# Technical Overview: STK17TA8-RF25 The **STK17TA8-RF25** is a high-performance **nvSRAM** (non-volatile Static Random Access Memory) manufactured by Infineon Technologies (formerly Cypress Semiconductor). It integrates a standard SRAM with a non-volatile QuantumTrap cell, ensuring data retention even when power is lost. --- ## 1. Key Specifications | Feature | Specification | | :--- | :--- | | **Memory Density** | 1 Mbit (128K x 8) | | **Interface** | Parallel | | **Access Time** | 25 ns | | **Operating Voltage** | 2.7V to 3.6V | | **Package Type** | 32-pin SOIC (Small Outline Integrated Circuit) | | **Data Retention** | 20 Years (minimum) | | **Operating Temp** | 0°C to +70°C (Commercial) | --- ## 2. Core Functional Components ### A. SRAM Control Logic The device operates like a standard high-speed SRAM. During normal operation, the system reads and writes to the SRAM array at speeds of **25ns**. This allows for high-frequency data processing without the wear-and-tear limitations of standard Flash or EEPROM. ### B. Non-Volatile QuantumTrap Cell Every SRAM bit has a corresponding non-volatile cell. When a power failure occurs, the data is automatically transferred from the volatile SRAM to the non-volatile elements. ### C. Power Management (AutoStore) The STK17TA8-RF25 features **AutoStore** technology. By connecting a small capacitor (typically 68µF) to the `VCAP` pin, the device uses the stored energy to "dump" the SRAM data into the non-volatile memory automatically if $V_{CC}$ drops below a safe threshold. --- ## 3. Operational Modes | Mode | Trigger | Description | | :--- | :--- | :--- | | **Read/Write** | Standard Signal | Operates as a 25ns asynchronous SRAM. | | **AutoStore** | Power Loss | Data moves from SRAM to non-volatile memory using the $V_{CAP}$ capacitor. | | **Software Store** | Command Sequence | User initiates a data backup via a specific software sequence. | | **Recall** | Power Up | Data is automatically moved from non-volatile memory back to SRAM. | --- ## 4. Typical Applications * **Industrial Automation:** Storing configuration data and error logs. * **Medical Equipment:** Maintaining calibration data and patient settings. * **Data Servers:** Storing critical "metadata" or write-caches to prevent corruption during power outages. * **Smart Meters:** Recording energy consumption data in real-time. --- ## 5. Pin Configuration (Simplified) ```text +---U---+ VCAP [1] [32] VCC A16 [2] [31] A15 A14 [3] [30] NC A12 [4] [29] /WE ... ... ... ... GND [16] [17] DQ7 +-------+ ``` ---