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Analog Devices Inc./Maxim Integrated DS89C440-QNG
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- Part No.:
- DS89C440-QNG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS89C440-QNG.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,111
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Product details
Overview
DS89C440-QNG from Maxim Integrated is a discontinued 32 kB flash, 8051-compatible ultra-high-speed microcontroller operating up to 33 MHz with 1-cycle-per-instruction execution, delivering ~33 MIPS performance. It features dual data pointers, two full-duplex UARTs, five interrupt priority levels, and power-fail reset - deployed in industrial control, HVAC, and uninterruptible power supplies.
For engineers reviewing the DS89C440-QNG datasheet, DS89C440-QNG pinout, DS89C440-QNG application, or DS89C440-QNG equivalent, this page delivers verified technical context, validated pin functions, confirmed replacement guidance, and supply support for legacy integration and redesign scenarios.
Technical Context
The DS89C440-QNG implements a redesigned 8051 core executing all instructions in one system clock cycle (vs. 12 in legacy 8051), enabling 33 MHz operation and 33 MIPS throughput. It supports variable-length MOVX access (2–9 cycles) via MD2:MD0 bits and includes ROMSIZE register for dynamic internal memory size selection (0–64 kB).
Its power management uses programmable clock divider (1× to 1024×) with automatic hardware/software exit, while EMI reduction disables ALE during idle external memory access. The device integrates 1 kB SRAM for MOVX operations, 13 interrupt sources (6 external), and early-warning power-fail interrupt with VPFW = 4.2–4.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8051-compatible, single-cycle instruction execution at up to 33 MHz |
| Flash Memory | 32 kB - sufficient for medium-complexity firmware with in-application programming capability |
| SRAM | 1 kB dedicated MOVX RAM - enables fast external memory block transfers without internal RAM contention |
| Operating Voltage | 4.5 V to 5.5 V - compatible with standard +5 V industrial logic rails and brownout detection |
| Temperature Range | -40°C to +85°C - qualified for industrial and automotive-adjacent environments |
| Power-Fail Warning | VPFW = 4.2–4.6 V - triggers early warning interrupt before reset threshold VRST = 3.95–4.35 V |
| Interrupt System | 13 sources, 5 priority levels - supports deterministic real-time response in multi-tasking control applications |
Pinout & Package
DS89C440-QNG 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 prototyping and legacy PCB rework.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 22) | Supply voltage input | +5 V main power rail; decoupling required within 10 mm of pin per high-speed operation |
| GND (Pin 23) | Logic ground reference | Common return path for all digital I/O and internal logic; must be low-impedance plane |
| RST (Pin 10) | Active-high reset input/output | Bidirectional with internal 50–200 kΩ pulldown; accepts external RC or supervisor IC without external resistor |
| XTAL1 (Pin 1) | Crystal oscillator input / external clock input | Accepts fundamental-mode AT-cut crystal (1–33 MHz) or CMOS-level clock source |
| XTAL2 (Pin 2) | Crystal oscillator output | Drives crystal in parallel-resonant configuration; not used with external clock mode |
| P0.0–P0.7 (Pins 39–32) | Multiplexed address/data bus (AD0–AD7) | Open-drain outputs requiring pullups when used as I/O; latched on ALE falling edge for external memory access |
| P2.0–P2.7 (Pins 21–28) | High-order address bus (A8–A15) | Provides MSB address during external program/data fetch; supports page modes 1 and 2 |
| P3.6 / WR (Pin 16) | External write strobe | Active-low signal synchronized to ALE; controls timing of MOVX @WR writes to external peripherals or RAM |
| P3.7 / RD (Pin 17) | External read strobe | Active-low signal synchronized to ALE; defines valid window for MOVX @RD data capture from external devices |
| EA (Pin 31) | External access select | High = execute from internal 32 kB flash; low = force external program memory fetch - overrides ROMSIZE setting |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointers (DPTR/DPTR1) | Enables simultaneous block moves between different memory regions without software pointer management overhead |
| Variable-Length MOVX Timing | Configurable 2–9 machine-cycle delays via MD2:MD0 bits - matches timing requirements of slow peripherals without CPU polling |
| ROMSIZE Register | Software-selectable internal program memory size (0–64 kB) - allows same firmware binary to run across DS89C430/440/450 variants |
| EMI Reduction Mode | Disables ALE during idle periods - reduces radiated emissions in noise-sensitive industrial enclosures |
| Power-Fail Early Warning | Dedicated interrupt triggered at VPFW (4.2–4.6 V) - provides ≥100 µs margin before VRST reset assertion for graceful shutdown |
| Programmable Clock Divider | 1× to 1024× division with automatic wake-on-interrupt - cuts active current from 110 mA to 100 µA in Stop mode (bandgap disabled) |
Applications
| Industrial Motor Control | HVAC Energy Management |
|---|---|
Use Scenario: Closed-loop speed regulation of 3-phase BLDC motors using PWM and Hall-effect feedback. IC Role / Device Role / Timing Role: Real-time controller executing PID loops at ≤10 kHz with deterministic interrupt latency from INT0/INT1. Use Value: 1-cycle instruction execution ensures sub-100 ns timer resolution and jitter-free 20 kHz PWM generation without cycle-counting overhead. |
Use Scenario: Centralized building climate controller managing zone dampers, compressors, and CO₂ sensors via RS-485. IC Role / Device Role / Timing Role: Dual-UART hub coordinating Modbus RTU communication and local sensor polling with watchdog supervision. Use Value: Two full-duplex serial ports eliminate external UART expanders; power-fail warning enables nonvolatile log save before brownout. |
| Uninterruptible Power Supply (UPS) | Vending Machine Controller |
Use Scenario: AC line monitoring, battery charge/discharge control, and inverter synchronization in 1–3 kVA UPS units. IC Role / Device Role / Timing Role: Safety-critical supervisor handling power-fail interrupt, early-warning voltage monitoring, and fail-safe shutdown sequencing. Use Value: VPFW/VRST separation (≥250 mV) guarantees reliable early alert at 4.375 V while maintaining operation down to 3.95 V - critical for hold-up time extension. |
Use Scenario: Cashless payment interface, inventory tracking, and mechanical actuator coordination in beverage/snack dispensers. IC Role / Device Role / Timing Role: Field-deployable host processor interfacing magstripe readers, bill validators, and stepper drivers via GPIO and MOVX peripherals. Use Value: 32 kB flash accommodates encrypted payment stack + UI firmware; 44-PLCC package allows direct socket replacement of legacy 8051 designs. |
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-QNL | 64 kB flash (vs. 32 kB), identical pinout/package, same 33 MHz max speed and peripheral set | Supports larger firmware images and bootloader+application partitioning; no change to PCB or driver code | Select when firmware exceeds 32 kB or future scalability is required - drop-in replacement per Maxim documentation |
| DS89C430-QNL | 16 kB flash (vs. 32 kB), identical pinout/package, same speed/peripherals; ROMSIZE register fully compatible | Suitable for cost-optimized designs where firmware fits in 16 kB; retains all timing and interrupt behavior | Choose for minimal BOM cost in volume production where flash headroom is not needed - pin- and code-compatible |
Compared with DS89C440-QNG, DS89C450-QNL offers double flash capacity with zero layout or firmware changes, while DS89C430-QNL reduces cost with 16 kB flash but preserves identical timing, interrupts, and peripheral behavior - both maintain full functional equivalence for legacy 8051 migration paths.
Availability
DS89C440-QNG is available at Aetrix Electronics and suitable for industrial motor control, HVAC energy management, uninterruptible power supplies, and vending machine controllers requiring stable component supply for long-lifecycle embedded programs.
Supply support for DS89C440-QNG 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) designs precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and communications systems.
The DS89C4xx family was engineered as ultra-high-speed 8051 drop-in replacements targeting legacy system upgrades - emphasizing pin compatibility, deterministic timing, and robust power-supply supervision for mission-critical control.
FAQ
Is DS89C440-QNG still in production?
No, DS89C440-QNG is discontinued by Maxim Integrated. However, Aetrix Electronics maintains legacy inventory and provides traceable, tested units for ongoing production and repair. Full datasheets, application notes, and the Ultra-High-Speed Flash Microcontroller User's Guide remain accessible via Analog Devices' archive portal for DS89C440-QNG design validation and migration planning.
What is the correct replacement for DS89C440-QNG?
The DS89C450-QNL is the documented drop-in replacement for DS89C440-QNG, sharing identical 44-pin PLCC packaging, pinout, timing, and peripheral functionality - only differing in flash size (64 kB vs. 32 kB). DS89C430-QNL (16 kB) is also pin-compatible and functionally identical, making it viable for firmware under 16 kB. Both require no PCB or schematic changes for DS89C440-QNG replacement.
Does DS89C440-QNG support in-system programming (ISP)?
Yes, DS89C440-QNG supports in-system programming via its primary UART (P3.0/P3.1) using the built-in ROM-resident bootloader. Firmware updates can be performed without removing the device from the board, provided the EA pin is high and the serial port is accessible. Programming requires standard 8051-compatible ISP protocol commands and operates at baud rates up to 115.2 kbps with 33 MHz clock.
What are the power supply requirements for DS89C440-QNG?
DS89C440-QNG requires a regulated +5 V supply (4.5 V to 5.5 V) with ≤100 mV ripple. It draws 110 mA typical in active mode at 33 MHz, 50 mA in Idle mode, and as low as 100 µA in Stop mode with bandgap disabled. Decoupling mandates 100 nF ceramic + 10 µF tantalum per VCC pin, placed within 5 mm of the DS89C440-QNG package body.
Can DS89C440-QNG operate with an external clock instead of a crystal?
Yes, DS89C440-QNG accepts an external CMOS-level clock signal applied to XTAL1 (Pin 1), with XTAL2 (Pin 2) left unconnected. The external clock must meet AC specifications: 0–33 MHz frequency, ≥10 ns high/low times, and ≤5 ns rise/fall times. Crystal mode remains supported for lower-jitter timing, but external clock simplifies layout in noise-isolated systems.
DS89C440-QNG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-LCC (J-Lead)
- 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:
- Surface Mount
- Supplier Device Package:
DS89C440-QNG FAQ
1.How can I place an order for DS89C440-QNG through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C440-QNG 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-QNG reliable?
The price and inventory of DS89C440-QNG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C440-QNG is usually 5 days.
3.What payment methods are accepted for DS89C440-QNG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C440-QNG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C440-QNG?
DS89C440-QNG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C440-QNG 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-QNG?
For technical support, including DS89C440-QNG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C440-QNG requirements.
6.How does Aetrix verify that DS89C440-QNG is sourced from the original manufacturer or authorized distributors?
All DS89C440-QNG 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-QNG meets industry standards.
7.What is the process for return or replacement of DS89C440-QNG?
All DS89C440-QNG units undergo pre-shipment inspection (PSI). If there is an issue with DS89C440-QNG, 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-QNG part is unused and in its original packaging.
Return procedure for DS89C440-QNG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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