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Analog Devices Inc./Maxim Integrated DS89C430-QNL
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- Part No.:
- DS89C430-QNL
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS89C430-QNL.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,801
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Product details
Overview
DS89C430-QNL from Maxim Integrated is a 16kB flash, 33MHz ultra-high-speed 8051-compatible microcontroller in 44-pin PLCC package, executing instructions at 1 clock per machine cycle and delivering up to 33 MIPS performance. It features dual data pointers, two full-duplex serial ports, programmable watchdog timer, and power-fail reset - deployed in industrial control, HVAC systems, and uninterruptible power supplies.
For engineers reviewing the DS89C430-QNL datasheet, DS89C430-QNL pinout, DS89C430-QNL application, or DS89C430-QNL equivalent, key selection considerations include its 44-PLCC footprint compatibility with DS89C450-QNL, 16kB in-system programmable flash, 1kB MOVX SRAM, and support for variable-length MOVX timing across external peripherals.
Technical Context
The DS89C430-QNL implements a fully static CMOS 8051-compatible core redesigned for one-clock-per-instruction execution, eliminating wasted cycles of legacy 8051 architectures. Its PMR register controls clock division (1× to 1024×) and crystal multiplication, enabling system clock derivation from 1–33MHz external sources while maintaining guaranteed timing across page modes.
It supports five memory-access modes via ROMSIZE feature, dynamically selecting internal program memory size (0–16kB), and enables EMI reduction by disabling ALE during idle external memory access. Dual DPTRs with automatic increment/decrement and toggle select accelerate block memory transfers without software overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | High-speed 8051, 1 clock per machine cycle - eliminates 11/12 wasted clocks vs. legacy 8051, enabling 12× faster instruction execution at same crystal frequency. |
| Max Clock Frequency | 33MHz system clock - delivers 33 MIPS throughput; supports external crystal (1–33MHz) or clock source with configurable multipliers/dividers. |
| Flash Memory | 16kB on-chip flash - in-application and in-system programmable via serial port; 10,000 write/erase cycles; 100-year data retention. |
| RAM | 1kB MOVX SRAM - dedicated external-data-space RAM accessible via MOVX instructions; separate from 256B internal RAM. |
| Operating Voltage | 4.5V to 5.5V - specified over full industrial temperature range (−40°C to +85°C); includes power-fail warning (VPFW = 4.2–4.6V) and reset trip point (VRST = 3.95–4.35V). |
| Power Modes | Active (75–110mA @33MHz), Idle (40–50mA), Stop (1–100μA bandgap disabled) - programmable clock divider enables 1024× CPU slowdown with automatic interrupt-driven wake-up. |
| Peripherals | Two full-duplex UARTs, three 16-bit timers/counters, 13 interrupt sources (6 external), five priority levels, programmable watchdog, power-fail interrupt, EMI reduction mode. |
Pinout & Package
DS89C430-QNL is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, lead-free/RoHS-compliant option available as DS89C430-QNL+. Pin 1 is index corner, pin count proceeds counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pins 1, 22, 23, 34) | Supply voltage input | +5V main power rail; four pins reduce IR drop and improve noise immunity in high-speed operation. |
| GND (Pins 16, 17, 28, 39) | Logic ground reference | Dedicated ground return paths minimize ground bounce across I/O and core domains. |
| RST (Pin 10) | Reset input/output | Bidirectional Schmitt-trigger input with internal 50–200kΩ pulldown; enables wire-OR reset networks without external RC. |
| XTAL1 (Pin 21), XTAL2 (Pin 20) | Clock oscillator interface | Supports fundamental-mode AT-cut crystals (1–33MHz) or external clock; XTAL1 accepts buffered clock input. |
| P0.0–P0.7 (Pins 39–32) | Multiplexed address/data bus | Open-drain port with weak pullups; outputs LSB address during ALE high, transitions to bidirectional data bus on ALE low. |
| P2.0–P2.7 (Pins 21–28) | MSB address bus / I/O | Provides A8–A15 during external memory access; supports page mode 1 (address + data) and page mode 2 (address + data) configurations. |
| P3.6 (WR, Pin 18), P3.7 (RD, Pin 19) | External memory strobes | Active-low write/read enable signals synchronized to ALE; timing configurable via MD bits for slow/fast peripheral interfacing. |
| EA (Pin 31) | External access control | Low = force external program memory fetch; high = execute from internal 16kB flash; enables seamless boot from flash or external ROM. |
Key Features
| Feature | Design Value |
|---|---|
| One-Cycle Instruction Execution | Eliminates 11/12 clock waste of standard 8051 - enables deterministic real-time response and 12× speedup at identical crystal frequency. |
| Dual Data Pointers (DPTR/DPTR1) | Accelerates block memory moves (e.g., memcpy) without software loop overhead; supports auto-increment/decrement and toggle-select for efficient DMA-like transfers. |
| Variable-Length MOVX Timing | MD2:MD0 bits add 2–9 machine-cycle stretches to MOVX reads/writes - simplifies interface to slow peripherals (ADCs, displays, EEPROMs) without glue logic. |
| ROMSIZE Configuration | Software-selectable internal program memory size (0–16kB) - allows dynamic remapping of external memory space while retaining full 64kB addressability. |
| EMI Reduction Mode | Disables ALE output when external memory is idle - reduces radiated emissions in noise-sensitive industrial and building automation environments. |
| Power-Fail Warning & Reset | VPFW threshold (4.2–4.6V) triggers early-warning interrupt before VRST (3.95–4.35V) forces reset - enables safe state save and controlled shutdown in UPS and power metering. |
Applications
| Industrial Control and Automation | HVAC System Controllers |
|---|---|
|
Use Scenario: Real-time monitoring and actuator control in PLC-based machinery with analog sensor inputs and relay outputs. IC Role / Device Role / Timing Role: Primary 8051-compatible controller executing deterministic control loops at ≤100μs intervals using 16-bit timers and dual UARTs for Modbus RTU communication. Use Value: 33MHz clock and 1-cycle execution ensure sub-microsecond instruction latency, enabling precise PWM generation and fast PID computation without external co-processors. |
Use Scenario: Embedded thermostat and chiller control unit managing temperature setpoints, fan speeds, and compressor staging across multi-zone buildings. IC Role / Device Role / Timing Role: Central MCU handling sensor fusion (NTC, humidity), serial communication (RS-485), and power-fail-safe state retention via internal flash and VPFW interrupt. Use Value: 16kB flash stores firmware + calibration tables; power-fail warning allows 5–10ms to save critical settings to nonvolatile memory before brownout. |
| Uninterruptible Power Supplies (UPS) | Building Energy Management Systems |
|
Use Scenario: Battery-backed AC/DC converter monitoring line voltage, battery charge level, and inverter status with failover coordination. IC Role / Device Role / Timing Role: Main supervisor MCU executing safety-critical power sequencing, battery health estimation, and RS-232/USB host communication. Use Value: Power-fail reset (VRST) and early-warning interrupt (VPFW) provide dual-layer protection; 1kB MOVX RAM buffers telemetry during brief outages. |
Use Scenario: Distributed gateway node aggregating lighting, occupancy, and environmental data from BACnet MS/TP field devices. IC Role / Device Role / Timing Role: Protocol bridge MCU running BACnet stack with dual UARTs (one for MS/TP, one for Ethernet bridge) and real-time scheduling via five interrupt priority levels. Use Value: Two full-duplex serial ports eliminate external UART expanders; 44-PLCC package fits compact DIN-rail mount enclosures with thermal margin for 24/7 operation. |
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 | 64kB flash (vs. 16kB), otherwise identical pinout, timing, and peripheral set; same 44-PLCC package and electrical specs. | Suitable where larger firmware image or bootloader + application partitioning is required; no hardware change needed. | Select DS89C450-QNL when future firmware growth or secure boot requirements demand >16kB embedded code space. |
| DS87C520-QCL+ | Lower max speed (33MHz vs. 33MHz), 16kB flash, but 12-clock-per-cycle legacy 8051 core; 44-PLCC, same pinout except P1.0–P1.7 alternate functions differ. | Compatible for timing-tolerant legacy 8051 code; lacks dual DPTR, variable MOVX, ROMSIZE, and power-fail features. | Choose DS87C520-QCL+ only for drop-in replacement of older designs where DS89C430-QNL's speed or advanced peripherals introduce timing or software migration risk. |
Compared with DS89C430-QNL, DS89C450-QNL offers scalable flash capacity without layout or firmware changes, while DS87C520-QCL+ provides backward-compatible timing behavior at the cost of modern power management and memory flexibility.
Availability
DS89C430-QNL is available at Aetrix Electronics and suitable for industrial control, HVAC systems, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for DS89C430-QNL 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 DS89C430-QNL belongs to Maxim's Ultra-High-Speed Flash Microcontroller family, designed to replace legacy 8051 systems with deterministic real-time performance, enhanced power management, and robust industrial interfacing - without sacrificing software compatibility.
FAQ
What is the maximum operating frequency of the DS89C430-QNL?
The DS89C430-QNL supports a maximum system clock frequency of 33MHz, achieving 33 million instructions per second (MIPS) performance. This is enabled by its one-clock-per-machine-cycle architecture, which executes instructions up to 12 times faster than a standard 8051 at the same crystal frequency. The device accepts external clock sources or crystals from 1MHz to 33MHz, with internal clock dividers and multipliers configured via the PMR register.
Does the DS89C430-QNL support in-system programming (ISP)?
Yes, the DS89C430-QNL supports in-system programming through its primary serial port (UART0) using ROM-resident or user-defined loader software. Its 16kB flash memory is both in-application programmable (IAP) and in-system programmable (ISP), allowing firmware updates without removing the device from the PCB. Programming requires only VCC, GND, RST, and the TXD0/RXD0 pins - no external high-voltage programmer is needed for field updates.
How does the power-fail detection work on the DS89C430-QNL?
The DS89C430-QNL integrates two independent voltage monitors: a power-fail warning (VPFW) comparator triggering at 4.2–4.6V and a reset trip point (VRST) at 3.95–4.35V. When VCC drops below VPFW, an early-warning interrupt alerts firmware to initiate safe shutdown procedures - such as saving state to flash or disabling outputs - with up to 10ms of margin before VRST forces a hardware reset. This dual-threshold design ensures reliable brownout handling in UPS and energy metering applications.
Is the DS89C430-QNL pin-compatible with other members of the DS89C4xx family?
Yes, the DS89C430-QNL is fully pin-compatible with the DS89C450-QNL in the same 44-pin PLCC package, sharing identical pin functions, timing, and electrical characteristics. Differences are limited to flash size (16kB vs. 64kB) and associated ROMSIZE configuration. It is also compatible with the DS89C430-ENL (44-TQFP) and DS89C430-MNL (40-PDIP) variants at the package-level interface, though mechanical footprint differs.
What memory architecture does the DS89C430-QNL use for data storage?
The DS89C430-QNL uses a dual-memory architecture: 256 bytes of internal direct-access RAM (compatible with standard 8051) plus 1kB of dedicated MOVX SRAM accessible only via MOVX instructions. This 1kB MOVX RAM serves as high-speed external data space - distinct from flash program memory - and is used for stack, buffers, and variables requiring fast read/write access without consuming internal RAM bandwidth.
DS89C430-QNL 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:
- 33MHz
- Connectivity:
- EBI/EMI, SIO, UART/USART
- Peripherals:
- Power-Fail Reset, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 16KB (16K 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:
DS89C430-QNL FAQ
1.How can I place an order for DS89C430-QNL through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C430-QNL 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 DS89C430-QNL reliable?
The price and inventory of DS89C430-QNL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C430-QNL is usually 5 days.
3.What payment methods are accepted for DS89C430-QNL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C430-QNL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C430-QNL?
DS89C430-QNL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C430-QNL 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 DS89C430-QNL?
For technical support, including DS89C430-QNL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C430-QNL requirements.
6.How does Aetrix verify that DS89C430-QNL is sourced from the original manufacturer or authorized distributors?
All DS89C430-QNL 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 DS89C430-QNL meets industry standards.
7.What is the process for return or replacement of DS89C430-QNL?
All DS89C430-QNL units undergo pre-shipment inspection (PSI). If there is an issue with DS89C430-QNL, 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 DS89C430-QNL part is unused and in its original packaging.
Return procedure for DS89C430-QNL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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