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Analog Devices Inc./Maxim Integrated DS89C440-MNG
- Part No.:
- DS89C440-MNG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
DS89C440-MNG.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,887
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Product details
Overview
DS89C440-MNG from Maxim Integrated is a discontinued 32 kB flash, 8051-compatible ultra-high-speed microcontroller executing instructions at up to 12× the speed of legacy 8051 cores at the same crystal frequency, delivering 33 MIPS at 33 MHz, with dual data pointers, two full-duplex serial ports, and power-fail reset - used in industrial control and white goods where deterministic real-time response and in-system programmability are required.
For engineers reviewing the DS89C440-MNG datasheet, DS89C440-MNG pinout, DS89C440-MNG application, or DS89C440-MNG equivalent, this page delivers verified technical context, validated pin functions, confirmed replacement guidance, and supply-chain support for legacy design continuity and drop-in migration paths.
Technical Context
The DS89C440-MNG implements a one-clock-per-machine-cycle 8051 core with DC–33 MHz operation, enabling single-cycle instruction execution in 30 ns at maximum clock rate. It supports four paged memory-access modes and optional variable-length MOVX timing via MD2:MD0 bits to interface with slow peripherals.
Its architecture includes dual data pointers with automatic increment/decrement and toggle select, ROMSIZE feature for dynamic internal program memory size selection (0–64 kB), and hardware power management with programmable clock divider and automatic exit from idle/stop modes on interrupt.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | One-clock-per-cycle 8051-compatible CPU, not 12-clock legacy cycle - enables 33 MIPS at 33 MHz. |
| Flash Memory | 32 kB on-chip flash, in-application and in-system programmable via serial port or parallel programming. |
| RAM | 1 kB SRAM accessible via MOVX, plus 256 bytes of standard 8051 scratchpad RAM. |
| Operating Voltage | 4.5 V to 5.5 V - supports industrial-grade voltage tolerance with power-fail warning at 4.2–4.6 V. |
| Temperature Range | -40°C to +85°C ambient - qualified for HVAC, building automation, and industrial embedded use. |
| Interrupt System | 13 interrupt sources (6 external), five priority levels, and early-warning power-fail interrupt. |
| Serial Interfaces | Two independent full-duplex UARTs (Serial Port 0 and Serial Port 1), supporting synchronous mode with selectable clock dividers. |
Pinout & Package
DS89C440-MNG is packaged in a 44-pin PLCC (Plastic Leaded Chip Carrier) with 1.27 mm pitch, lead-free/RoHS-compliant construction, and thermal pad omitted - suitable for through-hole reflow or socketed industrial control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 (AD0–AD7) | Multiplexed address/data bus / I/O | Open-drain port; latches LSB of external address during ALE high, transitions to bidirectional data bus on ALE low - requires pullups when used as GPIO. |
| P1.0–P1.7 | General-purpose I/O / alternate functions | Includes T2/T2EX, RXD1/TXD1, and INT2–INT5 - strong pulldown on write-0, weak pullup on reset or write-1. |
| P2.0–P2.7 (A8–A15) | MSB address bus / I/O | Provides upper address byte for external memory access; in Page Mode 1, supplies both MSB and LSB; in Page Mode 2, supplies MSB and data. |
| P3.0–P3.7 | General-purpose I/O / critical system signals | Includes RXD0/TXD0, INT0/INT1, T0/T1, WR, RD - WR and RD serve as strobes for external data memory read/write cycles. |
| RST | Bidirectional reset input | Internal Schmitt trigger and 50–200 kΩ pulldown enable wire-OR reset sources; no external RC required due to internal power-on reset circuitry. |
| XTAL1/XTAL2 | Clock oscillator interface | Supports fundamental-mode AT-cut crystals (1–33 MHz); XTAL1 accepts external clock source; XTAL2 is amplifier output. |
| EA | External access control | High = execute from internal flash; low = fetch code from external memory - enables hybrid memory mapping. |
| ALE/PROG | Address latch enable / programming mode | Drives external latch (e.g., 74LS373) on falling edge; pulse width configurable per page mode; PROG function enables parallel flash programming. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-high-speed core | Executes all instructions in one clock cycle - eliminates wasted cycles of legacy 8051, enabling true 33 MIPS at 33 MHz. |
| Dual data pointers | DPTR and DPTR1 with auto-increment/decrement and toggle select accelerate block memory transfers without software overhead. |
| Variable MOVX timing | MD2:MD0 bits add up to 9 extra machine cycles to MOVX - ensures reliable interfacing with slow SRAM, EEPROM, or peripherals. |
| Power-fail detection | Hardware VPFW comparator triggers early-warning interrupt at 4.2–4.6 V, allowing safe state save before brownout reset at 3.95–4.35 V. |
| EMI reduction mode | Disables ALE during idle periods - reduces radiated emissions in noise-sensitive building automation and medical equipment. |
| ROMSIZE configurability | Software-selectable internal program memory size (0–64 kB) - enables identical firmware across DS89C430/440/450 variants. |
Applications
| Industrial Motor Control | Building Energy Management |
|---|---|
Use Scenario: Closed-loop motor speed regulation using PWM outputs and quadrature encoder feedback in HVAC blowers and pumps. IC Role / Device Role / Timing Role: Real-time execution of PID loops at sub-millisecond intervals using timer interrupts and fast I/O toggling. Use Value: 30 ns instruction latency and dual DPTRs reduce loop overhead by >40% versus legacy 8051, enabling tighter control bandwidth. |
Use Scenario: Distributed sensor aggregation and relay control in commercial lighting and HVAC zone controllers. IC Role / Device Role / Timing Role: Dual UARTs handle Modbus RTU communication with field devices while local I/O manages occupancy sensors and damper actuators. Use Value: In-system flash programming allows over-the-air firmware updates without hardware rework or factory reflashing. |
| Uninterruptible Power Supplies (UPS) | White Goods Control Panels |
Use Scenario: Battery monitoring, AC/DC conversion sequencing, and failover logic in line-interactive UPS units. IC Role / Device Role / Timing Role: Power-fail interrupt triggers immediate state capture into flash before shutdown; watchdog ensures recovery from transient faults. Use Value: Hardware VPFW and VRST thresholds (4.2–4.6 V / 3.95–4.35 V) provide precise brownout margin for clean shutdown at 5 V ±10% rails. |
Use Scenario: Main controller for washing machines and dishwashers managing pump drivers, temperature sensing, and user interface. IC Role / Device Role / Timing Role: Four 8-bit I/O ports directly drive relays and optocouplers; serial ports interface with display modules and EEPROM parameter storage. Use Value: 32 kB flash accommodates multi-language UI, calibration tables, and fault-log history without external memory expansion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8051-compatible microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS89C450-MNG | 64 kB flash (vs. 32 kB), otherwise identical pinout, timing, and peripheral set - direct drop-in replacement per Maxim documentation. | Supports larger firmware images and bootloader+application partitioning; no change to PCB or driver layer. | Select when future firmware growth or secure boot requirements demand additional flash space. |
| DS89C430-MNG | 16 kB flash (vs. 32 kB), same package and core - fully compatible with DS89C440-MNG software and hardware except memory map size. | Suitable for cost-optimized designs where firmware fits in 16 kB; requires ROMSIZE register configuration to limit visible flash. | Choose for legacy BOM rationalization where existing DS89C430 toolchains and test fixtures are already deployed. |
Compared with DS89C440-MNG, DS89C450-MNG offers double flash capacity with zero hardware changes, while DS89C430-MNG provides a lower-cost path with verified compatibility but requires firmware size validation and ROMSIZE setup.
Availability
DS89C440-MNG is available at Aetrix Electronics and suitable for industrial motor control, building energy management, uninterruptible power supplies, and white goods requiring stable component supply amid end-of-life transitions.
Supply support for DS89C440-MNG 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability microcontrollers for industrial and embedded systems.
The DS89C440-MNG belongs to Maxim's Ultra-High-Speed Flash Microcontroller family, designed specifically to replace legacy 8051-based systems with minimal firmware changes while delivering 10× performance uplift in space-constrained industrial controls.
FAQ
Is DS89C440-MNG still in production?
No, DS89C440-MNG is discontinued by Maxim Integrated. However, Aetrix Electronics maintains active inventory and offers long-term supply support, including traceable lots and engineering assistance for migration to DS89C450-MNG or DS89C430-MNG as documented in the official datasheet.
What is the correct replacement for DS89C440-MNG?
The DS89C450-MNG is the officially designated drop-in replacement for DS89C440-MNG, offering identical pinout, timing, and peripherals with increased 64 kB flash. DS89C430-MNG is also compatible but requires firmware size verification and ROMSIZE register configuration to match the 32 kB memory map.
Does DS89C440-MNG support in-system programming?
Yes, DS89C440-MNG supports in-system programming via its primary serial port (P3.0/P3.1) using the built-in ROM-resident bootloader. No external programmer is needed - firmware updates can be performed in the field using standard UART commands and protocol defined in the Ultra-High-Speed Flash Microcontroller User's Guide.
What package type is DS89C440-MNG supplied in?
DS89C440-MNG is supplied in a 44-pin PLCC (Plastic Leaded Chip Carrier) package with 1.27 mm lead pitch and RoHS-compliant lead-free finish. Pinout matches DS89C430-QNL and DS89C450-QNL variants, enabling socket compatibility across the family.
Can DS89C440-MNG operate at 5.5 V supply?
Yes, DS89C440-MNG is fully specified for operation from 4.5 V to 5.5 V. Its DC electrical characteristics - including reset trip point (3.95–4.35 V), power-fail warning (4.2–4.6 V), and I/O voltage levels - are guaranteed across this full range, making it suitable for noisy industrial 5 V rails with ±10% tolerance.
DS89C440-MNG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Series:
- 89C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 25MHz
- 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-MNG FAQ
1.How can I place an order for DS89C440-MNG through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C440-MNG 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-MNG reliable?
The price and inventory of DS89C440-MNG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C440-MNG is usually 5 days.
3.What payment methods are accepted for DS89C440-MNG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C440-MNG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C440-MNG?
DS89C440-MNG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C440-MNG 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-MNG?
For technical support, including DS89C440-MNG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C440-MNG requirements.
6.How does Aetrix verify that DS89C440-MNG is sourced from the original manufacturer or authorized distributors?
All DS89C440-MNG 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-MNG meets industry standards.
7.What is the process for return or replacement of DS89C440-MNG?
All DS89C440-MNG units undergo pre-shipment inspection (PSI). If there is an issue with DS89C440-MNG, 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-MNG part is unused and in its original packaging.
Return procedure for DS89C440-MNG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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