Analog Devices Inc./Maxim Integrated DS5250F-1N5+

Overview

DS5250F-1N5+ from Maxim Integrated is a secure, 8051-compatible microcontroller with four clocks-per-machine-cycle architecture, 25MHz max operating frequency, hardware-accelerated single/3DES encryption engine, and tamper-detecting security features. It executes encrypted program memory, integrates a 4096-bit modulo-arithmetic accelerator (MAA), and targets PIN pads and financial terminals requiring FIPS-level data protection.

For engineers reviewing the DS5250F-1N5+ datasheet, DS5250F-1N5+ pinout, DS5250F-1N5+ application, or DS5250F-1N5+ equivalent, key selection criteria include industrial temperature range (–40°C to +85°C), 100-pin MQFP RoHS-compliant package, on-chip RTC with alarm, battery-backed SRAM, and dual data pointer support for high-speed memory access in secure embedded systems.

Technical Context

The DS5250F-1N5+ implements a hardened 8051 core with instruction cache (1KB), dual independent data pointers, and programmable MOVX timing-enabling single-cycle execution at 160ns. Its memory management unit supports partitionable nonvolatile segments (4KB–256KB) and enforces cryptographic separation of program and data memory.

Security architecture includes two self-destruct inputs, thermal/voltage/probe tamper sensors, programmable countermeasures, and a true random-number generator. The integrated MAA accelerates RSA/ECC operations, while CRC-16/32 logic supports integrity verification of firmware and communication payloads.

Key Specifications

Pinout & Package

DS5250F-1N5+ is housed in a 100-pin MQFP (Metric Quad Flat Package) with 0.5mm lead pitch, RoHS-compliant and lead-free. Pin functions align with Maxim's DS5250 family pinout specification for 100-pin variants, supporting byte-wide bus interface, four 8-bit I/O ports (P0–P3), one 6-bit port (P4), and dedicated security/tamper/RTC/power control signals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar secure microcontroller applications.

Compared with DS5250F-1N5 and MAX32590, the DS5250F-1N5+ uniquely combines 8051 firmware continuity, hardware DES/3DES acceleration, and FIPS-grade tamper response-making it irreplaceable for maintaining certified financial terminal designs without architectural redesign.

Availability

DS5250F-1N5+ is available at Aetrix Electronics and suitable for PIN pad manufacturing, EMV terminal production, and government ID personalization systems requiring stable component supply across extended product lifecycles.

Supply support for DS5250F-1N5+ 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-performance analog, mixed-signal, and secure ICs for industrial, automotive, and computing applications.

The DS5250F-1N5+ belongs to Maxim's secure microcontroller product line, engineered specifically for payment-grade cryptographic processing, tamper-resilient data storage, and regulatory-compliant embedded security in financial and identity infrastructure.

FAQ

What is the operating temperature range for DS5250F-1N5+?

The DS5250F-1N5+ is rated for industrial operation from –40°C to +85°C. This range is validated across all internal peripherals-including the real-time clock, DES engine, and tamper sensors-and ensures reliable cryptographic execution under environmental stress typical in uncontrolled retail or outdoor kiosk deployments. DS5250F-1N5+ maintains full specification compliance across this range without derating.

Does DS5250F-1N5+ support in-system programming via serial interface?

Yes, DS5250F-1N5+ supports in-system programming (ISP) through its UART serial port without requiring external high-voltage programming signals. The device boots into secure-loader mode upon reset and accepts encrypted firmware images over UART, verifying digital signatures before writing to nonvolatile memory. DS5250F-1N5+ retains this capability across all temperature grades and packaging variants.

How does the DS5250F-1N5+ enforce program memory integrity?

The DS5250F-1N5+ performs automatic checksum and cryptographic integrity checks on program memory during boot and on-demand execution. It uses hardware-assisted CRC-32 and encrypted memory segment validation to detect corruption or unauthorized modification. If integrity failure is detected, DS5250F-1N5+ halts execution and triggers a secure erase sequence-ensuring no compromised code ever runs.

What is the purpose of the SDI1 and SDI2 pins on DS5250F-1N5+?

SDI1 and SDI2 are dedicated self-destruct inputs on DS5250F-1N5+ that initiate immediate, irreversible erasure of all sensitive memory (program, data, keys) when driven high under tamper conditions. These pins interface directly with external tamper-detection circuits (e.g., mesh sensors, voltage monitors) and are electrically isolated from general I/O to prevent false triggering. DS5250F-1N5+ requires both pins to be asserted simultaneously for certain countermeasure levels.

Is an evaluation kit available for DS5250F-1N5+?

Yes-an official evaluation kit (DS5250-KIT) is available for DS5250F-1N5+, providing hardware platform, preloaded firmware examples, secure bootloader tools, and documentation for rapid prototyping of PIN pad and financial terminal applications. While the kit supports multiple DS5250 variants, DS5250F-1N5+ is fully compatible and operates identically in the kit's 100-pin socket. DS5250F-1N5+ users receive full technical support and reference schematics from Maxim's secure MCU design resources.