Analog Devices Inc./Maxim Integrated DS1250ABP-100

Overview

DS1250ABP-100 from Maxim Integrated is a 4,194,304-bit (524,288 × 8) nonvolatile static RAM with integrated lithium backup, JEDEC-standard 34-pin PowerCap Module (PCM) package, 70ns access time, ±5% V_CC tolerance (4.75–5.25V), and industrial temperature support (-40°C to +85°C). It replaces volatile SRAM in battery-backed data logging systems requiring guaranteed 10-year data retention without external circuitry.

For engineers reviewing the DS1250ABP-100 datasheet, DS1250ABP-100 pinout, DS1250ABP-100 application, or DS1250ABP-100 equivalent, key selection criteria include write-protection voltage threshold (4.50–4.75V), PCM-compatible surface-mount integration, lithium-freshness seal activation at first power-up, and compatibility with standard 8-bit microprocessor buses.

Technical Context

The DS1250ABP-100 implements autonomous power-fail detection using internal voltage monitoring that triggers unconditional write protection when V_CC drops below 4.5V and switches to lithium backup below ~3.0V. Its control logic ensures all inputs become "don't care" and outputs go high-impedance during power transition.

It supports standard asynchronous SRAM timing with separate CE/OE/WE controls, full 19-bit address decoding (A0–A18), and byte-wide bidirectional data I/O (DQ0–DQ7). The PCM package separates SRAM module base (34-pin) from removable DS9034PC+ PowerCap, enabling reflow-safe assembly before battery attachment.

Key Specifications

Pinout & Package

DS1250ABP-100 uses a 34-pin PowerCap Module (PCM) package with standardized pinout for nonvolatile SRAMs. The module base integrates SRAM and control circuitry; the lithium battery is housed separately in the DS9034PC+ PowerCap, which snaps onto the base after reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1250Y-70IND+, DS1250ABP-100 offers tighter supply regulation and higher write-protection voltage-critical for systems with clean 5V rails and strict brownout response. Against STK15C88-70I, DS1250ABP-100 delivers guaranteed decade-long retention without external components, justifying its use in safety-critical, maintenance-free deployments.

Availability

DS1250ABP-100 is available at Aetrix Electronics and suitable for smart energy metering, industrial PLC data buffering, and avionics health monitoring requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for DS1250ABP-100 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 nonvolatile memory solutions for industrial, automotive, and communications markets.

The DS1250ABP-100 belongs to Maxim's nonvolatile SRAM product line, engineered specifically for systems needing drop-in replacement of volatile memory with guaranteed data retention, autonomous power-fail handling, and simplified board-level integration via the PowerCap Module architecture.

FAQ

What is the exact memory organization and density of the DS1250ABP-100?

The DS1250ABP-100 is organized as 524,288 words × 8 bits, totaling 4,194,304 bits (512 kilobytes). This matches the pinout and timing of standard 512k×8 volatile SRAMs, allowing direct substitution without address or data bus modification. Its 19 address lines (A0–A18) fully decode the memory space, and DQ0–DQ7 provide byte-wide bidirectional data transfer. The DS1250ABP-100 achieves this density while integrating lithium backup and power-monitoring circuitry into a single 34-pin PCM package.

Does the DS1250ABP-100 require external support circuitry for battery backup operation?

No, the DS1250ABP-100 requires no external support circuitry for battery backup operation. Its internal control circuitry autonomously monitors V_CC, disables writes below 4.5V, and switches to the integrated lithium source below ~3.0V. The lithium cell is factory-sealed and electrically disconnected until first V_CC application > 4.25V, ensuring full capacity. The DS1250ABP-100 operates as a complete nonvolatile SRAM module when paired with the DS9034PC+ PowerCap - no regulators, diodes, or capacitors are needed.

What is the role of the DS9034PC+ PowerCap in the DS1250ABP-100 system?

The DS9034PC+ PowerCap provides the removable lithium backup battery for the DS1250ABP-100. It snaps onto the 34-pin PCM module base after reflow soldering, avoiding thermal damage to the battery. The DS1250ABP-100's PCM package includes dedicated VBAT and GND contacts (pins 33 and 34) that mate with the PowerCap. The DS9034PC+ is keyed to prevent incorrect orientation, and its detachment feature allows field replacement using a standard screwdriver - a critical serviceability advantage over monolithic DIP-packaged NV SRAMs.

How does the DS1250ABP-100 handle power-up and power-down transitions?

During power-down, the DS1250ABP-100 detects V_CC decay via internal comparators and asserts write protection within 1.5 µs (t_PD). Below ~3.0V, it connects the lithium source to retain data. During power-up, once V_CC exceeds ~3.0V, it disconnects lithium and reconnects V_CC to the SRAM core. Full functional operation resumes only after V_CC exceeds 4.75V, with write protection remaining active until then. The DS1250ABP-100 guarantees this behavior across -40°C to +85°C.

Is the DS1250ABP-100 compatible with standard 8-bit microprocessor buses?

Yes, the DS1250ABP-100 is fully compatible with standard 8-bit microprocessor buses including Z80, 80C88, and 68000 derivatives. It uses industry-standard CE/OE/WE control signals, 19-bit address inputs (A0–A18), and 8-bit bidirectional data I/O (DQ0–DQ7). Its 70ns access time and timing parameters (tACC = 70ns, tCO = 70ns, tOE = 35ns) meet or exceed requirements for 14 MHz bus operation. The DS1250ABP-100 requires no glue logic or timing adapters for integration into existing SRAM-based systems.