Infineon Technologies STK14CA8-NF45ITR

Overview

STK14CA8-NF45ITR from Cypress Semiconductor is a 128K × 8 (1 Mb) nonvolatile static RAM with integrated QuantumTrap storage, operating at 3.0V ±10%, offering 45 ns read/write cycle time, automatic STORE on power loss, and automatic RECALL on power-up. It delivers unlimited SRAM read/write endurance, 20-year data retention at 55°C, and supports industrial temperature range (–40°C to +85°C) in 32-pin SOIC package. Used in mission-critical data logging systems where volatile memory backup must survive unexpected power failure.

For engineers reviewing the STK14CA8-NF45ITR datasheet, STK14CA8-NF45ITR pinout, STK14CA8-NF45ITR application, or STK14CA8-NF45ITR equivalent, this nvSRAM provides deterministic AutoStore timing, hardware/software-controlled STORE/RECALL, VCAP-supervised nonvolatile write integrity, and compatibility with standard parallel SRAM interfaces-key for industrial control, metering, and telecom infrastructure designs requiring zero-data-loss persistence.

Technical Context

The STK14CA8-NF45ITR integrates a 1024 × 1024 SRAM array with per-cell QuantumTrap nonvolatile storage, enabling atomic STORE/RECALL operations without external controllers. Its logic block includes dedicated HSB (Hardware Store Busy) signaling, VCAP-supplied energy hold-up for reliable STORE execution during brownout, and dual-mode operation: AutoStore triggered by VCC drop below 2.65 V or explicit software/hardware initiation.

It uses standard parallel interface timing with E (chip enable), G (output enable), and W (write enable) controls, supporting both address-controlled and E/G-controlled read cycles and W/E-controlled write cycles. All SRAM access is suspended during STORE (12.5 ms typical) and RECALL (20 ms), with HSB asserted low to signal active nonvolatile operation.

Key Specifications

Pinout & Package

STK14CA8-NF45ITR is packaged in a 32-pin Small Outline Integrated Circuit (SOIC) with 0.3 inch body width, RoHS-compliant, surface-mountable footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK14C88-35I and AS1C1M816P-45TIN, the STK14CA8-NF45ITR uniquely combines autonomous AutoStore, hardware-triggerable STORE via HSB, and industrial SOIC packaging - delivering lowest system-level design effort for fail-safe data retention without external supervision circuitry.

Availability

STK14CA8-NF45ITR is available at Aetrix Electronics and suitable for industrial control systems, smart metering platforms, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed nonvolatile data integrity under power disruption.

Supply support for STK14CA8-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 STK14CA8 belongs to Cypress's nvSRAM product line, engineered specifically to replace battery-backed SRAM and EEPROM in applications demanding zero-maintenance, infinite-write-cycle, and deterministic power-loss data capture.

FAQ

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

The datasheet specifies a minimum VCAP capacitance of 17 µF, rated for 5 V, connected between VCAP and VSS. This value ensures sufficient stored energy to complete the 12.5 ms STORE cycle when VCC drops to 2.65 V. Using less than 17 µF risks incomplete STORE and data corruption; recommended derating is 2× (≥34 µF) for extended temperature or aging margin.

Can STK14CA8-NF45ITR be used as a drop-in replacement for standard SRAMs?

Yes - electrically and functionally compatible with standard 128K × 8 parallel SRAMs in read/write timing and pinout. However, VCAP must be populated and HSB monitored if STORE/RECALL status is needed. During normal operation (no power loss), it behaves identically to a fast SRAM; no firmware changes are required unless leveraging nonvolatile features.

Does the device perform STORE automatically during every power-down event?

No - STORE occurs only if an SRAM write has occurred since the last STORE or RECALL cycle. If no write took place, the nvSRAM skips STORE to preserve endurance. This behavior is hardware-enforced and cannot be overridden; it ensures the 200,000 STORE cycle rating applies only to actual data persistence events.

Is STK14CA8-NF45ITR still recommended for new designs?

No - Cypress documentation explicitly marks STK14CA8 as "Not Recommended for New Designs." While fully supported and available through Aetrix Electronics, designers should evaluate Infineon's newer nvSRAM families (e.g., CY14B101QN) for enhanced density, lower power, and extended lifecycle assurance beyond 2027.