Infineon Technologies STK14C88-NF35TR

Overview

STK14C88-NF35TR from Cypress Semiconductor is a 32K × 8 (256 Kb) nonvolatile static RAM with AutoStore functionality, operating at 35 ns read/write cycle time, single 5V ±10% supply, and 100-year data retention. It integrates Quantum Trap nonvolatile storage per cell, enabling automatic STORE on power loss and RECALL on power-up. Used in industrial control systems requiring persistent memory without battery backup.

For engineers reviewing the STK14C88-NF35TR datasheet, STK14C88-NF35TR pinout, STK14C88-NF35TR application, or STK14C88-NF35TR equivalent, key selection criteria include hardware/software-controlled STORE/RECALL timing, HSB signaling behavior, VCAP capacitor interface, and compatibility with legacy SRAM bus protocols in mission-critical embedded systems.

Technical Context

The STK14C88-NF35TR implements a monolithic nvSRAM architecture where each SRAM cell includes an integrated Quantum Trap nonvolatile element. STORE and RECALL operations are managed by dedicated on-die power-control logic that monitors VCC decay and triggers capacitor-backed write-to-nonvolatile transfer within 10 ms.

It supports three operational modes: standard SRAM access (E/W/G controlled), hardware-triggered STORE (HSB low pulse), and software-initiated STORE/RECALL via address/command sequences. The device maintains full SRAM timing compliance (tRC = 35 ns) while adding deterministic nonvolatile persistence without external controllers or batteries.

Key Specifications

Pinout & Package

32-pin 300 mil SOIC (RoHS-compliant), surface-mount package with standard JEDEC outline and thermal profile compatible with reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-NF35TR, the STK14C88-NF35TR offers proven industrial reliability at lower cost but lacks extended temperature support; versus FM24CL64-G, it delivers 4× faster access and true SRAM timing compliance, though requiring VCAP and parallel bus resources.

Availability

STK14C88-NF35TR is available at Aetrix Electronics and suitable for industrial PLC data logging, medical device configuration storage, and smart meter firmware state backup requiring stable component supply across multi-year production programs.

Supply support for STK14C88-NF35TR 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

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in memory, microcontrollers, and connectivity solutions for industrial, automotive, and consumer applications.

The STK14C88 belongs to Cypress's nvSRAM product line, designed specifically to replace battery-backed SRAM in applications demanding zero-maintenance, long-term data retention, and deterministic power-loss recovery without external circuitry.

FAQ

What is the minimum VCAP capacitance required for reliable AutoStore operation?

The STK14C88-NF35TR requires a minimum 4.7 µF tantalum capacitor rated at ≥6.3 V on the VCAP pin. This value ensures sufficient charge to complete the 10 ms STORE cycle under worst-case VCC droop conditions (5.5 V → 2.7 V). Ceramic capacitors are not recommended due to voltage coefficient and ESR limitations.

Can STK14C88-NF35TR operate in software STORE mode without connecting HSB?

Yes-HSB may be left unconnected (weak internal pull-up holds it high) when using only software-initiated STORE/RECALL. However, hardware STORE initiation and busy-status monitoring require external pull-down capability and signal routing. Leaving HSB floating is acceptable only if hardware STORE is disabled in system design.

Does STK14C88-NF35TR support byte-level writes like standard SRAM?

Yes-it functions identically to a standard 32K × 8 SRAM for all read/write operations. Address and data lines behave per JEDEC-standard parallel SRAM timing, including byte-wide writes enabled by E/W/G control. Nonvolatile STORE always operates on the entire 32K-byte array, not individual bytes.

Is STK14C88-NF35TR compliant with RoHS and REACH regulations?

Yes-the "NF" suffix denotes RoHS-compliant packaging (32-pin 300 mil SOIC, lead-free finish, halogen-free molding compound). Full compliance documentation, including substance declarations and test reports, is available through Aetrix Electronics' component traceability portal upon request.