O with alternate functions | Includes T2/T2EX (Timer2), RXD1/TXD1 (Serial Port 1), and INT2–INT5 (five additional interrupts); weak pullups active on reset. |
| P2.0–P2.7 (Pins 21–28) | Upper address bus (A8–A15) | Outputs MSB address during external memory access; value latched internally for MOVX @Ri operations; not directly software-controllable as GPIO during memory cycles. |
| P3.0–P3.7 (Pins 10–17) | Multiplexed I/O with standard 8051 peripherals | Provides RXD0/TXD0, INT0/INT1, T0/T1, WR/RD; retains full 80C32 compatibility for legacy designs. |
| EA (Pin 31) | External access enable | Must be tied LOW to disable internal ROM and force all program fetches from external memory; no internal mask ROM present. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointers (DPTR0/DPTR1) | Reduces 64-byte block memory move cycles from 1869 to 1097 at 25MHz-saves 123.5μs-by eliminating address reload overhead between source/destination. |
| Configurable MOVX Timing (CKCON.2–0) | Stretches external data memory read/write strobes from 2 to 9 machine cycles (80–1120ns at 25MHz), enabling direct interface to slow peripherals like LCDs or legacy SRAM without glue logic. |
| Programmable Watchdog Timer | Independent timeout circuit with software-selectable intervals; prevents system lockup in unattended industrial controllers without requiring external IC. |
| Early Warning Power-Fail Interrupt | Generates interrupt before VCC drops below reset threshold, allowing safe state save or controlled shutdown-critical for data integrity in metering or logging applications. |
| Second Hardware UART (Serial Port 1) | Full-duplex UART on P1.2/P1.3 with dedicated SFRs (SCON1/SBUF1); enables simultaneous host communication and fieldbus interface (e.g., Modbus RTU + RS-485 diagnostics) without bit-banging. |
Applications
| Industrial PLC I/O Module | Smart Energy Meter |
|---|---|
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 HMI and master polling, and servicing 13 interrupt sources including fast edge-triggered inputs. Use Value: 33MHz operation ensures sub-millisecond scan times; dual DPTR accelerates analog data buffering; power-fail interrupt preserves last valid sensor readings during brownout. | Use Scenario: Revenue-grade electricity meter with tamper detection, time-of-use billing, and optical/RS-485 communication interfaces. IC Role / Device Role / Timing Role: System-on-chip managing metrology ADC interface, EEPROM data logging, dual serial ports (IRDA + RS-485), and secure cryptographic operations via software routines. Use Value: Extended -40°C to +85°C rating ensures outdoor cabinet reliability; programmable watchdog prevents firmware hang during EMI events; early warning power-fail interrupt triggers EEPROM commit before VCC collapse. |
| Legacy Medical Device Upgrade | Automotive Body Control Module |
Use Scenario: Retrofit of aging infusion pump controller requiring FDA-compliant deterministic response and fail-safe behavior. IC Role / Device Role / Timing Role: Safety-critical MCU running certified control loop, driving stepper motor via GPIO, and communicating with nurse station via isolated UART. Use Value: Pin-compatible 80C32 replacement allows reuse of PCB and firmware base; power-fail reset guarantees immediate motor stop on supply loss; dual UART enables concurrent diagnostic port and CAN gateway interface. | Use Scenario: Under-hood junction box managing lighting, wiper, and HVAC loads with LIN/UART diagnostics. IC Role / Device Role / Timing Role: Central controller interfacing with analog sensors (temp, voltage), driving high-side switches, and supporting bootloader updates over UART. Use Value: 40-pin DIP simplifies rework on existing production boards; 33MHz core handles PWM generation and LIN protocol timing; stretchable MOVX accommodates slow automotive-grade EEPROM writes. |
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 rated for 0°C to +70°C and offered in identical 40-pin PDIP; lacks extended temperature qualification. | Suitable for commercial-grade equipment where ambient temperature stays within 0–70°C; not qualified for industrial enclosures or automotive under-hood use. | Select DS80C320-MCL+ only when cost sensitivity outweighs need for extended temperature operation and long-term supply stability in harsh environments. |
| DS80C323-MNL+ | Identical pinout and feature set, but operates from 2.7V to 5.5V and max 18MHz; lower power consumption at reduced speed. | Preferred for battery-powered or low-voltage industrial sensors where 33MHz speed is unnecessary and supply headroom is constrained. | Choose DS80C323-MNL+ when system voltage may dip below 4.25V or when thermal/power budget limits clock speed-no firmware changes needed beyond timing calibration. |
Compared with DS80C320-MCL+, DS80C320-MNL+ provides guaranteed operation down to -40°C for industrial reliability; compared with DS80C323-MNL+, it delivers 83% higher throughput at 33MHz while maintaining identical code compatibility and peripheral configuration-making it optimal for performance-critical upgrades of legacy 5V systems.
Availability
DS80C320-MNL+ is available at Aetrix Electronics and suitable for industrial PLC modules, smart energy meters, legacy medical device retrofits, and automotive body control units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DS80C320-MNL+ 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 automotive markets.
The DS80C320-MNL+ belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to enable drop-in performance upgrades of legacy 5V embedded systems while preserving software investment and PCB layout.
FAQ
What is the maximum crystal frequency supported by DS80C320-MNL+?
The DS80C320-MNL+ supports a maximum crystal frequency of 33MHz, enabling an apparent instruction execution rate of up to 82.5MHz due to its 4-clock-per-machine-cycle architecture. This specification is validated across the full -40°C to +85°C operating range and is documented in the official Maxim Integrated ordering information table for the DS80C320-MNL+ variant.
Does DS80C320-MNL+ include on-chip program memory (ROM/Flash)?
No, the DS80C320-MNL+ does not contain on-chip program memory. It is a ROMless microcontroller requiring external program memory (e.g., EPROM or Flash) connected via the P0/P2 multiplexed bus. The EA pin (Pin 31) must be tied LOW to enable external program fetches, consistent with the 80C32 architecture it emulates.
How does the dual data pointer (DPTR0/DPTR1) improve performance in DS80C320-MNL+?
The dual data pointer in DS80C320-MNL+ reduces 64-byte memory block move execution time from 1869 to 1097 machine cycles at 25MHz-a 41% reduction-by eliminating repeated address reloads. Software toggles the DPS bit (SFR 86h) to switch between DPTR0 (82h/83h) and DPTR1 (84h/85h), enabling efficient source/destination addressing in tight loops without register spillage.
Can DS80C320-MNL+ operate with a 3.3V supply?
No, DS80C320-MNL+ requires a minimum supply voltage of 4.25V and is specified for operation from 4.25V to 5.5V only. For 3.3V operation, the pin-compatible DS80C323-MNL+ variant should be used-it supports 2.7V to 5.5V and shares identical peripherals, instruction set, and package but is limited to 18MHz maximum clock frequency.
What is the function of the Early Warning Power-Fail Interrupt in DS80C320-MNL+?
The Early Warning Power-Fail Interrupt in DS80C320-MNL+ asserts before VCC drops to the reset threshold, providing software with deterministic time (typically >1ms at 33MHz) to execute critical actions-such as saving volatile state to nonvolatile memory or initiating controlled shutdown-thereby preventing data corruption during brownout conditions in industrial and metering applications.
DS80C320-MNL+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
DS80C320-MNL+ FAQ
1.How can I place an order for DS80C320-MNL+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C320-MNL+ 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-MNL+ reliable?
The price and inventory of DS80C320-MNL+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C320-MNL+ is usually 5 days.
3.What payment methods are accepted for DS80C320-MNL+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C320-MNL+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C320-MNL+?
DS80C320-MNL+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C320-MNL+ 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-MNL+?
For technical support, including DS80C320-MNL+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C320-MNL+ requirements.
6.How does Aetrix verify that DS80C320-MNL+ is sourced from the original manufacturer or authorized distributors?
All DS80C320-MNL+ 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-MNL+ meets industry standards.
7.What is the process for return or replacement of DS80C320-MNL+?
All DS80C320-MNL+ units undergo pre-shipment inspection (PSI). If there is an issue with DS80C320-MNL+, 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-MNL+ part is unused and in its original packaging.
Return procedure for DS80C320-MNL+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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