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Analog Devices Inc./Maxim Integrated DS89C450-QNG
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- Part No.:
- DS89C450-QNG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS89C450-QNG.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,150
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Product details
Overview
DS89C450-QNG from Maxim Integrated is a 64kB ultra-high-speed 8051-compatible flash microcontroller operating up to 33MHz with 1-cycle-per-instruction execution, delivering 33 MIPS performance. It features dual data pointers, two full-duplex serial ports, and programmable power management for industrial control and data logging applications.
For engineers reviewing the DS89C450-QNG datasheet, DS89C450-QNG pinout, DS89C450-QNG application, or DS89C450-QNG equivalent, key selection criteria include flash size (64kB), PLCC-44 package compatibility, 33MHz max clock, dual serial ports, and in-system programmability via serial interface.
Technical Context
The DS89C450-QNG implements a redesigned 8051 core executing instructions in one system clock cycle-12× faster than legacy 8051 at identical crystal frequency. It supports variable MOVX timing (2–9 machine cycles) and four paged memory-access modes enabled by ROMSIZE configuration.
Its power management includes programmable clock division (up to 1024× slowdown) with automatic hardware/software exit, and EMI reduction via ALE disable during idle external memory access. The device integrates 1kB SRAM for MOVX operations and supports both internal flash and external program memory via EA pin control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | High-speed 8051, one-clock-per-machine-cycle execution |
| Max Clock Frequency | 33MHz - enables 33 MIPS throughput at 1 MIPS/MHz efficiency |
| Flash Memory | 64kB - in-application and in-system programmable via serial port |
| SRAM | 1kB dedicated MOVX RAM - accelerates external memory block transfers |
| Operating Voltage | 4.5V to 5.5V - supports industrial-grade supply tolerance with brownout detection |
| Temperature Range | -40°C to +85°C - qualified for extended industrial ambient operation |
| Interrupt System | 13 sources, 5 priority levels - enables deterministic real-time response in automation systems |
Pinout & Package
DS89C450-QNG is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, compatible with standard PLCC-44 sockets and reflow/reflow-soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 12) | Power Supply | +5V main supply input with 4.5–5.5V operating range and internal brownout monitoring |
| GND (Pin 22) | Ground Reference | Logic ground reference for all I/O and internal circuitry |
| RST (Pin 10) | Reset Control | Bidirectional reset pin with internal Schmitt trigger and 50–200kΩ pulldown - eliminates need for external RC network |
| XTAL1/XTAL2 (Pins 11, 13) | Clock Input/Output | Supports fundamental-mode AT-cut crystals (1–33MHz) or external clock source at XTAL1 |
| P0.0–P0.7 (Pins 39–32) | Multiplexed Address/Data Bus | Open-drain port providing AD0–AD7; latched by ALE for external memory interfacing |
| P2.0–P2.7 (Pins 21–28) | Address Bus High | Provides A8–A15 for external memory addressing; supports page mode 1/2 addressing schemes |
| P3.6/P3.7 (Pins 16, 17) | Memory Strobes | WR and RD signals for external data memory read/write control - fully synchronized with ALE timing |
| EA (Pin 31) | External Access Select | Configures boot source: high = internal flash, low = external program memory - enables hybrid memory mapping |
Key Features
| Feature | Design Value |
|---|---|
| Single-Cycle Instruction Execution | Enables 33 MIPS at 33MHz - eliminates timing recalibration when migrating from legacy 8051 designs |
| Dual Data Pointers (DPTR/DPTR1) | Accelerates block memory moves with automatic increment/decrement and toggle select - reduces firmware overhead in data buffering |
| Programmable MOVX Timing | Adjustable wait states (2–9 cycles) via MD2:MD0 bits - simplifies interface to slow peripherals without glue logic |
| Power-Fail Reset & Early Warning | Detects voltage drop below 4.375V (VPFW) and asserts reset at 4.125V (VRST) - ensures safe state capture before shutdown |
| EMI Reduction Mode | Disables ALE during non-memory-access cycles - lowers radiated emissions in noise-sensitive building control systems |
Applications
| Industrial Control and Automation | Data Logging |
|---|---|
Use Scenario: Real-time PLC I/O scanning and PID loop execution in factory floor controllers. IC Role / Device Role / Timing Role: Primary 8051-compatible controller managing sensor inputs, actuator outputs, and fieldbus communication. Use Value: 33MHz clock and single-cycle execution ensure sub-millisecond loop times with deterministic interrupt latency. | Use Scenario: Standalone environmental sensor node recording temperature, humidity, and power metrics over extended periods. IC Role / Device Role / Timing Role: Host MCU handling ADC sampling, timestamping, flash storage, and serial upload via RS-232/RS-485. Use Value: 64kB flash stores months of compressed logs; 1kB MOVX RAM buffers burst reads before flash writes. |
| HVAC Building Energy Management | Uninterruptible Power Supplies |
Use Scenario: Central HVAC controller coordinating chillers, VAV boxes, and occupancy sensors across multi-zone buildings. IC Role / Device Role / Timing Role: Main system controller interfacing with CAN/LON bus, analog sensors, and relay drivers. Use Value: Dual serial ports support simultaneous Modbus RTU (RS-485) and local debug (RS-232); ROMSIZE enables flexible firmware partitioning. | Use Scenario: Digital control unit monitoring battery voltage, inverter status, and load current while managing transfer switching. IC Role / Device Role / Timing Role: Safety-critical supervisor executing fast power-fail detection, graceful shutdown sequencing, and event logging. Use Value: Power-fail warning (VPFW) and reset (VRST) thresholds provide 200ms+ margin for EEPROM save before brownout; watchdog ensures recovery from lockup. |
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-QNL | 16kB flash, otherwise identical architecture, pinout, and peripheral set | Suitable where firmware footprint <16kB and cost sensitivity outweighs future upgrade headroom | Select DS89C430-QNL only if flash requirement is confirmed ≤16kB and long-term code growth is negligible |
| DS87C520-MNL | 32kB flash, 25MHz max clock, no ROMSIZE feature, lacks second serial port and dual DPTR | Legacy drop-in for older 8051 designs requiring moderate speed uplift but no advanced peripherals | Choose DS87C520-MNL only when backward compatibility with existing 25MHz board layouts is mandatory and dual serial ports are unnecessary |
Compared with DS89C430-QNL and DS87C520-MNL, DS89C450-QNG delivers 4× more flash than the former and 30% higher clock rate plus dual serial ports versus the latter-making it optimal for new designs requiring field-upgradable firmware and multi-protocol connectivity.
Availability
DS89C450-QNG is available at Aetrix Electronics and suitable for industrial control and automation, data logging, HVAC energy management, and uninterruptible power supply applications requiring stable component supply and long-term production continuity.
Supply support for DS89C450-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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability microcontrollers for industrial, automotive, and communications markets.
The DS89C450-QNG belongs to Maxim's Ultra-High-Speed Flash Microcontroller product line, designed specifically to replace legacy 8051-based systems with minimal firmware changes while enabling higher throughput, larger code storage, and enhanced peripheral integration.
FAQ
What is the maximum operating frequency of the DS89C450-QNG?
The DS89C450-QNG operates at a maximum system clock frequency of 33MHz. This enables single-cycle instruction execution and a peak performance of 33 million instructions per second (MIPS). The device supports external crystal frequencies from 1MHz to 33MHz and also accepts external clock sources, with timing validated across the full -40°C to +85°C industrial temperature range.
Does the DS89C450-QNG support in-system programming?
Yes, the DS89C450-QNG supports in-system programming (ISP) through its primary serial port (P3.0/P3.1) using ROM-resident or user-defined loader software. Its 64kB flash memory is also in-application programmable, allowing firmware updates without removing the device from the target board. External parallel programming remains supported for high-volume manufacturing.
What package type is used for the DS89C450-QNG?
The DS89C450-QNG uses a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated as QNG in Maxim's ordering nomenclature. This surface-mount package features J-shaped leads, is RoHS-compliant, and maintains pin compatibility with other DS89C4xx variants in PDIP and TQFP packages.
How does the DS89C450-QNG handle power-fail conditions?
The DS89C450-QNG incorporates a dedicated power-fail detection circuit that triggers an early warning interrupt when VCC drops below 4.375V (VPFW) and asserts a hardware reset when VCC falls to 4.125V (VRST). This two-threshold scheme provides deterministic time margin-typically >200μs at 5V supply-for saving critical state to flash or EEPROM before shutdown.
Is the DS89C450-QNG pin-compatible with standard 8051 microcontrollers?
Yes, the DS89C450-QNG is pin-compatible with standard 8051-family devices in all three supported packages (PDIP, PLCC, TQFP), including signal naming, I/O port structure, and control pin placement. It retains full 8051 instruction set compatibility and default 12-clock-per-cycle timer operation-ensuring drop-in replacement capability for most legacy 8051 designs.
DS89C450-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:
- 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-QNG FAQ
1.How can I place an order for DS89C450-QNG through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C450-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 DS89C450-QNG reliable?
The price and inventory of DS89C450-QNG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C450-QNG is usually 5 days.
3.What payment methods are accepted for DS89C450-QNG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C450-QNG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C450-QNG?
DS89C450-QNG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C450-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 DS89C450-QNG?
For technical support, including DS89C450-QNG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C450-QNG requirements.
6.How does Aetrix verify that DS89C450-QNG is sourced from the original manufacturer or authorized distributors?
All DS89C450-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 DS89C450-QNG meets industry standards.
7.What is the process for return or replacement of DS89C450-QNG?
All DS89C450-QNG units undergo pre-shipment inspection (PSI). If there is an issue with DS89C450-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 DS89C450-QNG part is unused and in its original packaging.
Return procedure for DS89C450-QNG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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