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Analog Devices Inc./Maxim Integrated DS2250-64-16#
- Part No.:
- DS2250-64-16#
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 40-SIMM
- Datasheet:
-
DS2250-64-16#.pdf
- Description:
- IC MCU 8BIT 64KB NVSRAM 40SIMM
- Quantity:
- Payment:
- Shipping:
Inventory:2,357
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Product details
Overview
DS2250-64-16# from Maxim Integrated is an 8-bit 8051-compatible soft microcontroller module featuring 64kB of nonvolatile CMOS SRAM for program and data storage, 16MHz maximum crystal speed, and 32 parallel I/O lines. It supports in-system serial bootstrap loading, self-modifying code execution, and power-fail reset/interrupt - deployed in secure metering, industrial control, and tamper-resistant embedded systems requiring persistent memory retention without backup power.
For engineers reviewing the DS2250-64-16# datasheet, DS2250-64-16# pinout, DS2250-64-16# application, or DS2250-64-16# equivalent, key selection considerations include nonvolatile RAM endurance (10 years at room temperature), RoHS-compliant lead-exempt packaging, 8051 instruction set compatibility, and absence of integrated real-time clock (RTC) in this variant.
Technical Context
The DS2250-64-16# implements a fully 8051-compatible CPU core with on-chip nonvolatile SRAM mapped across separate 64kB program and 64kB data address spaces. Its memory architecture allows dynamic partitioning of the 64kB NV RAM between program and data use via MCON register configuration.
It supports two programming modes: serial ASCII-based bootstrap loading at 300–9600 bps over UART (P3.0/P3.1), and parallel programming compatible with 87C51H timing. The device lacks internal RTC circuitry - confirmed by ordering table designation "No" under TIMEKEEPING? for DS2250-64-16#.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8051-compatible 8-bit CPU with object-code compatibility for existing 8051 toolchains |
| Nonvolatile Memory | 64kB CMOS SRAM retains full contents >10 years at 25°C without VCC |
| Max Clock Speed | 16MHz crystal oscillator support; AC timing validated up to 16MHz |
| I/O Lines | 32 general-purpose bidirectional I/O lines across Ports 0–3 |
| Serial Interface | Full-duplex UART (P3.0/RXD, P3.1/TXD) supporting bootstrap loading at multiple baud rates |
| Power Management | Power-fail reset and early-warning interrupt; stop mode current = 80µA |
| Operating Temp | 0°C to +70°C industrial temperature range per DC/AC specifications |
Pinout & Package
DS2250-64-16# uses a 40-pin SIMM (Single In-line Memory Module) package with 2.65" × 2.385" footprint and 0.050" pin pitch. Pin 2 = VCC (+5V), Pin 39 = GND, and all port pins are assigned per standard 8051 mapping with expanded bus functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,3,5,7,9,11,13,15 | P1.0–P1.7 | General-purpose I/O port; no alternate functions; open-drain not required |
| 17 | RST | Active-high reset input; internally pulled down; no external RC reset needed |
| 19,21 | P3.0/RXD, P3.1/TXD | UART serial interface; requires level-shifting for RS232 connection |
| 23,25 | P3.2/INT0, P3.3/INT1 | Active-low external interrupt inputs; edge-triggered |
| 27,29 | P3.4/T0, P3.5/T1 | Timer/counter external clock inputs; TTL-compatible |
| 31,33 | P3.6/WR, P3.7/RD | Expanded bus write/read strobes; used only in external memory mode |
| 35,37 | XTAL1, XTAL2 | Crystal oscillator connections; XTAL1 = inverter input, XTAL2 = output |
| 4,6,8,10,12,14,16,18 | P0.0–P0.7 | Open-drain I/O port; requires external pull-ups; multiplexed address/data bus in expanded mode |
| 20 | EA | External access control; must be tied to +5V to enable internal NV RAM |
| 22 | ALE | Address latch enable; de-multiplexes P0 in expanded bus mode; doubles as PROG during parallel programming |
| 24 | PSEN | Program store enable; active-low output for external code memory; used to trigger bootstrap loader |
| 26,28,30,32,34,36,38,40 | P2.7–P2.0 | General-purpose I/O; upper address byte in expanded bus mode |
Key Features
| Feature | Design Value |
|---|---|
| Self-Modifying Code Execution | Enables runtime firmware updates and adaptive logic without external reprogramming hardware |
| Encrypted Software Support | Hardware-assisted execution of encrypted code prevents reverse engineering of application binaries |
| Power-Fail Early Warning | Detects brown-out conditions before VCC drops below 4.15V, allowing safe state save to NV RAM |
| Watchdog Timer | Prevents system lock-up by forcing reset if software fails to service timer within timeout window |
| Serial Bootstrap Loader | Eliminates need for dedicated programmers; enables final-stage firmware loading via RS232 interface |
Applications
| Smart Energy Metering | Industrial PLC I/O Module |
|---|---|
Use Scenario: Tamper-proof electricity meter storing billing history and tariff schedules across power outages. IC Role / Device Role / Timing Role: Primary controller managing sensor interfaces, EEPROM emulation, and secure data logging using nonvolatile SRAM. Use Value: Guarantees 10-year data retention without battery or supercapacitor backup, reducing BOM cost and field failure risk. | Use Scenario: Distributed I/O node in factory automation collecting analog/digital signals and executing local control logic. IC Role / Device Role / Timing Role: Standalone programmable controller handling real-time I/O scanning and deterministic loop execution. Use Value: Enables field-upgradable firmware via serial port while maintaining operational continuity during power interruptions. |
| Secure Access Control Panel | Medical Device Configuration Module |
Use Scenario: Door controller storing biometric templates and access logs in environments with frequent power cycling. IC Role / Device Role / Timing Role: Secure host processor executing encrypted authentication algorithms and managing flashless configuration storage. Use Value: Prevents unauthorized firmware extraction and ensures audit trail integrity even after extended power loss. | Use Scenario: Calibration and parameter storage module inside portable diagnostic equipment requiring regulatory traceability. IC Role / Device Role / Timing Role: Trusted configuration manager preserving device-specific calibration constants and usage counters. Use Value: Meets IEC 62304 requirements for persistent, uncorrupted configuration data across device lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar soft microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2250T-64-16 | Includes permanently powered real-time clock (RTC); same 64kB NV RAM and 16MHz speed | Required where timestamped event logging or scheduled wake-up is essential | Select DS2250T-64-16 only if RTC functionality is mandatory; otherwise DS2250-64-16# reduces cost and complexity |
| DS2250-32-16# | Halves NV RAM capacity to 32kB; identical pinout, timing, and feature set | Suitable for simpler firmware with smaller memory footprint and lower cost target | Choose DS2250-32-16# when application code+data fits within 32kB and budget constraints apply |
Compared with DS2250T-64-16, DS2250-64-16# removes RTC circuitry to reduce power and cost while retaining full nonvolatile program/data execution capability; versus DS2250-32-16#, it doubles available NV RAM for larger firmware or data buffers without changing PCB layout or software architecture.
Availability
DS2250-64-16# is available at Aetrix Electronics and suitable for smart metering, industrial control, and secure access systems requiring stable component supply, long-term data retention, and RoHS-compliant manufacturing.
Supply support for DS2250-64-16# 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 high-reliability analog and mixed-signal ICs for industrial, automotive, and communications markets.
The DS2250(T) product line delivers secure, nonvolatile microcontrollers optimized for applications demanding data persistence, firmware protection, and in-field programmability without external memory or batteries.
FAQ
Does DS2250-64-16# include an integrated real-time clock (RTC)?
No, DS2250-64-16# does not include an RTC. The ordering table explicitly lists "No" under TIMEKEEPING? for this variant. RTC functionality is only present in DS2250T-xx-xx parts. DS2250-64-16# relies on external timekeeping solutions if timestamping is required.
What is the meaning of the "#" suffix in DS2250-64-16#?
The "#" suffix indicates a RoHS-compliant device that may contain lead exempt under RoHS Directive Annex III exemptions - specifically for high-melting-temperature solder alloys used in SIMM module assembly. DS2250-64-16# meets EU RoHS requirements while maintaining mechanical and thermal reliability of the 40-pin SIMM package.
Can DS2250-64-16# execute code directly from its nonvolatile RAM?
Yes, DS2250-64-16# executes code directly from its 64kB nonvolatile SRAM. When EA is tied high, the device uses internal memory for both program and data space, eliminating need for external ROM or Flash. This enables true "soft" microcontroller behavior with field-upgradable firmware.
What programming interfaces does DS2250-64-16# support?
DS2250-64-16# supports two programming interfaces: (1) Serial bootstrap loading via UART (P3.0/P3.1) at 300–9600 bps using Intel Hex format, and (2) Parallel programming compatible with 87C51H timing using P0/P2 address/data bus and control signals (RST, PSEN, PROG, EA). Both methods write directly to NV RAM.
Is DS2250-64-16# pin-compatible with other DS2250(T) variants?
Yes, DS2250-64-16# shares identical 40-pin SIMM pinout and electrical characteristics with all DS2250(T) family members including DS2250-32-16#, DS2250T-64-16, and DS2250T-32-16+. Differences are limited to memory size and RTC presence - no PCB redesign is needed when substituting within the same package option.
DS2250-64-16# Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 40-SIMM
- Series:
- DS225x
- Packaging:
- Bulk
- 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:
- 64KB (64K 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:
DS2250-64-16# FAQ
1.How can I place an order for DS2250-64-16# through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2250-64-16# 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 DS2250-64-16# reliable?
The price and inventory of DS2250-64-16# are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2250-64-16# is usually 5 days.
3.What payment methods are accepted for DS2250-64-16#?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2250-64-16# transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2250-64-16#?
DS2250-64-16# orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2250-64-16# 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 DS2250-64-16#?
For technical support, including DS2250-64-16# datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2250-64-16# requirements.
6.How does Aetrix verify that DS2250-64-16# is sourced from the original manufacturer or authorized distributors?
All DS2250-64-16# 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 DS2250-64-16# meets industry standards.
7.What is the process for return or replacement of DS2250-64-16#?
All DS2250-64-16# units undergo pre-shipment inspection (PSI). If there is an issue with DS2250-64-16#, 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 DS2250-64-16# part is unused and in its original packaging.
Return procedure for DS2250-64-16#:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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