Analog Devices Inc./Maxim Integrated DS2250-32-16+

Overview

DS2250-32-16+ from Maxim Integrated is an 8-bit 8051-compatible soft microcontroller module with 32kB nonvolatile SRAM, 16MHz max crystal speed, and no integrated real-time clock. It operates across 0°C to +70°C, supports serial bootstrap loading and in-system program modification, and delivers 48mA typical operating current at 16MHz for embedded control applications requiring persistent memory retention without backup power.

For engineers reviewing the DS2250-32-16+ datasheet, DS2250-32-16+ pinout, DS2250-32-16+ application, or DS2250-32-16+ equivalent, key selection considerations include nonvolatile RAM size, absence of RTC, RoHS-compliant 40-pin SIMM package, and compatibility with standard 8051 development tools and Intel HEX programming workflows.

Technical Context

The DS2250-32-16+ implements a fully 8051-object-code-compatible CPU core with on-chip nonvolatile SRAM configured as both program and data memory. Its memory map supports separate 64kB program and data address spaces, with internal 32kB NV RAM partitioned via MCON register settings to allocate banks for code or data use.

It features dual timer/event counters, full-duplex UART (P3.0/P3.1), 32 parallel I/O lines across Ports 0–3, and hardware-assisted power-fail detection with early-warning interrupt and reset. Serial bootstrap loading operates at 300–9600 bps using ASCII CR commands, while parallel programming uses 87C51H-timing-compatible cycles with VPP = 13V.

Key Specifications

Pinout & Package

DS2250-32-16+ is housed in a 40-pin SIMM (Single In-line Memory Module) package with 2.65″ × 2.385″ footprint, 0.050″ lead pitch, and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar soft microcontroller applications.

Compared with DS2250-8-16+, DS2250-32-16+ provides 4× more nonvolatile memory for larger firmware or data buffers without changing PCB layout; compared with DS2250T-32-16+, it omits the RTC subsystem-reducing power budget and eliminating crystal placement, making it optimal for cost-constrained, time-agnostic control nodes.

Availability

DS2250-32-16+ is available at Aetrix Electronics and suitable for industrial data loggers, secure metering terminals, medical handheld diagnostics, factory automation controllers, and embedded telemetry systems requiring stable component supply across extended product lifecycles.

Supply support for DS2250-32-16+ 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, medical, and communications markets.

The DS2250(T) product line delivers secure, nonvolatile 8051-based microcontrollers optimized for applications demanding firmware persistence, in-field programmability, and deterministic power-fail response without external support components.

FAQ

What is the maximum crystal frequency supported by DS2250-32-16+?

The DS2250-32-16+ supports a maximum crystal frequency of 16MHz, as confirmed in the Ordering Information table and AC Characteristics section. At this speed, it achieves 48mA typical operating current and meets all expanded bus timing specifications including tCLK = 62.5ns. Crystals above 16MHz are not supported and may cause timing violations or oscillator instability.

Does DS2250-32-16+ include a real-time clock (RTC)?

No, DS2250-32-16+ does not include a real-time clock. The "+" suffix denotes RoHS compliance, not RTC inclusion. Only DS2250T-xx-xx variants (e.g., DS2250T-32-16+) integrate the permanently powered RTC with on-board crystal. DS2250-32-16+ relies on software timers or external RTC ICs for timekeeping functions.

How is program memory loaded into DS2250-32-16+?

DS2250-32-16+ supports two loading methods: serial bootstrap loading via UART (P3.0/P3.1) at 300–9600 bps using Intel HEX format and ASCII carriage return initiation, or parallel programming using 87C51H-compatible cycles with VPP = 13V applied to the EA pin. Both methods allow in-system programming without removing the device from the target board.

What is the nonvolatile memory retention period for DS2250-32-16+?

The DS2250-32-16+ guarantees nonvolatile memory retention of ≥10 years at room temperature (25°C) with no applied VCC. This applies to all 32kB of embedded SRAM, internal data registers, and configuration registers. Retention time decreases at elevated temperatures per Arrhenius model but remains validated per manufacturer specification under specified conditions.

Is DS2250-32-16+ pin-compatible with other DS2250(T) variants?

Yes, DS2250-32-16+ is pin-compatible with all DS2250(T) family members in the 40-pin SIMM package-including DS2250-8-16+, DS2250-64-16+, DS2250T-32-16+, and DS2250T-64-16+. Pin assignments, electrical characteristics, and timing parameters are identical across variants; only memory size and RTC presence differ, controlled by internal configuration bits and not pin function.