Infineon Technologies STK14CA8-NF25ITR

Overview

STK14CA8-NF25ITR from Cypress Semiconductor is a 128K × 8 (1 Mb) nonvolatile static RAM with integrated QuantumTrap storage, delivering 25 ns read access time, single 3.0V ±10% operation, and automatic STORE/RECALL on power loss/power-up. It provides unlimited SRAM read/write endurance, 20-year data retention at 55°C, and operates across industrial temperature range (–40°C to +85°C). Used in metering, industrial PLCs, and network equipment requiring persistent memory without battery backup.

For engineers reviewing the STK14CA8-NF25ITR datasheet, STK14CA8-NF25ITR pinout, STK14CA8-NF25ITR application, or STK14CA8-NF25ITR equivalent, key selection criteria include AutoStore timing (12.5 ms), VCAP capacitor requirement (17–120 µF), HSB pin behavior during STORE, and compatibility with 32-pin SOIC footprint and standard SRAM interface timing.

Technical Context

The STK14CA8 integrates a full 1 Mb SRAM array with monolithic QuantumTrap nonvolatile storage cells-each memory cell includes both volatile SRAM and nonvolatile trap elements. STORE is triggered automatically below VSWITCH (2.65 V) or via hardware (HSB low) or software command; RECALL restores data on power-up within 20 ms.

It uses standard asynchronous SRAM control signals (E, G, W) with CMOS-compatible logic levels (VIH = 2.0 V, VIL = 0.8 V), supports tristate outputs, and requires external VCAP decoupling (17–120 µF, 5 V rated) connected to VCAP–VSS for reliable STORE operation under brownout conditions.

Key Specifications

Pinout & Package

STK14CA8-NF25ITR is packaged in a 32-pin SOIC (Small Outline Integrated Circuit) with 0.4-inch body width and standard JEDEC MS-012AC footprint. Pin 1 is marked by notch or dot; pin numbering follows counterclockwise convention starting from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS1C1M8-25TIN and FM16W08-SG, STK14CA8-NF25ITR uniquely balances 25 ns speed, 20-year retention, and 200K STORE cycles - making it optimal for infrastructure-grade applications where longevity and deterministic timing outweigh ultra-high write frequency needs.

Availability

STK14CA8-NF25ITR is available at Aetrix Electronics and suitable for smart metering, industrial automation, telecom infrastructure, and medical diagnostics requiring stable component supply and long-lifecycle support.

Supply support for STK14CA8-NF25ITR 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 STK14CA8 belongs to Cypress's nvSRAM product line, engineered to replace battery-backed SRAM in mission-critical systems where maintenance-free, long-term nonvolatility is mandatory.

FAQ

What is the role of the VCAP pin and what capacitor value is required?

The VCAP pin connects to an external capacitor (17–120 µF, 5 V rated) that supplies energy during VCC collapse to complete the 12.5 ms STORE operation. This capacitor must be placed close to the pin with low-ESR construction; insufficient capacitance causes incomplete STORE and data loss. Typical designs use 47 µF tantalum or polymer capacitors.

How does AutoStore differ from software-controlled STORE?

AutoStore triggers automatically when VCC drops below 2.65 V, requiring no host action. Software STORE uses a specific 8-byte command sequence written to address 0x0000–0x0007, allowing precise control over when data is saved - e.g., after critical state updates or before firmware upgrades. Both use identical internal STORE circuitry and timing.

Can STK14CA8-NF25ITR operate in a 2.5 V system?

No. The device requires VCC between 2.7 V and 3.6 V per specification. Operation below 2.7 V violates DC characteristics, risks incomplete STORE/RECALL, and invalidates timing parameters. Systems with 2.5 V rails must use level-shifting or select alternative nvSRAMs rated for lower voltage.

Is HSB pin connection mandatory for reliable operation?

No - HSB is optional. When left unconnected, its internal weak pull-up holds it high, disabling hardware-triggered STORE. It is only required if external hardware control of STORE is needed (e.g., using a power-fail comparator). During normal AutoStore or software STORE, HSB remains high and can be ignored.