Analog Devices Inc./Maxim Integrated DS5000T-32-16

Overview

DS5000T-32-16 from Maxim Integrated is an 8-bit 8051-compatible microcontroller with 32 kB nonvolatile SRAM, 16 MHz maximum crystal frequency, and integrated permanently powered real-time clock (RTC). It executes encrypted software, supports serial bootstrap loading, and delivers crashproof operation with 10-year data retention at room temperature without V_CC. Used in secure embedded systems requiring tamper-resistant firmware storage and persistent timekeeping.

For engineers reviewing the DS5000T-32-16 datasheet, DS5000T-32-16 pinout, DS5000T-32-16 application, or DS5000T-32-16 equivalent, this page provides verified technical context, pin-level circuit roles, memory-mapped RTC access, power-fail interrupt behavior, and validated alternative microcontrollers for secure 8051-based designs.

Technical Context

The DS5000T-32-16 implements a fully 8051-compatible CPU core with object-code compatibility for existing 8051 toolchains. Its internal 32 kB nonvolatile SRAM serves as both program and data memory, accessible via standard MOVX instructions when ECE2=1 to enable RTC register mapping.

It features dual reset mechanisms-power-fail interrupt (VPFW = 4.15–4.75 V) and active-high RST-and integrates a watchdog timer, early-warning power-fail detection, and hardware encryption key registers. The RTC operates independently using an on-board crystal and maintains time to 0.01-second resolution without external power.

Key Specifications

Pinout & Package

DS5000T-32-16 is housed in a 40-pin plastic DIP package (0.600" width), compliant with JEDEC MS-001. Pin assignments follow industry-standard 8051 layout with expanded bus support.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS5000T-32-16, DS5000-32-16 removes RTC capability while retaining identical security and nonvolatile memory architecture, whereas DS89C450 trades NV SRAM and integrated RTC for higher clock speed and Flash-based program storage-requiring external components for equivalent data persistence and timekeeping.

Availability

DS5000T-32-16 is available at Aetrix Electronics and suitable for secure access control systems, industrial data loggers, medical device configuration modules, and energy meter firmware managers requiring stable component supply and long-term lifecycle assurance.

Supply support for DS5000T-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 secure microcontroller solutions for industrial, medical, and communications applications.

The DS5000T-32-16 belongs to Maxim's Secure Microcontroller family, engineered specifically for applications demanding firmware encryption, power-loss resilience, and integrated timekeeping without external support components.

FAQ

What is the primary function of the DS5000T-32-16 in embedded systems?

The DS5000T-32-16 serves as a secure, crashproof 8051-compatible microcontroller with 32 kB nonvolatile SRAM and integrated real-time clock. Its primary function is to execute encrypted firmware, retain critical program and data through power loss, and maintain precise timekeeping-enabling tamper-resistant, battery-free operation in safety-critical applications. DS5000T-32-16 achieves this without external EEPROM, RTC chips, or backup batteries.

How does the DS5000T-32-16 handle power failure events?

The DS5000T-32-16 incorporates a dedicated VPFW input that triggers an early-warning power-fail interrupt when V_CC drops below 4.15 V. This allows firmware to initiate immediate save-to-NV-SRAM operations before brownout. Combined with its nonvolatile SRAM, DS5000T-32-16 preserves all registers, program code, and data for ≥10 years at room temperature with zero power applied.

Can the DS5000T-32-16 be programmed in-system without a dedicated programmer?

Yes-the DS5000T-32-16 supports in-system serial bootstrap loading via its on-chip UART (P3.0/RXD and P3.1/TXD). Using a simple 3-wire RS-232 interface (TX, RX, GND), engineers can load Intel HEX files at baud rates from 300 to 57.6 kbps. DS5000T-32-16 enters this mode automatically upon reset with PSEN asserted low, eliminating need for external parallel programmers.

What is the role of the ECE2 bit in accessing the RTC on the DS5000T-32-16?

The ECE2 bit (MCON.2) enables alternate memory mapping for RTC access on the DS5000T-32-16. When ECE2 = 1, all MOVX instructions target the RTC's serial register space instead of standard data memory. This hardware-selectable bank switching allows timekeeping registers to coexist with application data in the same 32 kB NV SRAM without address conflicts. DS5000T-32-16 requires explicit MCON register writes to toggle ECE2 before RTC reads/writes.

Is the DS5000T-32-16 pin-compatible with standard 8051 microcontrollers?

Yes-the DS5000T-32-16 uses a standard 40-pin DIP package with pinout fully compatible with industry-standard 8051 devices, including identical placement of RST, PSEN, ALE, EA, and I/O ports. This allows direct PCB replacement in existing 8051 designs. DS5000T-32-16 maintains functional equivalence for all core peripherals while adding nonvolatile memory and RTC without altering layout or signal routing.