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Analog Devices Inc./Maxim Integrated DS89C450-ENG
- Part No.:
- DS89C450-ENG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-TQFP
- Datasheet:
-
DS89C450-ENG.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,354
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Product details
Overview
DS89C450-ENG from Maxim Integrated is a 64kB flash, 33MHz ultra-high-speed 8051-compatible microcontroller with dual data pointers, two full-duplex UARTs, and programmable power management. It executes instructions in one clock cycle (vs. 12 in legacy 8051), delivers 33 MIPS at 33MHz, and supports in-system programming via serial port. Used in industrial control, HVAC, and uninterruptible power supplies where deterministic timing and legacy 8051 software compatibility are critical.
For engineers reviewing the DS89C450-ENG datasheet, DS89C450-ENG pinout, DS89C450-ENG application, or DS89C450-ENG equivalent, key selection criteria include its 64kB on-chip flash memory size, 44-pin TQFP package, 33MHz maximum clock rate, single-cycle instruction execution, and dual serial port support for concurrent host/peripheral communication.
Technical Context
The DS89C450-ENG implements a redesigned 8051 core executing all instructions in one system clock cycle, enabling up to 12× speed improvement over standard 8051 at identical crystal frequency. Its ROMSIZE feature dynamically selects internal program memory size (0–64kB), allowing full external memory map access without hardware changes.
It integrates two independent 16-bit timer/counters, five levels of interrupt priority, and a programmable watchdog timer. Power management includes a clock divider supporting 1× to 1024× slowdown, with automatic hardware/software exit - critical for battery-backed systems requiring low-power sleep and fast wake-up response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | High-speed 8051-compatible, one-clock-per-machine-cycle execution |
| Max Clock Frequency | 33MHz - enables 33 MIPS performance with no external wait states |
| Flash Memory | 64kB - supports large firmware images and field-upgradable applications |
| RAM | 1kB SRAM for MOVX operations - accelerates external memory block transfers |
| Operating Voltage | 4.5V to 5.5V - compatible with standard 5V industrial logic and power rails |
| Temperature Range | -40°C to +85°C - qualified for industrial and automotive test equipment environments |
| Power-Fail Reset | VRST = 3.95–4.35V - provides deterministic brownout recovery without external supervisor IC |
Pinout & Package
DS89C450-ENG is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8mm lead pitch, RoHS-compliant and lead-free (denoted by "+" suffix). The package supports surface-mount reflow assembly and provides thermal and electrical performance suitable for high-density industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 16, 17, 28, 39) | Supply voltage input | Four dedicated VCC pins reduce IR drop and improve noise immunity across high-speed operation |
| GND (Pin 6, 38) | Logic ground reference | Dual GND pins provide low-inductance return path for digital I/O and core logic |
| RST (Pin 4) | Active-high reset input | Bidirectional with internal Schmitt trigger and 50–200kΩ pulldown - eliminates need for external RC network |
| XTAL1/XTAL2 (Pins 14, 15) | Crystal oscillator interface | Supports fundamental-mode AT-cut crystals up to 33MHz; XTAL1 accepts external clock source |
| P0.0–P0.7 (Pins 33–37, 39–42) | Multiplexed address/data bus (AD0–AD7) | Open-drain with weak pullups - functions as 8-bit I/O or lower address/data bus during ALE strobe |
| P2.0–P2.7 (Pins 18–25) | Upper address bus (A8–A15) | Provides MSB for external memory access; supports page mode addressing in extended memory configurations |
| P3.6/P3.7 (Pins 12, 13) | WR/RD strobes | Directly drive external memory write/read cycles - compatible with standard 8051 peripheral timing |
| EA (Pin 29) | External access select | Logic high enables internal 64kB flash; grounded forces external program memory access |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointers (DPTR/DPTR1) | Enables zero-overhead block memory moves between internal RAM and external peripherals without software overhead |
| Variable-Length MOVX Timing | MD2:MD0 bits configure MOVX access from 2–9 machine cycles - accommodates slow SRAM, EEPROM, or FPGA interfaces |
| ROMSIZE Programmability | Software-selectable internal program memory size (0–64kB) - allows dynamic partitioning of flash for bootloader/application code |
| EMI Reduction Mode | Disables ALE during idle periods - reduces radiated emissions in building automation and medical equipment |
| Early Warning Power-Fail Interrupt | VPFW = 4.2–4.6V threshold triggers interrupt before reset - enables safe data save and controlled shutdown sequence |
| Seven External Interrupt Sources | INT2–INT5 added on Port 1 - supports real-time event handling in motor control and vending systems without polling |
Applications
| Industrial Control and Automation | HVAC Systems |
|---|---|
|
Use Scenario: Real-time monitoring and actuator control in PLC-based factory machinery. IC Role / Device Role / Timing Role: Primary controller executing deterministic ladder logic with sub-millisecond I/O response. Use Value: Single-cycle 8051 core ensures consistent 33MHz timing margins for safety-critical motion control loops. |
Use Scenario: Zone-level temperature, humidity, and airflow regulation in commercial buildings. IC Role / Device Role / Timing Role: Central HVAC node managing sensor fusion, PID computation, and multi-stage compressor/fan sequencing. Use Value: Dual UARTs enable simultaneous Modbus RTU (fieldbus) and BACnet MS/TP (building network) communication stacks. |
| Uninterruptible Power Supplies | Automotive Test Equipment |
|
Use Scenario: Battery backup monitoring, AC line sensing, and inverter gate control during grid failure. IC Role / Device Role / Timing Role: System supervisor coordinating power-path switching, battery SOC estimation, and fault logging. Use Value: Power-fail warning interrupt (VPFW) and brownout reset (VRST) provide 100ms+ margin for nonvolatile data save before shutdown. |
Use Scenario: On-bench validation of ECU firmware, CAN transceiver behavior, and sensor signal conditioning. IC Role / Device Role / Timing Role: Host-side protocol bridge translating USB-to-serial commands into precise timing-controlled stimulus signals. Use Value: 33MHz clock and programmable MOVX timing allow accurate emulation of automotive microcontroller timing windows. |
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-ENL+ | 16kB flash, same 44-pin TQFP package, identical pinout and core architecture | Limited to smaller firmware footprints; insufficient for complex protocol stacks or GUI logic | Select when cost sensitivity outweighs memory headroom and firmware scalability requirements |
| DS87C520-MNL | 32kB flash, 33MHz max, but 12-clock-per-cycle legacy 8051 core - ~3× slower instruction throughput | Requires timing-critical code rewrite; lacks dual UARTs and early power-fail interrupt | Choose only for legacy 8051 drop-in replacement where speed and peripheral expansion are not required |
Compared with DS89C450-ENG, DS89C430-ENL+ offers identical packaging and speed but half the flash capacity, limiting firmware complexity; DS87C520-MNL retains full 8051 compatibility but sacrifices 10× performance and modern power management features essential for energy-sensitive test gear.
Availability
DS89C450-ENG is available at Aetrix Electronics and suitable for industrial control and automation, HVAC systems, and uninterruptible power supplies requiring stable component supply across long product lifecycles.
Supply support for DS89C450-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 (now part of Analog Devices) designs precision analog, mixed-signal, and high-reliability microcontrollers for industrial, automotive, and communications markets.
The DS89C450-ENG belongs to Maxim's Ultra-High-Speed Flash Microcontroller family, engineered to deliver 8051 software compatibility with modern performance, power efficiency, and in-system programmability for legacy migration and new industrial designs.
FAQ
What is the maximum operating frequency of the DS89C450-ENG?
The DS89C450-ENG operates at up to 33MHz system clock frequency, achieving 33 million instructions per second (MIPS) with its one-clock-per-instruction architecture. This is confirmed in the AC Characteristics table under "System Clock External Oscillator," where 1/tCLCL is specified as 0–33MHz across all page modes. The device maintains full functionality and timing compliance within this range when supplied with 4.5V–5.5V and operating from -40°C to +85°C.
Does the DS89C450-ENG support in-system programming (ISP)?
Yes, the DS89C450-ENG supports in-system programming through its serial port using ROM-resident or user-defined loader software. The datasheet explicitly states that flash memory is "in-system programmable through serial port," and the Ultra-High-Speed Flash Microcontroller User's Guide (available at maxim-ic.com/microcontrollers) details the protocol. No external parallel programmer is required for field updates, though external parallel programming remains an option for volume manufacturing.
How does the DS89C450-ENG handle power-fail conditions?
The DS89C450-ENG incorporates both a power-fail reset (VRST = 3.95–4.35V) and an early warning power-fail interrupt (VPFW = 4.2–4.6V). When VCC drops below VPFW, the device asserts an interrupt to initiate safe data save routines; if VCC continues falling below VRST, a hardware reset occurs. This two-threshold scheme provides deterministic, software-controllable shutdown - eliminating need for external supervisors in UPS and battery-backed instrumentation.
Is the DS89C450-ENG pin-compatible with standard 8051 microcontrollers?
Yes, the DS89C450-ENG is pin-compatible with standard 8051-family devices in all three packages (PDIP, PLCC, TQFP), including identical pin functions for P0–P3, RST, XTAL1/XTAL2, EA, PSEN, and ALE. The datasheet confirms "pin compatible with all three packages of the standard 8051" and notes that it can "drop into an existing socket for the 8xC51 family." Software compatibility is maintained except for timing-critical routines due to its 12× faster execution.
What memory configuration options does the DS89C450-ENG offer?
The DS89C450-ENG provides 64kB of on-chip flash memory and 1kB of MOVX-accessible SRAM. Its ROMSIZE feature allows software-selectable internal program memory size (0–64kB), enabling dynamic allocation between bootloader and application space. External memory access is fully supported via P0/P2 address/data bus and P3.6/P3.7 WR/RD strobes, with configurable MOVX timing (2–9 cycles) to interface with diverse peripherals.
DS89C450-ENG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-TQFP
- Series:
- 89C
- Packaging:
- Tray
- 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:
- 64KB (64K 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:
DS89C450-ENG FAQ
1.How can I place an order for DS89C450-ENG through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C450-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 DS89C450-ENG reliable?
The price and inventory of DS89C450-ENG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C450-ENG is usually 5 days.
3.What payment methods are accepted for DS89C450-ENG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C450-ENG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C450-ENG?
DS89C450-ENG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C450-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 DS89C450-ENG?
For technical support, including DS89C450-ENG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C450-ENG requirements.
6.How does Aetrix verify that DS89C450-ENG is sourced from the original manufacturer or authorized distributors?
All DS89C450-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 DS89C450-ENG meets industry standards.
7.What is the process for return or replacement of DS89C450-ENG?
All DS89C450-ENG units undergo pre-shipment inspection (PSI). If there is an issue with DS89C450-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 DS89C450-ENG part is unused and in its original packaging.
Return procedure for DS89C450-ENG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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