Infineon Technologies STK11C88-NF45ITR

Overview

STK11C88-NF45ITR from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile static RAM with integrated QuantumTrap™ nvSRAM technology, operating at 45 ns access time on a single 5V ±10% supply. It delivers unlimited SRAM read/write endurance, 1,000,000 STORE cycles, 100-year data retention, and automatic hardware RECALL on power-up. Used in industrial control modules where persistent memory state must survive uncontrolled power loss without external backup.

For engineers reviewing the STK11C88-NF45ITR datasheet, STK11C88-NF45ITR pinout, STK11C88-NF45ITR application, or STK11C88-NF45ITR equivalent, key selection criteria include software-initiated STORE/RECALL sequence compatibility, SOIC-28 package footprint alignment with legacy SRAM designs, VCC=4.5–5.5V operation under industrial temperature (-40°C to +85°C), and hardware protection against low-voltage STORE corruption.

Technical Context

The STK11C88-NF45ITR integrates a standard 32K × 8 SRAM array with co-located nonvolatile QuantumTrap cells per bit, enabling byte-level persistence without external capacitors or batteries. Its dual-mode operation-standard SRAM access and software-triggered nonvolatile transfer-relies on six precise CE-controlled READ address sequences (e.g., 0x0E38 → 0x0FC0 for STORE).

Hardware RECALL activates automatically when VCC rises above VSWITCH after power interruption, completing in tHRECALL ≤ 20 ms. The device enforces hardware STORE inhibition below VSWITCH and disables outputs during STORE/RECALL cycles to prevent bus contention, with OE-controlled tristate output buffers and WE/CE/OE active-low timing compliance per JEDEC SRAM standards.

Key Specifications

Pinout & Package

28-pin Small Outline Integrated Circuit (SOIC), 300 mil body width, RoHS-compliant, surface-mount package with standard JEDEC MO-012AC outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK11C88-NF45ITR, the NF25ITR trades higher power for faster access in timing-critical control loops, while the FM24CL64-G sacrifices autonomy and speed for serial interface simplicity and smaller footprint-neither replicates the seamless hardware RECALL or per-bit QuantumTrap reliability.

Availability

STK11C88-NF45ITR is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion devices, smart energy meters, and avionics telemetry systems requiring stable component supply and long-term obsolescence support.

Supply support for STK11C88-NF45ITR 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) designs high-reliability memory and programmable solutions for industrial, automotive, and communications markets, with headquarters in San Jose, CA.

The STK11C88 belongs to Cypress's SoftStore® nvSRAM product line, engineered specifically to replace battery-backed SRAM in mission-critical systems where maintenance-free, zero-battery nonvolatility is mandatory.

FAQ

What triggers automatic RECALL on power-up?

Automatic RECALL initiates when VCC rises above the internal VSWITCH threshold (~3.0 V) after power interruption. The device latches a hardware RECALL request during undervoltage conditions and executes the restore sequence within tHRECALL ≤ 20 ms once VCC stabilizes. No firmware intervention is required, and the SRAM contents are fully restored before the first valid read cycle.

Can STORE and RECALL be performed while the system is running?

Yes-both STORE and RECALL are software-initiated via six consecutive CE-controlled READ operations to specific addresses (e.g., 0x0FC0 for STORE). During execution, the device disables I/O and halts SRAM access for tSTORE (max 20 ms) or tRECALL (max 20 ms). System firmware must pause memory traffic and ensure no intervening accesses break the address sequence.

Is the STK11C88-NF45ITR pin-compatible with standard 28-pin SRAMs?

Yes-it uses identical 28-pin SOIC (300 mil) packaging and matches the pinout of industry-standard 32K × 8 SRAMs (e.g., AS6C4008, CY62128). Address (A0–A14), data (DQ0–DQ7), and control (CE, WE, OE, VCC, VSS) signals align directly, enabling drop-in replacement without PCB redesign.

Does the device require external components for nonvolatile operation?

No external capacitors, batteries, or charge pumps are needed. QuantumTrap technology embeds nonvolatility at the cell level. A 0.1 µF ceramic bypass capacitor between VCC and VSS is required for noise suppression, but no backup power source or external controller is necessary for STORE/RECALL functionality or data retention.