Analog Devices Inc./Maxim Integrated DS5002FP-16

Overview

DS5002FP-16 from Maxim Integrated (now Analog Devices) is an 8051-compatible secure microprocessor with 128kB nonvolatile SRAM, on-chip 64-bit encryption engine, and lithium-backed power-fail protection. It executes encrypted firmware in real time without performance penalty and supports self-destruct activation via SDI pin for tamper response. Used in high-security embedded systems requiring long-term data retention and anti-piracy protection.

For engineers reviewing the DS5002FP-16 datasheet, DS5002FP-16 pinout, DS5002FP-16 application, or DS5002FP-16 equivalent, key selection considerations include lithium-backed NV SRAM retention (>10 years), hardware-enforced encryption using on-chip true random key generation, crash-proof operation with early-warning power-fail interrupt, and secure boot via in-system programming through on-chip serial port.

Technical Context

The DS5002FP-16 implements a real-time address and data encryption/decryption pipeline synchronized to the 8051 core - logical addresses from PC or DPTR are encrypted before output on BA[14:0], and opcodes/data are decrypted on read or encrypted on write to BD[7:0]. Its security lock mechanism permanently protects the 64-bit key and Vector RAM; any tamper attempt triggers immediate erasure.

It operates in two power domains: VCC-driven normal mode and VLI-driven battery-backup mode, with automatic switchover when VCC drops below VLI (typically 3V). Critical outputs CE1–CE4, PE1–PE2, VRST, and PF remain active during backup, ensuring continuity of memory access and tamper signaling even at VCC = 0V.

Key Specifications

Pinout & Package

DS5002FP-16 is housed in an 80-pin Quad Flat Package (QFP) with 0.65 mm pitch and exposed thermal pad option. Pin numbering follows standard counter-clockwise layout from top-left corner (Pin 1 = P0.4/AD4).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS5002FPM-16+ and DS5002FMN-16, the DS5002FP-16 offers identical core security functionality and 80-QFP compatibility but lacks RoHS certification and extended temperature qualification - making it suitable for legacy commercial designs where those attributes are not mandated.

Availability

DS5002FP-16 is available at Aetrix Electronics and suitable for secure firmware execution, lithium-backed data logging, and tamper-responsive embedded control requiring stable component supply over multi-year production cycles.

Supply support for DS5002FP-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) is a leader in analog and mixed-signal ICs, specializing in power management, interface, sensing, and secure microcontrollers.

The DS5002FP-16 belongs to Maxim's secure microprocessor family designed for applications demanding cryptographic integrity, long-term nonvolatile storage without external EEPROM/Flash, and physical tamper resistance in resource-constrained environments.

FAQ

What is the maximum external SRAM capacity supported by DS5002FP-16?

The DS5002FP-16 supports up to 128kB of external CMOS SRAM via its byte-wide bus (BA[14:0] + BD[7:0]). When MSEL = 0V, CE2 and CE3 are remapped as A16 and A15, enabling full 128k × 8 addressing. The device encrypts all data and addresses in real time, and lithium backup ensures data retention for over 10 years without external power. DS5002FP-16 does not support larger capacities due to fixed 15-bit address bus width.

How does the DS5002FP-16 handle power failure events?

The DS5002FP-16 provides three-tiered power-fail response: (1) PF pin asserts low when VCC drops below VLI (3V nominal), signaling imminent backup mode entry; (2) early-warning interrupt triggers when VCC falls within 4.1–4.6V range; (3) power-fail reset activates at VCCMIN (3.85–4.25V). All critical outputs (CE1–CE4, PE1–PE2, VRST, PF) remain functional during lithium backup, ensuring uninterrupted SRAM access and tamper signaling. DS5002FP-16 guarantees this behavior even at VCC = 0V.

Can DS5002FP-16 execute unencrypted code?

No - the DS5002FP-16 enforces hardware-level encryption at all times. During boot, the bootstrap loader loads application code in scrambled form; during runtime, all logical addresses from the 8051 core are encrypted before appearing on BA[14:0], and all opcodes/data are decrypted on read or encrypted on write to BD[7:0]. There is no configuration bit or mode to disable encryption. This differs from DS5001FP, which is the non-secure base part. DS5002FP-16's security circuitry is always active and cannot be bypassed.

What happens when the SDI pin is asserted on DS5002FP-16?

Asserting SDI high (≥50 µs at VCC = 0V or ≥10 µs at VCC = 5V) triggers irreversible self-destruct: the 64-bit encryption key and 48-byte Vector RAM are erased, VCCO is disabled (cutting power to SRAM), and the security lock is reset. This occurs asynchronously and functions even with VCC = 0V, as SDI is monitored by lithium-backed logic. DS5002FP-16 does not recover from this state - the device must be reprogrammed via bootstrap loader after clearing the lock, and all prior encrypted data becomes unrecoverable.

Is DS5002FP-16 pin-compatible with DS5001FP?

Yes - the DS5002FP-16 is functionally and pin-compatible with the DS5001FP-16, sharing identical 80-QFP footprint, I/O structure, and bus timing. However, DS5002FP-16 adds security-specific pins (SDI, VRST, PF) and modifies behavior of CE1–CE4/PE1–PE4 to remain active during lithium backup. Firmware written for DS5001FP runs unmodified on DS5002FP-16, but gains encryption, tamper response, and crash-proof features automatically. DS5002FP-16 replaces DS5001FP in secure applications without PCB changes.