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Analog Devices Inc./Maxim Integrated DS89C440-MNL+
- Part No.:
- DS89C440-MNL+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
DS89C440-MNL+.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:412
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Product details
Overview
DS89C440-MNL+ from Maxim Integrated (now Analog Devices) is a discontinued 32kB Flash, 8051-compatible ultra-high-speed microcontroller in 40-pin PDIP package, executing instructions up to 12× faster than legacy 8051 at same crystal frequency, delivering 33 MIPS at 33MHz, and used in industrial control, HVAC, and power management systems requiring deterministic real-time response.
For engineers reviewing the DS89C440-MNL+ datasheet, DS89C440-MNL+ pinout, DS89C440-MNL+ application, or DS89C440-MNL+ equivalent, this page provides verified technical context, validated pin functions, confirmed replacement guidance, and precise timing/flash/power specifications directly traceable to Maxim's official DS89C430/DS89C450 documentation.
Technical Context
The DS89C440-MNL+ implements a one-clock-per-machine-cycle 8051 core with DC–33MHz operation, enabling single-cycle instruction execution in 30ns at maximum clock rate. It supports four paged memory-access modes and optional variable-length MOVX for flexible external peripheral interfacing.
It integrates dual data pointers with automatic increment/decrement and toggle select, 1kB SRAM for MOVX operations, programmable clock divider for power management, and ROMSIZE feature enabling dynamic internal program memory size selection from 0 to 64kB - though DS89C440-MNL+ is fixed at 32kB Flash per ordering information.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | One-clock-per-cycle 8051-compatible CPU, eliminating wasted cycles of legacy 8051; enables 12× speedup for most instructions at same crystal frequency. |
| Max Clock Frequency | 33MHz system clock - achieves 33 MIPS performance; supports external crystal (1–33MHz) or external clock source. |
| Flash Memory | 32kB on-chip Flash - in-application programmable via serial port; 10,000 write/erase cycles; 100-year data retention. |
| RAM | 1kB dedicated MOVX RAM + 256B scratchpad RAM - enables high-bandwidth external memory access without contention. |
| Operating Voltage | 4.5V to 5.5V - compatible with standard 5V industrial logic; includes power-fail warning (VPFW = 4.2–4.6V) and reset trip point (VRST = 3.95–4.35V). |
| Power Modes | Active (75–110mA), Idle (40–50mA), Stop with bandgap disabled (1–100µA) - programmable clock divider supports 1× to 1024× slowdown for low-power operation. |
| I/O & Peripherals | Four 8-bit bidirectional ports (P0–P3), two full-duplex UARTs, three 16-bit timers, 13 interrupt sources with five priority levels, programmable watchdog timer. |
Pinout & Package
DS89C440-MNL+ uses a 40-pin Plastic Dual In-line Package (PDIP) with 0.6-inch body width and 0.1-inch pin pitch. Pin functions are identical to DS89C430-MNL+ and DS89C450-MNL+ per Maxim's pin compatibility guarantee across the family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 40) | Supply voltage input | +5V nominal supply; device operates over 4.5V–5.5V range with brownout detection and power-fail interrupt capability. |
| GND (Pin 20) | Logic ground reference | Primary return path for all digital and analog circuitry; must be low-impedance connection to minimize noise coupling. |
| RST (Pin 9) | Reset input/output | Bidirectional Schmitt-triggered pin with internal 50–200kΩ pulldown; accepts active-high external reset; no external RC required due to internal POR circuit. |
| XTAL1 (Pin 19), XTAL2 (Pin 18) | Clock oscillator interface | Supports fundamental-mode AT-cut crystals (1–33MHz); XTAL1 accepts external clock source; internal oscillator drives core and peripherals synchronously. |
| P0.0–P0.7 (Pins 39–32) | Multiplexed address/data bus | Open-drain port; outputs LSB address during ALE high, transitions to bidirectional data bus when ALE falls; requires pullups for I/O use. |
| P2.0–P2.7 (Pins 21–28) | MSB address bus / I/O | Provides upper address bits (A8–A15) during external memory access; functions as general-purpose I/O otherwise; weak pullup on reset. |
| P3.6 (WR), P3.7 (RD) | External memory strobes | Active-low signals controlling write and read cycles to external RAM/peripherals; timing fully specified for MOVX instruction variants. |
| EA (Pin 31) | External access control | High = execute from internal Flash; low = force external program memory fetch; internal RAM remains accessible regardless of EA state. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointers (DPTR/DPTR1) | Enables zero-overhead block memory moves; automatic increment/decrement and toggle select eliminate software pointer management overhead. |
| Variable-Length MOVX Timing | MD2:MD0 bits configure MOVX access time from 2–9 machine cycles - allows reliable interfacing with slow peripherals without CPU polling or wait states. |
| EMI Reduction Mode | Disables ALE during idle periods - reduces radiated emissions in sensitive environments like building automation and medical equipment. |
| Programmable Clock Divider | Slows CPU from 1× to 1024× system clock - extends battery life in portable industrial sensors while preserving interrupt latency via auto-switchback. |
| Early Warning Power-Fail Interrupt | Triggers interrupt at VPFW (4.2–4.6V) before VRST (3.95–4.35V) - enables safe data save, state preservation, and controlled shutdown in UPS and energy metering. |
Applications
| Industrial Control and Automation | HVAC System Controllers |
|---|---|
Use Scenario: Real-time monitoring and actuation of motors, valves, and sensors in PLC-based factory lines. IC Role / Device Role / Timing Role: Primary controller executing deterministic ladder logic and PID loops with sub-100µs interrupt latency. Use Value: 33 MIPS throughput and dual UARTs enable concurrent Modbus RTU communication and local I/O scanning without timing jitter. |
Use Scenario: Embedded thermostat and chiller control unit managing temperature setpoints, fan speeds, and refrigerant pressure feedback. IC Role / Device Role / Timing Role: Central MCU coordinating sensor reads (ADC via external interface), PWM fan control, and RS-485 network reporting. Use Value: 32kB Flash stores multi-zone firmware and calibration tables; power-fail interrupt ensures EEPROM-safe parameter backup during grid dips. |
| Uninterruptible Power Supplies (UPS) | Building Energy Management Systems |
Use Scenario: Battery-backed AC/DC conversion control with line monitoring, battery charge/discharge management, and alarm signaling. IC Role / Device Role / Timing Role: Core supervisor handling analog sensing, relay control, and serial telemetry to master BMS controller. Use Value: Early-warning power-fail interrupt (VPFW) triggers immediate switchover to battery; 1kB MOVX RAM buffers critical status logs during outage. |
Use Scenario: Distributed node collecting lighting, occupancy, and HVAC zone data for centralized cloud analytics and demand-response optimization. IC Role / Device Role / Timing Role: Edge node MCU aggregating sensor inputs, performing local decision logic, and transmitting via RS-485 or CAN (via external transceiver). Use Value: Dual UARTs support simultaneous Modbus slave and gateway protocol translation; 32kB Flash accommodates field-upgradable security and encryption routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8051-compatible microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS89C430-MNL+ | 16kB Flash (vs. 32kB), otherwise identical pinout, timing, and peripheral set; same 40-pin PDIP package and RoHS-compliant marking. | Suitable where firmware footprint fits within 16kB; retains full compatibility for legacy designs scaling down memory requirements. | Select DS89C430-MNL+ only if code size permits - avoids redesign but sacrifices headroom for future feature expansion. |
| DS89C450-MNL+ | 64kB Flash (vs. 32kB), identical architecture, package, and electrical specs; drop-in replacement per Maxim's ordering guide. | Required for larger firmware images including bootloader, OTA update stack, or cryptographic libraries. | DS89C450-MNL+ is the recommended direct upgrade path - preserves PCB layout and firmware structure while doubling Flash capacity. |
Compared with DS89C440-MNL+, DS89C430-MNL+ offers reduced Flash for cost-sensitive deployments, while DS89C450-MNL+ delivers scalable headroom for complex embedded applications - both maintain identical timing, power behavior, and peripheral register mapping.
Availability
DS89C440-MNL+ is available at Aetrix Electronics and suitable for industrial control, HVAC, and uninterruptible power supply applications requiring stable component supply and long-term design continuity.
Supply support for DS89C440-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 (acquired by Analog Devices in 2021) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and microcontroller solutions for industrial, automotive, and communications markets.
The DS89C440-MNL+ belongs to Maxim's Ultra-High-Speed Flash Microcontroller product line, designed specifically to replace legacy 8051-based systems with deterministic real-time performance, enhanced power efficiency, and robust in-system programmability.
FAQ
Is DS89C440-MNL+ still in production?
No, DS89C440-MNL+ is discontinued per Maxim's ordering information, which states "DS89C440-xxx Contact factory or replace with DS89C430 or DS89C450." Aetrix Electronics maintains legacy inventory and supports design continuity through verified drop-in alternatives including DS89C450-MNL+.
What is the correct replacement for DS89C440-MNL+?
The DS89C450-MNL+ is the officially designated drop-in replacement for DS89C440-MNL+, offering identical 40-pin PDIP packaging, pinout, timing, and peripheral functionality - with increased 64kB Flash capacity. DS89C430-MNL+ (16kB) is also compatible but reduces memory headroom.
Does DS89C440-MNL+ support in-system programming (ISP)?
Yes, DS89C440-MNL+ supports in-system programming through its serial port using ROM-resident or user-defined loader software. Flash programming requires VCC = 4.5–5.5V, and specifications confirm 10,000 write/erase cycles with 100-year data retention.
What are the power supply requirements for DS89C440-MNL+?
DS89C440-MNL+ operates from 4.5V to 5.5V DC. It features a power-fail warning threshold (VPFW = 4.2–4.6V) and reset trip point (VRST = 3.95–4.35V), enabling early-warning interrupts and controlled shutdown. Supply current ranges from 1–100µA in Stop mode to 110mA in Active mode at 33MHz.
Can DS89C440-MNL+ interface with external memory?
Yes, DS89C440-MNL+ supports external program and data memory via multiplexed P0 (AD0–AD7) and P2 (A8–A15), with dedicated RD/P3.7 and WR/P3.6 strobes. MOVX timing is configurable from 2–9 machine cycles using MD2:MD0 bits, enabling reliable interfacing with slow SRAM, EEPROM, or peripherals.
DS89C440-MNL+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Series:
- 89C
- Packaging:
- Bulk
- 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:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K 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:
DS89C440-MNL+ FAQ
1.How can I place an order for DS89C440-MNL+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C440-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 DS89C440-MNL+ reliable?
The price and inventory of DS89C440-MNL+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C440-MNL+ is usually 5 days.
3.What payment methods are accepted for DS89C440-MNL+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C440-MNL+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C440-MNL+?
DS89C440-MNL+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C440-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 DS89C440-MNL+?
For technical support, including DS89C440-MNL+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C440-MNL+ requirements.
6.How does Aetrix verify that DS89C440-MNL+ is sourced from the original manufacturer or authorized distributors?
All DS89C440-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 DS89C440-MNL+ meets industry standards.
7.What is the process for return or replacement of DS89C440-MNL+?
All DS89C440-MNL+ units undergo pre-shipment inspection (PSI). If there is an issue with DS89C440-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 DS89C440-MNL+ part is unused and in its original packaging.
Return procedure for DS89C440-MNL+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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