Analog Devices Inc./Maxim Integrated DS5000-32-16+

Overview

DS5000-32-16+ from Maxim Integrated is an 8-bit 8051-compatible microcontroller with 32 kB nonvolatile SRAM for program and data storage, 16 MHz maximum crystal frequency, and crashproof operation preserving memory for 10 years without V_CC at room temperature. It features on-chip serial I/O, two timer/event counters, 32 parallel I/O lines, and power-fail reset/interrupt - deployed in secure embedded systems requiring field-upgradable firmware and long-term data retention without backup battery.

For engineers reviewing the DS5000-32-16+ datasheet, DS5000-32-16+ pinout, DS5000-32-16+ application, or DS5000-32-16+ equivalent, key selection criteria include nonvolatile RAM size, 8051 instruction set compatibility, serial bootstrap loader support at multiple baud rates, power-fail warning threshold (4.15–4.75 V), and lead-free 40-pin PDIP package compliance.

Technical Context

The DS5000-32-16+ implements a CMOS 8051 core with full object-code compatibility, enabling reuse of existing 8051 toolchains. Its internal memory map supports up to 64 kB program and 64 kB data space, with the on-chip 32 kB NV SRAM configurable as either program or data memory via MCON register settings.

Crashproof operation relies on nonvolatile preservation of all registers and SRAM during V_CC loss, backed by early-warning power-fail interrupt (VPFW = 4.15–4.75 V) and hardware watchdog timer. Serial bootstrap loading operates at 300–9600 bps over UART using ASCII CR (0xD) detection, with no external programmer required.

Key Specifications

Pinout & Package

DS5000-32-16+ uses a 40-pin plastic dual in-line package (PDIP) with 0.600-inch width, compliant with JEDEC MS-001. Pin 1 is P1.0; pin 40 is V_CC; pin 20 is GND; pin 9 is active-high RST; pins 10/11 are UART RXD/TXD; pins 30/31/32 are ALE/PSEN/EA for expanded bus operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8051-compatible microcontroller applications.

Compared with DS5000T-32-16+, the DS5000-32-16+ removes RTC hardware to reduce cost and power, while retaining identical crashproof memory behavior and serial bootloader capability; versus DS89C450, it trades raw speed and flash density for guaranteed 10-year nonvolatile data retention without battery support.

Availability

DS5000-32-16+ is available at Aetrix Electronics and suitable for secure industrial controllers, field-upgradeable utility meters, embedded security modules, and legacy 8051 system replacements requiring stable component supply and long-lifecycle support.

Supply support for DS5000-32-16+ 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 processing solutions for industrial, automotive, and communications markets.

The DS5000(T) family delivers "soft microcontroller" functionality - combining 8051 compatibility with nonvolatile SRAM and crashproof operation for secure, field-programmable embedded systems.

FAQ

What is the primary function of the DS5000-32-16+ in an embedded system?

The DS5000-32-16+ serves as a secure, field-upgradeable 8-bit microcontroller with 32 kB nonvolatile SRAM. It executes 8051-compatible code, manages I/O, handles power-fail events, and hosts encrypted firmware - making it ideal for industrial controllers and utility meters where data integrity and remote updates are critical. The DS5000-32-16+ retains all memory contents for ≥10 years without power, eliminating battery dependency.

Does the DS5000-32-16+ support in-system programming, and how is it performed?

Yes, the DS5000-32-16+ supports in-system programming via its serial bootstrap loader. By asserting RST high and pulling PSEN low, the device enters loader mode and accepts Intel HEX files over UART at 300–9600 bps. No external programmer is needed - a simple RS-232 interface suffices. The DS5000-32-16+ also supports parallel programming using VPP pulses, but serial loading is recommended for production flexibility.

How does the DS5000-32-16+ ensure data retention during power loss?

The DS5000-32-16+ uses nonvolatile CMOS SRAM that maintains stored program and data for ≥10 years at room temperature without V_CC. It combines this with hardware power-fail detection (VPFW = 4.15–4.75 V) and an early-warning interrupt, allowing firmware to save critical state before brownout. A watchdog timer and power-on reset further guarantee deterministic recovery. This crashproof behavior is intrinsic to the DS5000-32-16+ architecture.

Is the DS5000-32-16+ pin-compatible with standard 8051 microcontrollers?

Yes, the DS5000-32-16+ is explicitly designed for 8051 pinout compatibility in its 40-pin PDIP package. Signals including P0–P3, RST, ALE, PSEN, EA, XTAL1/XTAL2, and V_CC/GND align with industry-standard 8051 layouts. This enables drop-in replacement in existing 8051 designs - though firmware must be adapted to leverage nonvolatile SRAM and serial loader features unique to the DS5000-32-16+.

What security mechanisms does the DS5000-32-16+ provide against firmware tampering?

The DS5000-32-16+ implements software security through encrypted execution and programmable lock bits. Users load a 40-bit encryption key via the serial loader command 'K', then enable the security lock (MCON.0) using command 'Z'. Once locked, the DS5000-32-16+ prevents unauthorized readout or modification of program/data memory. The DS5000-32-16+ also supports CRC-16 checksum verification (command 'C') to detect corruption.