Analog Devices Inc./Maxim Integrated DS5002FPM-16

Overview

DS5002FPM-16 from Maxim Integrated (now Analog Devices) is an 8051-compatible secure microprocessor with 128kB nonvolatile SRAM, on-chip 64-bit encryption engine, self-destruct input (SDI), and lithium-backed power-fail protection. It operates at up to 16MHz, supports in-system programming via serial port, and maintains memory integrity for >10 years without external power - deployed in tamper-resistant financial terminals and secure authentication modules.

For engineers reviewing the DS5002FPM-16 datasheet, DS5002FPM-16 pinout, DS5002FPM-16 application, or DS5002FPM-16 equivalent, key selection considerations include lithium-backed NV SRAM retention, SDI-triggered key erasure, encrypted bus operation, 80 QFP package compatibility, and crash-proof reset behavior under brownout conditions.

Technical Context

The DS5002FPM-16 implements real-time address and data encryption using a protected 64-bit key loaded by an on-chip true random-number generator. Its byte-wide bus (BA14–BA0 + BD7–BD0) accesses external SRAM while presenting scrambled physical addresses and encrypted data values - all transparent to software execution.

Security enforcement includes hardware-level SDI deglitching (tSPA ≥ 50µs at VCC = 0V), lithium-backed CE1/CE2/CE3/PE1/PE2 enabling persistent chip-select during power loss, and automatic key erasure upon SDI activation or security lock reset - ensuring no residual key exposure after tamper event.

Key Specifications

Pinout & Package

DS5002FPM-16 uses an 80-pin Quad Flat Package (QFP) with 0.65mm lead pitch, compliant with JEDEC MS-026. The package provides full access to 8-bit bidirectional data bus (BD7–BD0), 15-bit nonmultiplexed address bus (BA14–BA0), four lithium-backed chip enables (CE1–CE4), two lithium-backed peripheral enables (PE1–PE2), and dedicated security pins including SDI and VRST.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS5002FMN-16, DS5002FPM-16 trades extended temperature rating for lower cost and commercial qualification; compared with MAX32550, it sacrifices ARM ecosystem compatibility and advanced crypto algorithms for deterministic physical security, SDI-driven key destruction, and guaranteed 10-year lithium-backed data retention without software intervention.

Availability

DS5002FPM-16 is available at Aetrix Electronics and suitable for financial terminal manufacturing, secure identity credentialing, and industrial control system development requiring stable component supply and long-term lifecycle assurance.

Supply support for DS5002FPM-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 (acquired by Analog Devices in 2021) designs high-reliability analog and mixed-signal ICs for security, power, and sensing applications.

The DS5002FPM-16 belongs to Maxim's secure microprocessor family, engineered specifically for applications demanding physical tamper resistance, cryptographic key protection, and battery-backed nonvolatile memory retention without external supervision.

FAQ

What is the primary security mechanism used by the DS5002FPM-16 to protect stored firmware?

The DS5002FPM-16 protects firmware using real-time hardware encryption of both address and data buses. All program and data stored in its 128kB external SRAM is encrypted using a 64-bit key generated by an on-chip true random-number generator. Logical addresses are translated to scrambled physical addresses, and each data byte is encrypted based on its location and key - making bus snooping ineffective. This encryption is active during both loading and execution, and the key is erased immediately upon SDI activation or security lock reset.

Does the DS5002FPM-16 require an external crystal, or can it use an external clock source?

The DS5002FPM-16 supports both configurations: it can drive a quartz crystal between XTAL1 and XTAL2 (1.0–16MHz), or accept an external CMOS clock signal applied to XTAL1 with XTAL2 left unconnected. AC timing specifications confirm valid operation with external clock high/low times ≥15ns at 16MHz, and rise/fall times ≤15ns - enabling direct connection to precision clock generators or FPGA outputs without additional buffering.

How does the DS5002FPM-16 maintain memory integrity during power loss?

The DS5002FPM-16 maintains memory integrity during power loss via lithium-backed circuitry tied to the VLI pin. When VCC drops below VLI (typically 3.0V), internal switches route power from the lithium cell to VCCO, CE1–CE4, PE1–PE2, and VRST/PF outputs. This preserves SRAM contents, chip-enable states, and reset signaling for over 10 years at room temperature. The PF pin asserts low to isolate non-battery-backed peripherals, while VRST guarantees a clean reset signal even at VCC = 0V.

What is the function of the MSEL pin on the DS5002FPM-16, and how does it affect memory configuration?

The MSEL pin on the DS5002FPM-16 selects between two memory architectures: when pulled to VCC (5V), the device expects four 32kB SRAM chips addressed via CE1–CE4; when grounded, it configures for a single 128kB SRAM where CE2 and CE3 become address lines A16 and A15. This pin must be hardwired - floating or incorrect bias causes undefined memory mapping and boot failure. The DS5002FPM-16 datasheet specifies that MSEL state is sampled at power-up and latched for the duration of operation.

Can the DS5002FPM-16 be programmed in-circuit, and what interface is used?

Yes, the DS5002FPM-16 supports in-system programming via its on-chip UART interface (P3.0/RXD and P3.1/TXD). Programming is initiated by asserting the PROG pin low at power-up or issuing the "Z" command to clear the security lock, then using the "L" command to load encrypted firmware through the serial port. The bootstrap loader handles encryption transparently - no external encryptor is needed. The process requires only 5V power, ground, and the two UART signals; no JTAG or SWD interface is present.