My Inquiry
My Account
Analog Devices Inc./Maxim Integrated DS89C450-ENL
- Part No.:
- DS89C450-ENL
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-TQFP
- Datasheet:
-
DS89C450-ENL.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,372
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS89C450-ENL from Maxim Integrated is a 64kB flash, 44-pin TQFP ultra-high-speed 8051-compatible microcontroller executing instructions at 1 clock per machine cycle, achieving 33 MIPS at 33MHz with dual data pointers, two full-duplex serial ports, and programmable watchdog timer - deployed in industrial control, HVAC, and uninterruptible power supplies.
For engineers reviewing the DS89C450-ENL datasheet, DS89C450-ENL pinout, DS89C450-ENL application, or DS89C450-ENL equivalent, key selection criteria include its 64kB in-system programmable flash, 1kB MOVX SRAM, 44-TQFP package with verified 8051 pin compatibility, and support for variable-length MOVX timing across external memory interfaces.
Technical Context
The DS89C450-ENL implements a redesigned 8051 core with one-clock-per-cycle execution, eliminating legacy 12-clock overhead; it supports five memory access modes (including page modes 1/2) and configurable MOVX stretch cycles (2–9 machine cycles) via MD2:MD0 bits to interface with slow peripherals.
Its power management includes programmable clock divider (1× to 1024×), automatic hardware/software exit from idle/stop modes, and EMI reduction via ALE disable during non-memory-access periods - all managed through dedicated SFRs like PMR and PCON.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8051-compatible, one-clock-per-machine-cycle execution enabling 33 MIPS at 33MHz crystal |
| Flash Memory | 64kB in-application programmable (IAP) and in-system programmable (ISP) via serial port |
| SRAM | 1kB dedicated MOVX-accessible SRAM for fast external data transfers |
| Operating Voltage | 4.5V to 5.5V - supports industrial-grade supply tolerance with 4.125V reset trip point |
| Temperature Range | -40°C to +85°C ambient - qualified for embedded industrial and building automation environments |
| Package | 44-pin TQFP (7mm × 7mm, 0.8mm pitch) - RoHS-compliant, surface-mount compatible |
| Interrupt System | 13 interrupt sources with five priority levels and six external interrupts (INT0–INT5) |
Pinout & Package
DS89C450-ENL is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8mm lead pitch and exposed thermal pad (not electrically connected). Pin numbering follows JEDEC MS-026 standard, with VCC/GND distributed across pins 16/17/28/39 and 4/10/11/12/13/14/15/29/30/31/32/33/34/35/36/37/38/40/41/42/43/44 for robust power integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pins 16,17,28,39) | Power Supply Input | +5V main supply with distributed decoupling points to minimize noise coupling into core logic |
| GND (Pins 4,10–15,29–38,40–44) | Logic Ground Reference | Multi-point ground return path ensuring stable reference for I/O, analog comparators, and reset circuitry |
| RST (Pin 9) | Reset Input/Output | Bidirectional Schmitt-triggered input with internal 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 as alternative |
| P0.0–P0.7 (Pins 33–40) | Multiplexed Address/Data Bus | Open-drain port with weak pullups; latched by ALE for external memory access - requires external pullups when used as GPIO |
| P2.0–P2.7 (Pins 18–25) | High-Order Address Bus / I/O | Provides A8–A15 during external memory access; functions as general-purpose I/O with strong drive capability |
| P3.6/P3.7 (Pins 12,13) | Memory Strobe Control | WR (write strobe) and RD (read strobe) outputs synchronized to ALE - enable precise timing for external RAM/peripherals |
| EA (Pin 29) | External Access Select | Logic-high enables internal 64kB flash; grounded forces external program memory fetch - critical for boot configuration |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointers (DPTR/DPTR1) | Enables zero-overhead block memory moves with automatic increment/decrement and toggle-select operation - accelerates firmware updates and buffer handling |
| Variable-Length MOVX Timing | Configurable 2–9 machine-cycle delays via MD2:MD0 bits - allows reliable interfacing with slow SRAM, EEPROM, or FPGA peripherals without software wait states |
| ROMSIZE Configuration | Software-selectable internal program memory size (0–64kB) - permits dynamic remapping of external address space while retaining full flash utilization |
| Power-Fail Detection | Integrated early-warning interrupt (VPFW = 4.2–4.6V) and reset (VRST = 3.95–4.35V) - enables graceful shutdown and nonvolatile state preservation in UPS and energy systems |
| EMI Reduction Mode | ALE disable during idle CPU cycles - reduces radiated emissions by eliminating unnecessary clock harmonics in sensitive medical or automotive applications |
Applications
| Industrial Control and Automation | HVAC Systems |
|---|---|
|
Use Scenario: Real-time monitoring and actuator control in PLC-based assembly lines with analog sensor inputs and relay outputs. IC Role / Device Role / Timing Role: Primary controller executing deterministic control loops at sub-millisecond intervals using Timer 0/1 and external interrupt triggers. Use Value: 33 MIPS throughput ensures <100µs response latency for 16-channel PID control, while dual serial ports support Modbus RTU master/slave coexistence. |
Use Scenario: Smart thermostat with temperature/humidity sensing, fan speed control, and remote Zigbee/Wi-Fi gateway bridging. IC Role / Device Role / Timing Role: Central MCU managing sensor polling, PWM fan drivers, and dual UART communication with cloud module and local display. Use Value: 64kB flash accommodates field-upgradable firmware and encryption libraries; power-fail interrupt preserves setpoint history during brownouts. |
| Uninterruptible Power Supplies | Building Energy Management |
|
Use Scenario: Battery-backed AC/DC converter with voltage/frequency regulation, battery health monitoring, and LCD status reporting. IC Role / Device Role / Timing Role: System supervisor coordinating ADC sampling, PWM generation for inverters, and serial communication with PC host. Use Value: Early-warning power-fail interrupt triggers immediate switchover to battery; 1kB MOVX SRAM buffers telemetry logs during grid outage. |
Use Scenario: Distributed lighting and HVAC controller node collecting occupancy, light-level, and CO₂ data across commercial floors. IC Role / Device Role / Timing Role: Edge node processor aggregating sensor data, running local decision logic, and forwarding via RS-485 to central BMS. Use Value: Dual serial ports enable simultaneous Modbus RTU (field bus) and ASCII protocol (gateway interface); 44-TQFP fits compact DIN-rail enclosure layouts. |
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, identical 44-TQFP pinout and core architecture - same instruction timing and peripheral register map | Suitable where firmware size ≤16kB suffices; lower cost for fixed-function controllers with minimal feature expansion | Select when flash headroom is not required and BOM cost optimization is prioritized over future firmware scalability |
| DS87C530-QNL | 32kB flash, PLCC-44 package, 25MHz max clock - lacks dual serial port and programmable MOVX timing | Legacy replacement in socketed designs where PLCC form factor is mandated and dual UART not needed | Choose only for backward compatibility in existing PLCC-based PCBs; not drop-in due to package and peripheral differences |
Compared with DS89C430-ENL and DS87C530-QNL, DS89C450-ENL provides 4× flash capacity and dual serial ports in the same 44-TQFP footprint - enabling secure OTA updates and multi-protocol gateways without layout changes, while maintaining full 8051 software compatibility.
Availability
DS89C450-ENL is available at Aetrix Electronics and suitable for industrial control and automation, HVAC systems, and uninterruptible power supplies requiring stable component supply across extended product lifecycles.
Supply support for DS89C450-ENL 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 high-performance analog, mixed-signal, and embedded processing solutions for industrial, communications, and consumer markets.
The DS89C450-ENL belongs to Maxim's Ultra-High-Speed Flash Microcontroller family, designed specifically to replace legacy 8051 systems with higher throughput, enhanced peripherals, and robust industrial operating margins - without requiring software rewrites.
FAQ
What is the maximum operating frequency of the DS89C450-ENL?
The DS89C450-ENL operates at up to 33MHz system clock frequency, delivering 33 million instructions per second (MIPS) with its one-clock-per-machine-cycle architecture. This performance is achieved using an external crystal or clock source applied to XTAL1/XTAL2, with internal clock dividers supporting lower-frequency operation for power savings. The DS89C450-ENL maintains full functionality across its entire 0–33MHz range under industrial temperature conditions (-40°C to +85°C).
Does the DS89C450-ENL support in-system programming (ISP)?
Yes, the DS89C450-ENL supports in-system programming via its primary serial port (UART0 on P3.0/P3.1) using ROM-resident or user-defined loader software. It does not require external parallel programming hardware for field updates. The 64kB flash memory is rated for 10,000 write/erase cycles with 100-year data retention, making DS89C450-ENL suitable for applications requiring frequent firmware revisions or secure remote updates.
How does the DS89C450-ENL handle power-fail conditions?
The DS89C450-ENL integrates a dedicated power-fail detection circuit with two thresholds: VPFW (4.2–4.6V) triggers an early-warning interrupt for controlled shutdown, while VRST (3.95–4.35V) initiates hardware reset. This dual-threshold design allows DS89C450-ENL to preserve critical state in nonvolatile registers or flash before power collapse - essential for uninterruptible power supplies and energy metering systems where data integrity is mandatory.
Is the DS89C450-ENL pin-compatible with standard 8051 microcontrollers?
Yes, the DS89C450-ENL is fully pin-compatible with standard 8051-family devices in the 44-TQFP package, including identical signal assignments for P0–P3, RST, XTAL1/XTAL2, EA, PSEN, and ALE/PROG. Its 8051 instruction set and SFR layout ensure binary compatibility for most legacy code, though timing-critical routines may require adjustment due to the 12× faster execution speed. DS89C450-ENL retains all standard 8051 peripherals - three timers, two serial ports, and four 8-bit I/O ports.
What memory configuration options does the DS89C450-ENL provide?
The DS89C450-ENL offers flexible memory mapping via the ROMSIZE feature, allowing software to dynamically select internal program memory size from 0 to 64kB while simultaneously accessing the full external address space. It includes 64kB on-chip flash for program storage and 1kB dedicated SRAM accessible via MOVX instructions - optimized for high-speed data transfers with external peripherals. This configuration enables DS89C450-ENL to serve as both standalone controller and interface bridge in complex embedded systems.
DS89C450-ENL 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:
- 33MHz
- 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-ENL FAQ
1.How can I place an order for DS89C450-ENL through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C450-ENL 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-ENL reliable?
The price and inventory of DS89C450-ENL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C450-ENL is usually 5 days.
3.What payment methods are accepted for DS89C450-ENL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C450-ENL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C450-ENL?
DS89C450-ENL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C450-ENL 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-ENL?
For technical support, including DS89C450-ENL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C450-ENL requirements.
6.How does Aetrix verify that DS89C450-ENL is sourced from the original manufacturer or authorized distributors?
All DS89C450-ENL 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-ENL meets industry standards.
7.What is the process for return or replacement of DS89C450-ENL?
All DS89C450-ENL units undergo pre-shipment inspection (PSI). If there is an issue with DS89C450-ENL, 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-ENL part is unused and in its original packaging.
Return procedure for DS89C450-ENL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS89C450-ENL Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
