Analog Devices Inc./Maxim Integrated DS1350WP-150

Overview

DS1350WP-150 from Maxim Integrated is a 3.3V, 1024k-bit (131,072 × 8) nonvolatile static RAM with integrated lithium battery backup, power-fail detection, automatic write protection, and battery voltage monitoring. It delivers 100 ns read/write access time, 50 µA typical standby current, and 10-year data retention without external power. It replaces 128k × 8 SRAM/EEPROM/Flash in mission-critical industrial memory logging systems.

For engineers reviewing the DS1350WP-150 datasheet, DS1350WP-150 pinout, DS1350WP-150 application, or DS1350WP-150 equivalent, key selection considerations include its PowerCap Module (PCM) package compatibility with DS9034PC+, VCC fail-detect timing (tPD = 1.5 µs), RST open-drain reset output with 200 ms power-on hold, BW battery warning output, and guaranteed 2.8 V write-protection threshold.

Technical Context

The DS1350WP-150 integrates a fully static SRAM core with autonomous power management circuitry that monitors VCC in real time. When VCC drops below 2.8 V, it unconditionally enables write protection and switches to lithium backup at ~2.5 V; during power-up, it holds RST active for 125–350 ms (tREC/tRPU) to ensure system stability before enabling normal operation.

Its dual open-drain outputs-RST (reset) and BW (battery warning)-require external pull-ups and sink up to 10 mA. Battery health is verified daily via a 1-second 1 MΩ load test; BW asserts if voltage falls below 2.6 V and remains asserted until module replacement, even after subsequent VCC power cycles.

Key Specifications

Pinout & Package

DS1350WP-150 uses the 34-pin PowerCap Module (PCM) package - a surface-mountable base that mates with the snap-on DS9034PC+ PowerCap containing the lithium battery. The PCM design isolates the battery from reflow soldering temperatures (≤260°C), enabling standard SMT assembly prior to PowerCap attachment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1345WP-100IND+ and STK13C68-3J, DS1350WP-150 uniquely combines 100 ns access, 10-year retention, open-drain BW/RST outputs, and field-replaceable PowerCap - making it the only option supporting both high-speed operation and predictive battery maintenance in industrial deployments.

Availability

DS1350WP-150 is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, and medical event recorders requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for DS1350WP-150 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, medical, and communications applications.

The DS1350WP-150 belongs to Maxim's PowerCap nonvolatile SRAM product line, engineered specifically for systems needing seamless, transparent memory backup without firmware intervention or external supervision circuitry.

FAQ

What is the guaranteed data retention period for DS1350WP-150 under zero-power conditions?

The DS1350WP-150 guarantees a minimum of 10 years of data retention when powered off, measured cumulatively from the moment VCC is first applied. This specification assumes proper initial activation (which connects the lithium source) and operation within the rated temperature range. The DS1350WP-150 achieves this using a sealed, freshness-sealed lithium battery and autonomous power-switching circuitry that minimizes self-discharge.

Does DS1350WP-150 require an external PowerCap, and which one is compatible?

Yes, DS1350WP-150 requires a separate DS9034PC+ or DS9034PCI+ PowerCap to function as a complete nonvolatile SRAM module. The DS1350WP-150 is the PCM base; the PowerCap snaps onto it post-reflow and contains the lithium battery. These components are ordered separately - DS1350WP-150 does not include the battery, and DS9034PC+ is not interchangeable with other PowerCap variants.

How does the battery warning (BW) output behave once triggered on DS1350WP-150?

Once the DS1350WP-150 detects battery voltage ≤2.6 V during its daily 1-second test, the BW output asserts low and remains latched in that state until the entire PowerCap Module is replaced. Even after subsequent VCC power cycles, BW stays active if the battery remains depleted. This behavior ensures field technicians receive unambiguous, persistent notification of end-of-life - a design feature unique to the DS1350WP-150 among Maxim's nvSRAM offerings.

What is the purpose of the RST output on DS1350WP-150, and how is it timed?

The RST output on DS1350WP-150 is an open-drain reset signal that holds the host processor in reset during power-up transients and VCC ramp-up. After VCC rises above the valid threshold, RST remains active for 125–350 ms (tRPU) to satisfy tREC timing and prevent premature execution. During power failure, RST asserts within 15 µs (tRPD) to warn the system of imminent shutdown - a critical timing guarantee enforced by the DS1350WP-150's internal voltage monitor.

Can DS1350WP-150 operate without external pull-up resistors on RST and BW pins?

No, DS1350WP-150 cannot operate correctly without external pull-up resistors on both RST and BW pins. These outputs are open-drain and require pull-ups to VCC (typically 4.7 kΩ–10 kΩ) to generate valid logic-high levels. Without them, RST and BW remain floating or weakly pulled low, preventing proper reset signaling and battery warning detection. The DS1350WP-150 datasheet specifies that both pins sink up to 10 mA, confirming their open-drain driver strength.