Analog Devices Inc./Maxim Integrated DS5001FP-16N+

Overview

DS5001FP-16N+ from Maxim Integrated is an 8051-compatible nonvolatile SRAM-based microprocessor with 128kB NV RAM, 16MHz max clock, 32 I/O pins, on-chip serial port, and lithium-backed power-fail protection. It executes full 8051 instruction set and supports in-system reprogramming for adaptive firmware in data loggers and secure embedded controllers.

For engineers reviewing the DS5001FP-16N+ datasheet, DS5001FP-16N+ pinout, DS5001FP-16N+ application, or DS5001FP-16N+ equivalent, key selection criteria include industrial temperature range (–40°C to +85°C), battery-backed chip enables (CE1–CE4, PE1–PE2), byte-wide address/data bus (BA14–0 / BD7–0), and power-fail interrupt/reset behavior at VPFW = 4.1–4.6V and VCCMIN = 3.85–4.25V.

Technical Context

The DS5001FP-16N+ implements a nonmultiplexed byte-wide memory interface with dedicated BA14–0 and BD7–0 buses, eliminating I/O pin contention and enabling full 32-pin parallel port availability. It integrates lithium-backed logic for CE1–CE4, PE1–PE2, R/W, and VRST, preserving memory state and peripheral control during VCC dropout.

Its architecture supports dynamic memory partitioning via SFR-controlled PM and PES bits, allowing up to 252kB total accessible data space through bank switching across four 64kB regions - primary data (0000h–FFFFh), peripheral-mapped (PES=1), expanded bus (ports 0/2), and program-to-data remapping (up to 60kB).

Key Specifications

Pinout & Package

DS5001FP-16N+ uses an 80-pin MQFP package (24.0mm × 18.0mm body, 0.8mm pitch). The device features dual independent buses: a nonmultiplexed byte-wide address/data interface (BA14–0 / BD7–0) and a standard 8051 expanded bus (ports 0/2 with ALE/PSEN).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS5001FP-16+ and DS5002FP-16N+, the DS5001FP-16N+ uniquely balances industrial temperature operation, lithium-backed memory persistence, and field-programmable flexibility without added security overhead - making it optimal for cost-sensitive, high-reliability data acquisition systems.

Availability

DS5001FP-16N+ is available at Aetrix Electronics and suitable for industrial data loggers, secure embedded controllers, real-time clock integration, and adaptive firmware platforms requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for DS5001FP-16N+ 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 processing solutions for industrial, automotive, and communications markets.

The DS5001FP-16N+ belongs to Maxim's secure microcontroller family, engineered specifically for applications demanding nonvolatile program/data storage, power-fail resilience, and in-field firmware adaptability without external memory or supervisory ICs.

FAQ

What is the maximum operating frequency of the DS5001FP-16N+?

The DS5001FP-16N+ supports a maximum clock speed of 16MHz, as confirmed by the ordering information table and AC timing specifications. This rating applies across its full industrial temperature range (–40°C to +85°C) and is validated under VCC = 5V ±10%. The device achieves this performance using an internal oscillator driven by an external crystal (XTAL1/XTAL2) or external clock source, with startup time specified in the datasheet.

How does the DS5001FP-16N+ handle power failure events?

The DS5001FP-16N+ implements a three-tiered power-fail response: first, a power-fail warning interrupt triggers at VPFW (4.1–4.6V); second, a hardware reset activates at VCCMIN (3.85–4.25V); third, lithium switchover occurs below VLI (2.5–4.0V), powering VCCO and lithium-backed logic. VRST and PF pins provide deterministic signaling of each stage, and all critical chip enables (CE1–CE4, PE1–PE2) remain asserted during backup to preserve memory and peripheral state.

Can the DS5001FP-16N+ execute standard 8051 assembly code without modification?

Yes, the DS5001FP-16N+ is fully object-code compatible with the industry-standard 8051 instruction set, including all 111 instructions, addressing modes, and SFR mappings. As stated in the Instruction Set section, existing 8051 assemblers and compilers produce executable code for DS5001FP-16N+ without source changes. Peripheral registers (timers, serial port, I/O ports) behave identically, and memory organization supports standard 8051 code layout.

What memory configurations does the DS5001FP-16N+ support via the MSEL pin?

The MSEL pin configures the DS5001FP-16N+ for two distinct SRAM topologies: when MSEL = VCC, the device expects four 32k x 8 SRAMs (total 128kB) with CE1–CE4 selecting individual banks; when MSEL = GND, it drives CE2 and CE3 as A16 and A15 respectively to interface with a single 128k x 8 SRAM. This hardware-selectable mode eliminates software configuration overhead and ensures correct bus timing for either architecture.

Is external pull-up resistance required on DS5001FP-16N+ Port 0 pins?

Yes, Port 0 (P0.0–P0.7) is open-drain and requires external pull-up resistors when used as general-purpose I/O. The datasheet explicitly states Port 0 "cannot drive a logic 1" and "requires external pullups." Pull-ups are unnecessary only when Port 0 operates in expanded bus mode (multiplexed AD0–AD7), where internal drivers assert during address/data phases. Typical values range from 4.7kΩ to 10kΩ, depending on bus capacitance and rise-time requirements.