Infineon Technologies STK14CA8-NF45TR

Overview

STK14CA8-NF45TR from Cypress Semiconductor is a 128K × 8 (1 Mb) nonvolatile static RAM with integrated QuantumTrap storage, delivering 45 ns read/write cycle time, automatic power-loss STORE and power-up RECALL, and unlimited SRAM endurance. It operates at 3.0V ±10% over industrial temperature range (–40°C to +85°C) and is used in mission-critical data logging systems where volatile memory loss must be prevented without external backup circuitry.

For engineers reviewing the STK14CA8-NF45TR datasheet, STK14CA8-NF45TR pinout, STK14CA8-NF45TR application, or STK14CA8-NF45TR equivalent, key selection criteria include AutoStore timing (12.5 ms), VCAP capacitor requirement (17–120 µF), HSB hardware control interface, and compatibility with standard parallel SRAM bus protocols in industrial controllers and metering hardware.

Technical Context

The STK14CA8-NF45TR integrates a 1024 × 1024 SRAM array with monolithic QuantumTrap nonvolatile storage cells per bit, enabling true single-chip nvSRAM functionality. Its dual-mode STORE operation supports both automatic detection of VCC drop below 2.65 V and explicit hardware/software initiation via HSB or command sequence.

RECALL occurs automatically on power-up when VCC rises above 2.65 V, completing within 20 ms. The device uses standard parallel address/data bus (A16–A0, DQ7–DQ0) with E/G/W control logic identical to conventional SRAMs, ensuring drop-in replacement capability in existing designs without protocol translation.

Key Specifications

Pinout & Package

STK14CA8-NF45TR is packaged in a 32-pin SOIC (Small Outline Integrated Circuit) with 0.4-inch body width and standard JEDEC MS-012AC footprint. Pin spacing is 0.050 inch (1.27 mm), compatible with automated PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14CA8-RF45ITR, the NF45TR offers superior thermal dissipation and smaller PCB footprint; compared with FM24CL16B-G, it delivers 64× greater density, parallel bus compatibility, and deterministic STORE timing - critical for real-time industrial control.

Availability

STK14CA8-NF45TR is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, and railway event recorders requiring stable component supply and long-term lifecycle support.

Supply support for STK14CA8-NF45TR 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 U.S.-based semiconductor company specializing in high-reliability memory, PSoC programmable systems-on-chip, and automotive-grade ICs.

The STK14CA8 belongs to Cypress's nvSRAM product line, designed specifically for applications demanding zero-battery nonvolatile storage with SRAM speed and endurance - targeting utility, transportation, and medical sectors where data integrity is legally mandated.

FAQ

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

The datasheet specifies a minimum VCAP capacitance of 17 µF (5 V rated) between the VCAP pin and VSS. This value ensures sufficient energy storage to complete the 12.5 ms STORE cycle under worst-case VCC droop conditions at maximum junction temperature. Using less than 17 µF risks incomplete STORE and data loss; recommended practice is to use 47–100 µF tantalum or polymer capacitors for margin.

Can STK14CA8-NF45TR be used as a direct replacement for standard 128K×8 SRAMs?

Yes - STK14CA8-NF45TR is pin- and timing-compatible with industry-standard 32-pin SOIC parallel SRAMs (e.g., IS61LV1288AL). All control signals (E, G, W), address (A16–A0), and data (DQ7–DQ0) match. The only design change needed is adding the VCAP capacitor and optionally connecting HSB for hardware STORE control.

Does the device perform STORE during normal operation without power loss?

No - STORE occurs only during power loss (AutoStore) or when explicitly triggered via HSB pin assertion or software command. The device does not initiate STORE during stable VCC operation, even after writes. However, if a WRITE has not occurred since the last STORE/RECALL cycle, the next AutoStore will be skipped - a power-saving feature confirmed in the datasheet on page 9.

What is the maximum operating frequency supported by the 45 ns access time?

A 45 ns access time corresponds to a maximum sustained bus clock rate of approximately 22 MHz (1/45 ns ≈ 22.2 MHz), assuming zero wait states and ideal signal integrity. In practice, system-level timing margins (address setup/hold, enable propagation) limit usable frequency to ~15–18 MHz in industrial PCBs with 10–15 cm trace lengths and standard FR-4 stackup.