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Analog Devices Inc./Maxim Integrated DS89C440-ENG
- Part No.:
- DS89C440-ENG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-TQFP
- Datasheet:
-
DS89C440-ENG.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 44TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS89C440-ENG from Maxim Integrated (formerly Dallas Semiconductor) is a discontinued 32 kB flash, 8051-compatible ultra-high-speed microcontroller operating up to 33 MHz with 1-cycle-per-instruction execution - delivering ~10× speed improvement over legacy 8051s at same crystal frequency. It features dual data pointers, two full-duplex UARTs, programmable watchdog timer, and power-fail reset, targeting industrial control and embedded data logging systems.
For engineers reviewing the DS89C440-ENG datasheet, DS89C440-ENG pinout, DS89C440-ENG application, or DS89C440-ENG equivalent, key selection considerations include its 32 kB internal flash size (between DS89C430's 16 kB and DS89C450's 64 kB), TQFP-44 package, 5 V operation, and drop-in replacement path to DS89C450 for new designs requiring higher memory density.
Technical Context
The DS89C440-ENG implements a fully static CMOS 8051-compatible core redesigned for one clock per machine cycle, eliminating the 12-clock overhead of standard 8051s. Its instruction throughput reaches 33 MIPS at 33 MHz, enabled by dual data pointers with automatic increment/decrement and toggle select, plus variable-length MOVX timing configurable via MD2–MD0 bits.
It supports four paged memory-access modes and dynamic ROMSIZE configuration to select internal program memory size (0–64 kB), allowing full external memory map access while retaining compatibility with legacy 8051 software - except for timing-critical routines requiring recalculation due to accelerated execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8051-compatible, 1-cycle-per-instruction execution - eliminates 12× clock penalty of legacy 8051, enabling true 33 MIPS at 33 MHz. |
| Flash Memory | 32 kB internal flash - provides intermediate code storage capacity between DS89C430 (16 kB) and DS89C450 (64 kB); in-system/in-application programmable via serial port. |
| Operating Voltage | 4.5 V to 5.5 V - compatible with standard 5 V industrial logic rails; includes power-fail warning (VPFW = 4.2–4.6 V) and reset trip point (VRST = 3.95–4.35 V). |
| Max Clock Frequency | 33 MHz system clock - supports external crystal (1–33 MHz) or external clock source; clock divider enables power management down to 1/1024 speed. |
| I/O & Peripherals | Four 8-bit bidirectional ports (P0–P3), three 16-bit timers, two full-duplex UARTs, 13 interrupt sources with five priority levels, and programmable watchdog timer. |
| Package | TQFP-44 - 10 mm × 10 mm body, 0.8 mm pitch; pin-compatible with DS89C430-ENL and DS89C450-ENL in same footprint. |
Pinout & Package
DS89C440-ENG is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch and 10 mm × 10 mm body size, RoHS-compliant and lead-free capable. Pin functions align with DS89C430/DS89C450 family pinout across PDIP, PLCC, and TQFP packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 16, 17, 28, 39) | Power supply input | Primary +5 V supply rail; multiple pins reduce IR drop and improve noise immunity in high-speed operation. |
| GND (Pin 16, 17, 28, 39) | Logic ground reference | Dedicated ground connections adjacent to VCC pins support stable power delivery and EMI reduction. |
| RST (Pin 4) | Active-high reset input | Bidirectional Schmitt-triggered pin with internal 50–200 kΩ pulldown; eliminates need for external RC network during power-up. |
| XTAL1 (Pin 15), XTAL2 (Pin 14) | Crystal oscillator interface | Supports fundamental-mode AT-cut crystals (1–33 MHz); XTAL1 accepts external clock source when crystal not used. |
| P0.0–P0.7 (Pins 37–30) | Multiplexed address/data bus (AD0–AD7) | Open-drain port with weak pullups; latched by ALE to provide LSB address during external memory access; tri-state on reset. |
| P2.0–P2.7 (Pins 18–25) | High-order address bus (A8–A15) | Bidirectional I/O port; outputs MSB address during external memory fetches; supports page mode addressing in extended memory configurations. |
| P3.6 (WR), P3.7 (RD) | External memory strobes | Active-low write/read control signals synchronized to ALE; timing configurable via PMR register for interfacing with slow peripherals. |
| EA (Pin 29) | External access enable | Logic high selects internal flash (32 kB) as program memory; grounded to force external program memory access while retaining internal RAM. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-High-Speed Core | Executes instructions in 30 ns at 33 MHz - 12× faster than legacy 8051 at same crystal frequency, enabling real-time response in motor control and data acquisition. |
| Dual Data Pointers (DPTR/DPTR1) | Enables simultaneous block moves between memory regions without software pointer management; automatic increment/decrement reduces loop overhead by ~40%. |
| Variable MOVX Timing | Configurable 2–9 machine-cycle delays via MD2–MD0 bits - allows reliable interfacing with legacy SRAM, EEPROM, and peripherals without hardware wait-state generators. |
| EMI Reduction Mode | Disables ALE output when external memory is idle - lowers radiated emissions by suppressing unnecessary high-frequency clock harmonics in building automation and medical devices. |
| Power-Fail Detection | Integrated VPFW comparator triggers early-warning interrupt before VRST threshold - enables safe data save-to-flash within 1–2 ms prior to brownout shutdown. |
Applications
| Data Logging Systems | Industrial HVAC Controllers |
|---|---|
Use Scenario: Continuous acquisition of temperature, humidity, and energy consumption metrics from analog/digital sensors with local flash storage and RS-232 upload. IC Role / Device Role / Timing Role: Primary controller executing deterministic sampling loops, managing dual UARTs for sensor comms and host interface, and scheduling flash writes during idle cycles. Use Value: 32 kB flash accommodates firmware + 1–2 weeks of timestamped sensor logs; 33 MHz core ensures sub-millisecond ADC trigger latency and jitter-free UART framing. |
Use Scenario: Zone-based climate regulation using thermistors, relays, and PWM fan drivers in commercial buildings with BACnet/Modbus connectivity. IC Role / Device Role / Timing Role: Real-time PID computation engine with interrupt-driven I/O handling, dual UARTs for fieldbus and debug, and watchdog supervision for fail-safe shutdown. Use Value: Dual data pointers accelerate coefficient table lookups; programmable clock divider reduces active current to 40 mA at 33 MHz, extending thermal margin in enclosed enclosures. |
| Uninterruptible Power Supplies (UPS) | Automotive Test Equipment |
Use Scenario: Monitoring AC line voltage, battery charge state, and inverter output in offline/line-interactive UPS units with LCD display and USB/RS-232 reporting. IC Role / Device Role / Timing Role: System supervisor coordinating analog monitoring, relay control, status display, and communication - responding to power-fail events within 100 µs. Use Value: Power-fail warning interrupt (VPFW) initiates immediate save-to-flash and graceful shutdown; 256-byte scratchpad + 1 kB MOVX RAM buffers transient event logs without external memory. |
Use Scenario: Portable diagnostic tools capturing CAN/LIN waveforms, decoding protocols, and generating test stimuli for ECU validation in lab and service environments. IC Role / Device Role / Timing Role: High-speed data aggregator synchronizing multi-channel digital inputs, buffering captured frames in internal RAM, and streaming via UART/USB bridge. Use Value: 33 MIPS throughput enables real-time pattern matching on 1 Mbps CAN streams; TQFP-44 package supports compact PCB layout with minimal signal routing skew. |
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-ENL | 64 kB flash (vs. 32 kB), identical TQFP-44 pinout, same core/peripherals, production-supported. | Supports larger firmware images and embedded web servers; suitable for future-proofing where memory headroom is critical. | Select DS89C450-ENL for new designs requiring guaranteed long-term availability and scalability beyond 32 kB code space. |
| DS89C430-ENL | 16 kB flash (vs. 32 kB), identical TQFP-44 pinout and electrical specs; lower cost, same speed and feature set. | Optimized for cost-sensitive applications with compact firmware (e.g., simple sensor nodes, basic controllers). | Choose DS89C430-ENL when firmware fits in 16 kB and BOM cost optimization is prioritized over memory headroom. |
Compared with DS89C440-ENG, DS89C450-ENL offers double the flash for complex protocol stacks without layout change, while DS89C430-ENL reduces cost by ~18% with no performance trade-off - making both viable alternatives depending on memory and lifecycle requirements.
Availability
DS89C440-ENG is available at Aetrix Electronics and suitable for industrial control, data logging, and building automation applications requiring stable component supply and legacy 8051 software compatibility.
Supply support for DS89C440-ENG 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 embedded processing solutions for industrial, automotive, and communications markets.
The DS89C4xx family was designed to deliver ultra-high-speed 8051 compatibility with enhanced peripherals and power management - bridging legacy firmware investment with modern real-time performance needs in resource-constrained embedded systems.
FAQ
Is DS89C440-ENG still in production?
No, DS89C440-ENG is discontinued and no longer manufactured by Maxim Integrated. It was superseded by DS89C450-ENL as a drop-in replacement with 64 kB flash. Aetrix Electronics maintains limited legacy stock for repair and maintenance programs, but new designs should target DS89C450-ENL or DS89C430-ENL based on memory requirements.
What is the correct replacement for DS89C440-ENG in new designs?
The DS89C450-ENL is the officially designated drop-in replacement for DS89C440-ENG, sharing identical TQFP-44 packaging, pinout, voltage ratings, and peripheral set - with only the flash size increased from 32 kB to 64 kB. DS89C450-ENL remains in active production and supported by Maxim's documentation and tools.
Does DS89C440-ENG support in-system programming (ISP)?
Yes, DS89C440-ENG supports in-system programming via its UART0 serial port using the ROM-resident bootloader. Firmware updates can be performed without removing the device from the PCB, provided the EA pin is high and the serial loader is invoked correctly - consistent with DS89C430/DS89C450 family behavior.
What are the power supply requirements for DS89C440-ENG?
DS89C440-ENG requires a 4.5 V to 5.5 V DC supply on VCC pins, with typical active current draw of 75–110 mA at 33 MHz. It includes integrated power-fail detection (VPFW = 4.2–4.6 V) and reset threshold (VRST = 3.95–4.35 V), enabling robust brownout handling without external supervisors.
Can DS89C440-ENG run legacy 8051 assembly code without modification?
Most legacy 8051 assembly code runs unchanged on DS89C440-ENG due to full instruction set and pin compatibility. However, timing-critical routines - especially those relying on instruction cycle counts for delays or baud rate generation - must be recalculated, as DS89C440-ENG executes each instruction in 1 clock cycle versus 12 in standard 8051s.
DS89C440-ENG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-TQFP
- Series:
- 89C
- Packaging:
- Bag
- 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-ENG FAQ
1.How can I place an order for DS89C440-ENG through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C440-ENG 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-ENG reliable?
The price and inventory of DS89C440-ENG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C440-ENG is usually 5 days.
3.What payment methods are accepted for DS89C440-ENG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C440-ENG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C440-ENG?
DS89C440-ENG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C440-ENG 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-ENG?
For technical support, including DS89C440-ENG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C440-ENG requirements.
6.How does Aetrix verify that DS89C440-ENG is sourced from the original manufacturer or authorized distributors?
All DS89C440-ENG 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-ENG meets industry standards.
7.What is the process for return or replacement of DS89C440-ENG?
All DS89C440-ENG units undergo pre-shipment inspection (PSI). If there is an issue with DS89C440-ENG, 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-ENG part is unused and in its original packaging.
Return procedure for DS89C440-ENG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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