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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

Analog Devices Inc./Maxim Integrated DS2250T-64-16+

Name: DS2250T-64-16+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS2250T-64-16+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS2250T-64-16+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Microcontrollers

Package:: 40-SIMM

Datasheet:: DS2250T-64-16+.pdf

Description:: IC MCU 8BIT 64KB NVSRAM 40SIMM

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Product details

Overview

DS2250T-64-16+ from Maxim Integrated is an 8-bit 8051-compatible soft microcontroller module with 64kB nonvolatile SRAM, 16MHz crystal support, permanently powered real-time clock (RTC), and RoHS-compliant 40-pin SIMM package. It retains full program/data memory, configuration registers, and RTC state for over 10 years without VCC, enabling secure, maintenance-free operation in battery-backed or infrequently powered systems such as utility meters and industrial data loggers.

For engineers reviewing the DS2250T-64-16+ datasheet, DS2250T-64-16+ pinout, DS2250T-64-16+ application, or DS2250T-64-16+ equivalent, key selection criteria include nonvolatile RAM size, RTC integration, power-fail interrupt capability, serial bootstrap loader support, and compatibility with standard 8051 development tools and Intel Hex programming workflows.

Technical Context

The DS2250T-64-16+ implements a fully 8051-object-code-compatible CPU core with dual memory spaces: up to 64kB addressable program memory and 64kB data memory, both accessible via MOVX instructions. Its nonvolatile SRAM is retained using internal charge-pump circuitry and backup power routing, eliminating external battery or supercapacitor dependency for data retention.

Real-time clock functionality is accessed through an alternate memory-mapped region enabled by SFR bit MCON.2 (ECE2); the RTC operates independently using an on-board crystal and maintains time to 0.01-second resolution. Serial communication uses a full-duplex UART with configurable baud rates (300–57.6k bps) tied to crystal frequency per Table 2, and supports ASCII-based command-line bootstrap loading without external programmer hardware.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	8051-compatible 8-bit CPU with object-code compatibility for existing cross-assemblers and C compilers
Nonvolatile Memory	64kB CMOS SRAM retaining program/data/config/RTC for ≥10 years at 25°C without VCC
Max Clock Speed	16MHz crystal oscillator; supports external clock drive with min 15ns high/low times
RTC Accuracy	Timekeeping to hundredth of a second using integrated crystal; no external timing source required
Power-Fail Response	Dedicated early-warning interrupt (VCC < 4.15V) and automatic power-fail reset
Serial Interface	Full-duplex UART supporting Bootstrap Loader via RS-232C 3-wire interface (RXD/TXD/GND)
Operating Temp	0°C to +70°C; validated across full range for DC/AC timing specs including expanded bus read/write cycles

Pinout & Package

DS2250T-64-16+ uses a 40-pin SIMM (Single In-line Memory Module) package with 2.65" × 0.85" footprint and 0.05" pin pitch. Pin 2 is VCC (+5V), pin 39 is GND, and pins 35/37 connect to XTAL1/XTAL2 for crystal oscillator interface.

Pin/Terminal	Circuit Role	Design Meaning
1,3,5,7,9,11,13,15	P1.0–P1.7	General-purpose I/O port with internal pull-downs; no external pullups needed
17	RST	Active-high reset input; internally pulled down; no external RC network required
19,21	RXD/TXD	UART serial I/O; requires level-shifting for direct PC COM port connection
23,25	INT0/INT1	Active-low external interrupt inputs with Schmitt-trigger inputs
27,29	T0/T1	Timer/counter external event inputs; compatible with 8051 timer capture modes
31,33	WR/RD	Expanded bus strobes for external memory access; active-low, TTL-compatible
35,37	XTAL1/XTAL2	Crystal oscillator connections; XTAL1 is inverter input, XTAL2 is output
4,6,8,10,12,14,16,18	P0.0–P0.7	Open-drain I/O port; requires external pullups unless used as multiplexed address/data bus
26,28,30,32,34,36,38,40	P2.7–P2.0	General-purpose I/O; also serves as MSB of expanded address bus (A8–A15)

Key Features

Feature	Design Value
Self-Modifying Code Support	Enables runtime firmware updates and field-programmable logic without external reprogramming hardware
Encrypted Software Execution	Prevents unauthorized disclosure of application code via 40-bit encryption key loading and security lock activation
Watchdog Timer & Power Monitoring	Guarantees system recovery from software hangs and detects brown-out conditions before data corruption occurs
Parallel Programming Compatibility	Timing-set compatible with 87C51H; supports in-system programming via standard 8051-style parallel load cycles
Memory-Mapped RTC Access	RTC registers appear in alternate data space when MCON.2 = 1, enabling direct MOVX reads/writes without dedicated I²C/SPI interface

Applications

Smart Utility Metering	Industrial Data Logger
Use Scenario: Long-term energy consumption recording in electric/gas/water meters with infrequent wake-up cycles and no battery replacement. IC Role / Device Role / Timing Role: Primary controller managing sensor sampling, secure data storage, tamper detection, and RTC-synchronized timestamping of usage events. Use Value: 10-year nonvolatile memory retention eliminates battery dependency; integrated RTC ensures accurate billing intervals without external timing components.	Use Scenario: Autonomous environmental monitoring in remote locations where field servicing is costly and power availability is intermittent. IC Role / Device Role / Timing Role: Standalone data acquisition node performing scheduled sensor reads, encrypted local storage, and periodic wireless upload triggers. Use Value: Power-fail interrupt and stop-mode current (80µA) enable graceful shutdown and resume; self-modifying code allows over-the-air firmware patching.
Secure Access Control System	Medical Device Event Recorder
Use Scenario: Tamper-resistant door controllers storing biometric templates, access logs, and audit trails in environments requiring regulatory compliance (e.g., HIPAA, PCI). IC Role / Device Role / Timing Role: Trusted execution environment enforcing cryptographic authentication, secure boot, and time-stamped event logging with write-protection. Use Value: Encrypted software execution prevents reverse engineering; nonvolatile SRAM ensures log integrity during power loss or physical intrusion attempts.	Use Scenario: Implantable or wearable diagnostic devices capturing physiological waveforms and annotating critical events with precise timestamps. IC Role / Device Role / Timing Role: Real-time signal processor and secure storage manager synchronizing ADC sampling, event flagging, and RTC-tagged metadata generation. Use Value: Hundredth-of-a-second RTC resolution enables clinical-grade timing accuracy; 64kB NV RAM stores extended waveform buffers without external flash.

Smart Utility Metering

Industrial Data Logger

Use Scenario: Long-term energy consumption recording in electric/gas/water meters with infrequent wake-up cycles and no battery replacement.

IC Role / Device Role / Timing Role: Primary controller managing sensor sampling, secure data storage, tamper detection, and RTC-synchronized timestamping of usage events.

Use Value: 10-year nonvolatile memory retention eliminates battery dependency; integrated RTC ensures accurate billing intervals without external timing components.

Use Scenario: Autonomous environmental monitoring in remote locations where field servicing is costly and power availability is intermittent.

IC Role / Device Role / Timing Role: Standalone data acquisition node performing scheduled sensor reads, encrypted local storage, and periodic wireless upload triggers.

Use Value: Power-fail interrupt and stop-mode current (80µA) enable graceful shutdown and resume; self-modifying code allows over-the-air firmware patching.

Secure Access Control System

Medical Device Event Recorder

Use Scenario: Tamper-resistant door controllers storing biometric templates, access logs, and audit trails in environments requiring regulatory compliance (e.g., HIPAA, PCI).

IC Role / Device Role / Timing Role: Trusted execution environment enforcing cryptographic authentication, secure boot, and time-stamped event logging with write-protection.

Use Value: Encrypted software execution prevents reverse engineering; nonvolatile SRAM ensures log integrity during power loss or physical intrusion attempts.

Use Scenario: Implantable or wearable diagnostic devices capturing physiological waveforms and annotating critical events with precise timestamps.

IC Role / Device Role / Timing Role: Real-time signal processor and secure storage manager synchronizing ADC sampling, event flagging, and RTC-tagged metadata generation.

Use Value: Hundredth-of-a-second RTC resolution enables clinical-grade timing accuracy; 64kB NV RAM stores extended waveform buffers without external flash.

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+	32kB nonvolatile SRAM instead of 64kB; identical RTC, pinout, instruction set, and bootloader	Suitable for applications with smaller firmware footprints and lower data logging depth requirements	Select when memory budget permits reduction and cost optimization is prioritized over future firmware scalability
DS2250-64-16+	No integrated real-time clock; otherwise identical memory, speed, packaging, and feature set	Applicable where timekeeping is handled externally or unnecessary, reducing BOM count and power overhead	Choose when RTC functionality is redundant and system-level timing is managed by host processor or external module

Compared with DS2250T-32-16+, DS2250T-64-16+ doubles embedded nonvolatile storage for larger firmware or extended data buffering, while maintaining identical RTC, security, and bootloader capabilities; compared with DS2250-64-16+, it adds permanent timekeeping without increasing pin count or altering layout, making it optimal for timestamp-critical autonomous systems.

Availability

DS2250T-64-16+ is available at Aetrix Electronics and suitable for smart metering, industrial data logging, secure access control, medical event recording, and battery-constrained embedded applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for DS2250T-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 precision analog, mixed-signal, and embedded security ICs for industrial, automotive, communications, and computing markets.

The DS2250(T) product line delivers "soft" microcontrollers optimized for secure, maintenance-free operation in infrastructure and safety-critical systems where nonvolatile program/data retention, tamper resistance, and autonomous timekeeping are essential.

FAQ

What distinguishes DS2250T-64-16+ from standard 8051 microcontrollers?

The DS2250T-64-16+ integrates 64kB of nonvolatile SRAM that retains program code, data, configuration registers, and RTC state for over 10 years without power-unlike conventional 8051s requiring external EEPROM/flash and battery-backed RTC. It also features built-in power-fail interrupt, encrypted software execution, and a serial bootstrap loader eliminating need for external programmers. These capabilities make DS2250T-64-16+ uniquely suited for unattended, security-sensitive deployments where field maintenance is impractical.

Does DS2250T-64-16+ require an external crystal to operate its real-time clock?

Yes, DS2250T-64-16+ requires an external crystal connected to XTAL1 and XTAL2 pins to operate its permanently powered real-time clock. The datasheet specifies use of an on-board crystal for hundredth-of-a-second timekeeping, and Figure 3 shows a typical 11.0592MHz crystal configuration. No internal RC oscillator is provided for RTC; crystal start-up time is documented as tCSU in AC Characteristics, and crystal vendor specifications must be consulted for worst-case timing.

Can DS2250T-64-16+ execute code directly from its nonvolatile SRAM?

Yes, DS2250T-64-16+ executes code directly from its 64kB nonvolatile SRAM without requiring external memory mapping or shadowing. The device supports full 64kB program memory addressing via the standard 8051 instruction fetch mechanism, and the EA pin must be tied to +5V to enable internal memory access. This architecture allows immediate execution after power-up and supports runtime self-modification of both program and data memory-key to its "soft microcontroller" designation.

How is firmware loaded into DS2250T-64-16+ during production or field update?

Firmware is loaded into DS2250T-64-16+ via two supported methods: serial bootstrap loader (using RXD/TXD at 300–57.6k bps) or parallel programming (timing-compatible with 87C51H). The serial loader accepts Intel Hex files over a 3-wire RS-232 interface and provides command-line functions (L, V, C, etc.) for load, verify, and checksum. Parallel loading uses PROG strobes and VPP voltage on EA pin, with expanded cycles supporting up to 32kB. Both methods are documented in the Secure Microcontroller User's Guide.

Is DS2250T-64-16+ pin-compatible with other DS2250(T) variants?

Yes, DS2250T-64-16+ is pin-compatible with all DS2250(T) family members including DS2250T-32-16+, DS2250-64-16+, and DS2250-32-16+, sharing the same 40-pin SIMM package, pinout, and electrical interface. Differences are limited to internal memory size (32kB vs. 64kB) and RTC inclusion (T-suffix denotes RTC), with identical timing, I/O structure, and register mapping. This allows drop-in replacement within the same package variant, simplifying design reuse and inventory management across product tiers.

DS2250T-64-16+ 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:: 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:

DS2250T-64-16+ FAQ

1.How can I place an order for DS2250T-64-16+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS2250T-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 DS2250T-64-16+ reliable?

The price and inventory of DS2250T-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 DS2250T-64-16+ is usually 5 days.

3.What payment methods are accepted for DS2250T-64-16+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2250T-64-16+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS2250T-64-16+?

DS2250T-64-16+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS2250T-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 DS2250T-64-16+?

For technical support, including DS2250T-64-16+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2250T-64-16+ requirements.

6.How does Aetrix verify that DS2250T-64-16+ is sourced from the original manufacturer or authorized distributors?

All DS2250T-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 DS2250T-64-16+ meets industry standards.

7.What is the process for return or replacement of DS2250T-64-16+?

All DS2250T-64-16+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2250T-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 DS2250T-64-16+ part is unused and in its original packaging.

Return procedure for DS2250T-64-16+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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