My Inquiry
My Account
Analog Devices Inc./Maxim Integrated DS89C450-MNL+
- Part No.:
- DS89C450-MNL+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
DS89C450-MNL+.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:418
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS89C450-MNL+ from Maxim Integrated is a 64kB flash, 40-pin PDIP-packaged, ultra-high-speed 8051-compatible microcontroller executing instructions at up to 33 MIPS with a 33MHz system clock, one-cycle-per-instruction architecture, and dual data pointers-designed for industrial control, data logging, and motor control systems requiring deterministic real-time response.
For engineers reviewing the DS89C450-MNL+ datasheet, DS89C450-MNL+ pinout, DS89C450-MNL+ application, or DS89C450-MNL+ equivalent, key selection criteria include its 64kB in-application programmable flash, 1kB MOVX SRAM, dual serial ports, five-level interrupt priority, and power-fail reset with early warning interrupt-critical for embedded systems operating in voltage-unstable environments.
Technical Context
The DS89C450-MNL+ implements a fully static, one-clock-per-machine-cycle 8051 core that eliminates wasted cycles of legacy 8051 designs, enabling 33MHz operation and 33 MIPS throughput. Its ROMSIZE feature dynamically selects internal program memory size (0–64kB), allowing full external memory map access without hardware changes.
It supports four paged memory-access modes and configurable MOVX timing (2–9 machine cycles) via MD2:MD0 bits, enabling reliable interfacing with slow peripherals. The device integrates a programmable clock divider (up to 1024×), automatic hardware/software exit from power-management mode, and EMI reduction via ALE disable during idle external memory access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | One-cycle-per-instruction 8051-compatible CPU, eliminating 11/12 wasted clocks per instruction vs. legacy 8051 |
| Max System Clock | 33MHz - enables 33 MIPS performance; crystal or external clock input supported |
| Flash Memory | 64kB on-chip, in-application programmable via serial port; 10,000 write/erase cycles, 100-year data retention |
| RAM | 256B on-chip scratchpad + 1kB dedicated MOVX SRAM for fast external data access |
| Interrupt System | 13 sources (6 external), five priority levels, and early-warning power-fail interrupt for graceful shutdown |
| Power Management | Programmable clock divider (1× to 1024×); stop mode draws ≤100µA with bandgap disabled |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3); P0 open-drain with weak pullups; P1/P2/P3 quasi-bidirectional with strong pulldown |
Pinout & Package
DS89C450-MNL+ uses a 40-pin plastic dual in-line package (PDIP) with 0.6-inch body width and standard through-hole mounting. Pin functions are electrically and mechanically identical to industry-standard 8051 PDIP packages, supporting direct socket replacement in legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 40) | Supply voltage input | +5V nominal; operates over 4.5V–5.5V; internal brownout monitor triggers reset below 3.95V |
| GND (Pin 20) | Logic ground reference | Common return for all digital and analog circuitry; decoupling capacitor required near VCC/GND pins |
| RST (Pin 9) | Reset input/output | Bidirectional Schmitt-triggered pin with 50–200kΩ internal pulldown; no external RC needed for power-up reset |
| XTAL1 (Pin 19), XTAL2 (Pin 18) | Clock oscillator interface | Supports fundamental-mode AT-cut crystals (1–33MHz) or external CMOS clock source; XTAL1 accepts clock input |
| P0.0–P0.7 (Pins 39–32) | Multiplexed address/data bus | Open-drain I/O; outputs LSB address during ALE high, then transitions to bidirectional data bus; requires pullups for I/O use |
| P2.0–P2.7 (Pins 21–28) | MSB address bus / I/O | Provides A8–A15 during external memory access; functions as general-purpose I/O otherwise; weak pullup on reset |
| P3.6 (WR, Pin 16), P3.7 (RD, Pin 17) | External memory strobes | Active-low signals controlling write/read cycles to external RAM/peripherals; compatible with 74LS373 latches |
| EA (Pin 31) | External access control | High = execute from internal 64kB flash; low = force external program memory access while retaining internal RAM |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-High-Speed Core | Executes all instructions in one system clock cycle-enabling 33 MIPS at 33MHz, eliminating timing recalibration for most legacy 8051 code |
| Dual Data Pointers (DPTR/DPTR1) | Accelerates block memory moves and string operations; supports automatic increment/decrement and toggle select for efficient buffer management |
| Configurable MOVX Timing | Adjustable wait states (2–9 machine cycles) via MD2:MD0 bits-ensures reliable interfacing with slow SRAM, EEPROM, or peripherals without software overhead |
| Power-Fail Detection | Integrated comparator monitors VCC and asserts early-warning interrupt at 4.2–4.6V, enabling safe data save before brownout reset at 3.95–4.35V |
| EMI Reduction Mode | Disables ALE output when not accessing external memory-reducing radiated emissions in noise-sensitive industrial environments |
Applications
| Data Logging Systems | Industrial Motor Control |
|---|---|
Use Scenario: Continuous acquisition and timestamped storage of sensor data (temperature, pressure, current) in standalone field units with limited power budget. IC Role / Device Role / Timing Role: Primary controller managing ADC sampling, flash write sequencing, real-time clock synchronization, and serial telemetry upload. Use Value: 64kB flash enables multi-day buffered logging; power-fail interrupt ensures last-record integrity; 33MHz core handles concurrent tasks without missing samples. | Use Scenario: Closed-loop speed/torque regulation of BLDC or stepper motors using PWM, encoder feedback, and thermal monitoring. IC Role / Device Role / Timing Role: Real-time motion controller executing PID loops, generating 16-bit PWM waveforms, and processing quadrature encoder inputs with deterministic latency. Use Value: One-cycle instruction execution guarantees sub-1µs loop jitter; dual serial ports support encoder interface and HMI communication simultaneously. |
| HVAC Energy Management | Uninterruptible Power Supplies (UPS) |
Use Scenario: Centralized building controller coordinating chillers, VAV boxes, and occupancy sensors to optimize energy consumption across zones. IC Role / Device Role / Timing Role: System supervisor handling Modbus RTU communication, schedule-based actuator control, fault logging, and ambient sensor fusion. Use Value: Five-level interrupt priority isolates critical HVAC safety logic (e.g., high-temp shutoff) from background tasks; 1kB MOVX RAM buffers network packet payloads. | Use Scenario: Line-interactive UPS monitoring AC input, battery charge state, inverter status, and load demand while maintaining clean output during grid anomalies. IC Role / Device Role / Timing Role: Fault-tolerant supervisor managing battery charging algorithms, transfer switching, self-test routines, and RS-232/USB host interface. Use Value: Early-warning power-fail interrupt triggers immediate switchover to battery; watchdog timer prevents firmware lockup during voltage transients. |
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-MNL+ | 16kB flash, same 40-pin PDIP package, identical pinout and core architecture | Suitable where firmware size <16kB; lower cost but limits feature-rich applications | Select when flash capacity requirements are confirmed ≤16kB and BOM cost optimization is prioritized |
| DS87C520 | Legacy 8051 derivative; 12-clock-per-cycle core; max 33MHz but only ~2.75 MIPS; no ROMSIZE or dual DPTR | Used in older designs requiring strict 8051 timing compatibility; lacks power-fail detection and EMI reduction | Choose only for drop-in replacement in existing DS87C520 sockets where performance upgrade is not required |
Compared with DS89C430-MNL+, DS89C450-MNL+ provides 4× more flash for complex firmware and bootloader separation, while DS87C520 offers lower performance and no modern power/fault management-making DS89C450-MNL+ optimal for new designs demanding speed, reliability, and code scalability.
Availability
DS89C450-MNL+ is available at Aetrix Electronics and suitable for industrial control, data logging, and motor control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for DS89C450-MNL+ 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 belongs to Maxim's Ultra-High-Speed Flash Microcontroller product line, engineered to replace legacy 8051s in performance-constrained embedded systems while preserving software and hardware compatibility.
FAQ
What is the maximum operating frequency of the DS89C450-MNL+?
The DS89C450-MNL+ supports a maximum system clock frequency of 33MHz, delivering 33 million instructions per second (MIPS) due to its one-cycle-per-instruction architecture. This is achieved using either an external crystal (1–33MHz) or CMOS clock source, with internal clock division/multiplication controlled by the PMR register.
Does the DS89C450-MNL+ support in-system programming of its flash memory?
Yes, the DS89C450-MNL+ supports in-system programming (ISP) of its 64kB flash memory through the serial port (UART0 or UART1) using ROM-resident or user-defined loader software. It also supports in-application programming (IAP), enabling firmware updates without halting main application execution.
How does the power-fail detection feature work on the DS89C450-MNL+?
The DS89C450-MNL+ integrates a dedicated voltage monitor that asserts an early-warning power-fail interrupt when VCC drops to 4.2–4.6V, followed by a hard reset at 3.95–4.35V. This two-threshold scheme allows the firmware to safely save critical data before the system becomes nonfunctional.
Is the DS89C450-MNL+ pin-compatible with standard 8051 microcontrollers in PDIP packages?
Yes, the DS89C450-MNL+ is fully pin-compatible with industry-standard 40-pin 8051-family microcontrollers (e.g., AT89C51, DS80C320) in PDIP packages. Its pin assignments-including P0–P3, RST, XTAL1/XTAL2, EA, ALE, PSEN, RD, and WR-match legacy 8051 layouts, enabling direct socket replacement.
What are the key differences between DS89C450-MNL+ and DS89C430-MNL+?
The DS89C450-MNL+ and DS89C430-MNL+ share identical packaging, pinout, core architecture, and peripheral set-but differ in flash capacity: DS89C450-MNL+ provides 64kB, while DS89C430-MNL+ provides 16kB. Both support in-system programming, dual serial ports, and power-fail detection.
DS89C450-MNL+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Series:
- 89C
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
DS89C450-MNL+ FAQ
1.How can I place an order for DS89C450-MNL+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C450-MNL+ 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-MNL+ reliable?
The price and inventory of DS89C450-MNL+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C450-MNL+ is usually 5 days.
3.What payment methods are accepted for DS89C450-MNL+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C450-MNL+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C450-MNL+?
DS89C450-MNL+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C450-MNL+ 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-MNL+?
For technical support, including DS89C450-MNL+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C450-MNL+ requirements.
6.How does Aetrix verify that DS89C450-MNL+ is sourced from the original manufacturer or authorized distributors?
All DS89C450-MNL+ 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-MNL+ meets industry standards.
7.What is the process for return or replacement of DS89C450-MNL+?
All DS89C450-MNL+ units undergo pre-shipment inspection (PSI). If there is an issue with DS89C450-MNL+, 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-MNL+ part is unused and in its original packaging.
Return procedure for DS89C450-MNL+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS89C450-MNL+ 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…
