Infineon Technologies STK14C88-C45I

Overview

STK14C88-C45I from Cypress Semiconductor is a 32K × 8 (256 Kb) nonvolatile static RAM with integrated Quantum Trap storage, delivering 45 ns read/write cycle time, automatic STORE on power loss, and automatic RECALL on power-up. It operates from a single 5V ±10% supply, supports industrial temperature range (–40°C to +85°C), and uses a 32-pin 300-mil SOIC package for embedded data logging and control applications.

For engineers reviewing the STK14C88-C45I datasheet, STK14C88-C45I pinout, STK14C88-C45I application, or STK14C88-C45I equivalent, key selection considerations include AutoStore timing (10 ms), VCAP capacitor dependency, HSB hardware store busy signaling, and software-controlled STORE/RECALL capability in systems requiring guaranteed data retention without external backup power.

Technical Context

The STK14C88-C45I integrates SRAM and nonvolatile Quantum Trap cells monolithically, enabling true unlimited read/write endurance and 100-year data retention. Its dual-mode STORE operation-hardware-triggered via HSB low pulse or software-initiated through address/command sequences-ensures deterministic nonvolatile save timing independent of system firmware state.

Power management is tightly coupled: VCAP supplies energy during brownout to complete STORE within 10 ms; RECALL occurs automatically at VCC ≥ 2.0V. The device supports standard SRAM timing (E/G/W control), with HSB acting as both status output and hardware trigger input, and includes AutoStore INHIBIT mode via A13 pin configuration.

Key Specifications

Pinout & Package

Package: 32-pin 300-mil SOIC (RoHS-compliant), surface-mount, 0.300-inch body width, standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14C88-C45I, STK14CA8-45I improves long-term field reliability while maintaining drop-in compatibility, whereas FM1808-45-TG extends qualification scope to automotive but requires validation of revised HSB timing behavior in safety-critical paths.

Availability

STK14C88-C45I is available at Aetrix Electronics and suitable for industrial PLC data logging, medical device parameter storage, and avionics black box memory requiring stable component supply and guaranteed long-term availability.

Supply support for STK14C88-C45I 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-performance mixed-signal ICs for embedded control, connectivity, and memory applications.

The STK14C88 belongs to Cypress's nvSRAM product line, engineered to replace battery-backed SRAM in mission-critical systems where maintenance-free, long-term data retention is mandatory.

FAQ

Is VCAP capacitor value specified in the datasheet?

Yes - the datasheet specifies a minimum 4.7 µF tantalum or low-ESR electrolytic capacitor rated for ≥10 V at the VCAP pin. This value ensures sufficient energy storage to complete the 10 ms STORE operation during worst-case 5V supply collapse. Derating to 10 µF is recommended for extended temperature or aging margin.

Can STK14C88-C45I operate without VCAP connected?

No - VCAP must be connected for AutoStore functionality. Without VCAP, the device operates as a standard volatile SRAM with no nonvolatile STORE capability. The datasheet explicitly states that STORE will not execute if VCAP voltage falls below 2.0 V during power loss, making capacitor omission a functional failure mode.

What happens if HSB is left unconnected?

HSB has an internal weak pull-up, so it defaults high - disabling hardware-triggered STORE. The pin remains functional as a status output (goes low during STORE), but external STORE initiation requires pulling HSB low with a microcontroller GPIO or supervisor IC. Leaving it floating is acceptable only if software STORE is exclusively used.

Does RECALL occur before or after power-on reset assertion?

RECALL begins automatically when VCC rises above ~2.0 V and completes before most microcontrollers release their POR signal. The datasheet confirms RECALL finishes within 100 µs after VCC exceeds threshold, ensuring SRAM contents are restored prior to CPU instruction fetch - critical for boot-time configuration recovery.