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Analog Devices Inc./Maxim Integrated DS2250-32-16
- Part No.:
- DS2250-32-16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 40-SIMM
- Datasheet:
-
DS2250-32-16.pdf
- Description:
- IC MCU 8BIT 32KB NVSRAM 40SIMM
- Quantity:
- Payment:
- Shipping:
Inventory:1,857
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Product details
Overview
DS2250-32-16 from Maxim Integrated is an 8-bit 8051-compatible soft microcontroller module with 32kB nonvolatile SRAM, 16MHz maximum crystal speed, and no integrated real-time clock. It operates across 0°C to +70°C, consumes 48mA at 16MHz, and supports serial bootstrap loading and in-system programmability for embedded security applications.
For engineers reviewing the DS2250-32-16 datasheet, DS2250-32-16 pinout, DS2250-32-16 application, or DS2250-32-16 equivalent, key selection considerations include nonvolatile RAM retention without VCC, power-fail reset/interrupt, on-chip UART, 32 I/O lines, and compatibility with standard 8051 development tools.
Technical Context
The DS2250-32-16 implements a fully 8051-object-code-compatible CPU core with internal nonvolatile SRAM used for both program and data storage. Its memory map supports separate 64kB program and data address spaces, with ECE2 bit enabling alternate mapping for external peripherals.
It features dual programming modes: serial ASCII-based bootstrap loader (9600/2400/1200/300 bps) and parallel load cycles timing-compatible with 87C51H. Power management includes stop mode (80µA), idle mode (6.2mA @8MHz), and early-warning power-fail interrupt triggered at VPFW = 4.15–4.75V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8051-compatible 8-bit CPU with object-code compatibility for existing cross-assemblers and compilers |
| Nonvolatile RAM | 32kB SRAM retains full program/data state >10 years at room temperature without VCC |
| Max Clock Speed | 16MHz crystal oscillator frequency enables real-time control at high instruction throughput |
| Operating Voltage | 4.05–4.65V minimum VCC ensures reliable operation during brown-out conditions |
| I/O Count | 32 parallel I/O lines (Ports 0–3) support direct peripheral interfacing without external glue logic |
| Serial Interface | Full-duplex UART (P3.0/P3.1) enables firmware updates and diagnostics over 3-wire RS-232 interface |
| Power Fail Detection | Dedicated VPFW input triggers interrupt before VCC drops below functional threshold, enabling safe state save |
| Reset Logic | Active-high RST with internal pulldown eliminates need for external RC reset circuitry |
Pinout & Package
DS2250-32-16 uses a 40-pin SIMM package (2.65" × 2.38") with through-hole mounting and gold-plated contacts. Pin pitch is 0.100", compatible with standard SIMM sockets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40 | P0.0–P0.7, P1.0–P1.7, P2.0–P2.7, P3.0–P3.7 | 32 general-purpose I/O lines; Port 0 is open-drain requiring external pullups, others are quasi-bidirectional |
| 17 | RST | Active-high reset input; internal pulldown allows unconnected use; no external RC needed |
| 19, 21 | RXD / TXD | UART serial interface pins; not directly compatible with PC COM ports without level translation |
| 23, 25 | INT0 / INT1 | Active-low external interrupt inputs supporting edge-triggered or level-sensitive wake-up |
| 27, 29 | T0 / T1 | Timer/counter external event inputs accepting TTL-level pulses |
| 31, 33 | WR / RD | Expanded bus strobes for external memory or peripheral access in multiplexed address/data mode |
| 35, 37 | XTAL2 / XTAL1 | Crystal oscillator connections; XTAL1 is inverter input, XTAL2 is output; supports 1–16MHz crystals |
| 2, 39 | VCC / GND | Single 5V supply and logic ground; decoupling required per layout guidelines |
| 24 | PSEN | Program store enable output; used to enable external program memory or invoke bootstrap loader |
| 22 | ALE | Address latch enable for demultiplexing Port 0 address/data bus; doubles as PROG signal during parallel programming |
| 20 | EA | External access control; must be tied to +5V to enable internal NV RAM; pulled down internally |
Key Features
| Feature | Design Value |
|---|---|
| Self-modifying code capability | Allows runtime firmware updates and adaptive configuration without external reprogramming hardware |
| Encrypted software execution | Prevents reverse engineering by executing ciphered instructions directly from NV RAM using on-chip decryption |
| Power-fail interrupt & reset | Enables deterministic state preservation before power loss, critical for secure logging and transaction integrity |
| Watchdog timer | Hardware-based timeout protection prevents system lockup in safety-critical embedded environments |
| On-chip serial bootstrap loader | Eliminates need for dedicated programmers; supports Intel HEX file loading via simple 3-wire UART interface |
| Security lock mechanism | Irreversible MCON.0 bit setting prevents unauthorized readback or modification of encrypted firmware |
Applications
| Secure Data Logger | Industrial Controller |
|---|---|
Use Scenario: Battery-backed environmental monitoring unit recording sensor data with tamper-proof timestamps and cryptographic signatures. IC Role / Device Role / Timing Role: DS2250-32-16 acts as main controller and secure execution engine, managing sensor reads, encryption, and nonvolatile storage without external memory. Use Value: 32kB NV RAM stores months of encrypted logs; power-fail interrupt ensures no data loss during unexpected shutdowns. | Use Scenario: Programmable logic controller (PLC) module controlling motor sequences and I/O in factory automation systems. IC Role / Device Role / Timing Role: DS2250-32-16 serves as real-time deterministic controller with precise timing via 16MHz crystal and two hardware timers. Use Value: 32 I/O lines drive relays and accept limit switches directly; watchdog timer guarantees fail-safe behavior under fault conditions. |
| Smart Meter Firmware Core | Embedded Security Module |
Use Scenario: Electricity meter performing tariff calculation, tamper detection, and secure communication with utility backend. IC Role / Device Role / Timing Role: DS2250-32-16 executes certified billing algorithms and handles AES-encrypted data transmission via UART. Use Value: Encrypted software execution prevents firmware extraction; 10-year NV RAM retention meets regulatory data audit requirements. | Use Scenario: Hardware security module (HSM) add-on for legacy systems requiring cryptographic key management and secure boot. IC Role / Device Role / Timing Role: DS2250-32-16 functions as isolated secure enclave, isolating key generation and signing operations from host processor. Use Value: On-chip security lock and self-modifying code prevent physical or logical extraction of private keys stored in NV RAM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar soft microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2250T-32-16 | Includes permanently powered real-time clock (RTC) with on-board crystal; otherwise identical architecture and pinout | Required where timestamping, calendar functions, or time-triggered events are essential | Select DS2250T-32-16 only if RTC functionality is mandatory; DS2250-32-16 reduces BOM cost and board space when timekeeping is unnecessary |
| DS5000T-32-16 | Functionally identical CPU and memory architecture but housed in ceramic DIP package instead of SIMM form factor | Suitable for prototyping or low-volume designs where socket-based insertion and manual rework are preferred | Choose DS5000T-32-16 for breadboard evaluation or legacy PCB layouts; DS2250-32-16 targets high-density, automated SIMM-based production |
Compared with DS2250T-32-16, the DS2250-32-16 omits RTC circuitry to reduce cost and power, while DS5000T-32-16 trades SIMM packaging for DIP compatibility-making DS2250-32-16 optimal for compact, volume-manufactured secure controllers needing no onboard timekeeping.
Availability
DS2250-32-16 is available at Aetrix Electronics and suitable for secure data loggers, industrial PLC modules, smart meter firmware cores, embedded security modules, and tamper-resistant telemetry systems requiring stable component supply and long-term lifecycle support.
Supply support for DS2250-32-16 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 secure microcontroller solutions for industrial, medical, and communications markets.
The DS2250-32-16 belongs to Maxim's Secure Microcontroller family, engineered for applications demanding nonvolatile code persistence, cryptographic firmware protection, and deterministic power-loss recovery in harsh environments.
FAQ
What is the memory retention period for DS2250-32-16 without power?
The DS2250-32-16 retains all program and data in its 32kB nonvolatile SRAM for over 10 years at room temperature (25°C) with no applied VCC. This specification is measured and guaranteed under standard storage conditions without battery backup or external energy sources.
Does DS2250-32-16 include a real-time clock (RTC)?
No, DS2250-32-16 does not include an integrated real-time clock. The "T" suffix in variants like DS2250T-32-16 denotes inclusion of a permanently powered RTC with on-board crystal; DS2250-32-16 omits this function to reduce cost and complexity for applications not requiring timestamping.
How is firmware loaded into DS2250-32-16 during production?
Firmware is loaded into DS2250-32-16 via its serial bootstrap loader using a 3-wire UART interface (RXD/TXD/GND) at standard baud rates (9600/2400/1200/300 bps), or through parallel programming cycles compatible with 87C51H timing. Both methods support Intel HEX format and allow in-system programming after PCB assembly.
What packaging format does DS2250-32-16 use?
DS2250-32-16 uses a 40-pin SIMM (Single In-line Memory Module) package measuring 2.65" × 2.38", designed for vertical insertion into industry-standard SIMM sockets. It is not a DIP or QFP device-this form factor enables high-density, automated placement in secure embedded systems.
Can DS2250-32-16 execute encrypted software?
Yes, DS2250-32-16 supports encrypted software execution using on-chip decryption. Developers load ciphered Intel HEX files via the serial loader, and the DS2250-32-16 decrypts instructions in real time during fetch cycles-preventing unauthorized disclosure of proprietary firmware logic or cryptographic keys.
DS2250-32-16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 40-SIMM
- Series:
- DS225x
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- SIO, UART/USART
- Peripherals:
- Power-Fail Reset, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- NVSRAM
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- 4.75V ~ 5.25V
- Data Converters:
- -
- Oscillator Type:
- External
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
DS2250-32-16 FAQ
1.How can I place an order for DS2250-32-16 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2250-32-16 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 DS2250-32-16 reliable?
The price and inventory of DS2250-32-16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2250-32-16 is usually 5 days.
3.What payment methods are accepted for DS2250-32-16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2250-32-16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2250-32-16?
DS2250-32-16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2250-32-16 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 DS2250-32-16?
For technical support, including DS2250-32-16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2250-32-16 requirements.
6.How does Aetrix verify that DS2250-32-16 is sourced from the original manufacturer or authorized distributors?
All DS2250-32-16 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 DS2250-32-16 meets industry standards.
7.What is the process for return or replacement of DS2250-32-16?
All DS2250-32-16 units undergo pre-shipment inspection (PSI). If there is an issue with DS2250-32-16, 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 DS2250-32-16 part is unused and in its original packaging.
Return procedure for DS2250-32-16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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