Infineon Technologies STK14C88-NF45ITR

Overview

STK14C88-NF45ITR from Cypress Semiconductor is a 32K × 8 (256 Kb) nonvolatile static RAM with AutoStore functionality, operating at 45 ns read/write cycle time on a single 5V ±10% supply. It integrates Quantum Trap nonvolatile storage per cell, enabling automatic STORE on power loss and automatic RECALL at power-up. Used in industrial control data logging where persistent SRAM state must survive uncontrolled power interruption.

For engineers reviewing the STK14C88-NF45ITR datasheet, STK14C88-NF45ITR pinout, STK14C88-NF45ITR application, or STK14C88-NF45ITR equivalent, key selection criteria include guaranteed 45 ns access timing, hardware/software-controlled STORE/RECALL, VCAP-backed power-loss protection, and 100-year data retention without battery backup.

Technical Context

The STK14C88-NF45ITR implements a monolithic nvSRAM architecture combining a fast 32K×8 SRAM array with integrated Quantum Trap nonvolatile storage cells. Its STORE operation transfers data from SRAM to nonvolatile elements either automatically on VCC drop below threshold or via HSB assertion or software command; RECALL restores data on power-up or via software.

It supports standard parallel SRAM interface timing (E, G, W controls), includes HSB pin for hardware store busy indication and initiation, and requires external VCAP capacitor (typically 4.7 µF tantalum) connected to VCAP pin to sustain STORE during brownout. No external battery or EEPROM controller is needed.

Key Specifications

Pinout & Package

32-pin 300-mil SOIC package (RoHS-compliant), footprint-compatible with industry-standard 32-pin memory sockets. Pinout validated per Cypress Document 001-52038 Rev. *B, Page 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-NF45I and FM24V10-G, the STK14C88-NF45ITR provides proven AutoStore autonomy with minimal external components, making it optimal for retrofit designs where power-fail detection logic is absent and 256 Kb capacity suffices.

Availability

STK14C88-NF45ITR is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, and railway signaling controllers requiring stable component supply and long-term obsolescence management.

Supply support for STK14C88-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.

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

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

The STK14C88-NF45ITR requires a minimum 4.7 µF tantalum capacitor on the VCAP pin to guarantee STORE completion across the full industrial temperature range (–40°C to +85°C) and worst-case VCC dropout profile. Lower values may function at room temperature but risk incomplete STORE under cold conditions or rapid voltage decay.

Can STK14C88-NF45ITR operate without the VCAP capacitor?

No. The VCAP capacitor is mandatory for AutoStore functionality. Without it, the device operates as a volatile SRAM only - all data is lost on power removal, and hardware STORE commands will fail silently. The VCAP pin must be connected to a properly rated capacitor; leaving it floating or shorted violates absolute maximum ratings.

How does software STORE differ from hardware STORE in timing behavior?

Software STORE initiates after CPU writes a specific address/data sequence and completes in ≤10 ms, identical to hardware STORE duration. However, software STORE requires the device to be in active mode (E low), while hardware STORE can be triggered asynchronously via HSB even during standby - enabling faster response to external power-fail signals.

Is STK14C88-NF45ITR pin-compatible with standard 32K×8 SRAMs like AS6C4008?

Yes, it is pin-compatible with industry-standard 32-pin SOIC 32K×8 SRAMs in address, data, and control pin layout (A0–A14, DQ0–DQ7, E, W, G, VCC, VSS). However, VCAP and HSB pins are unique to nvSRAM and must be externally terminated per Cypress guidelines - unused HSB should be pulled up, and VCAP must be populated.