## STK17TA8-R35: Technical Overview The **STK17TA8-R35** is a high-performance **nvSRAM** (Non-volatile Static Random Access Memory) manufactured by Infineon (formerly Cypress Semiconductor). It combines the speed of an SRAM with the non-volatile data retention of an EEPROM. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Capacity** | 1 Mbit (128K x 8) | | **Interface** | Parallel | | **Access Time** | 35 ns | | **Operating Voltage** | 2.7V to 3.6V | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Package Type** | 32-pin SOIC | | **Data Retention** | 20 Years | --- ### 2. Core Functional Components The device is divided into two primary internal structures that work in tandem: #### A. The SRAM Layer This layer functions like a standard high-speed CMOS static RAM. During normal operation, the system reads and writes to this layer with a **35ns access time**. This allows for unlimited read and write cycles without the wear-out mechanisms found in traditional Flash memory. #### B. The Non-volatile Elements Each SRAM cell is linked to a non-volatile **QuantumTrap** cell. These cells act as a shadow memory. * **STORE Operation:** In the event of power failure or a software command, data is transferred from the SRAM to the non-volatile cells. * **RECALL Operation:** Upon power restoration, the data is automatically copied back from the non-volatile cells to the SRAM. --- ### 3. Management Features * **AutoStore:** The chip includes an internal capacitor-based power monitoring system. If $V_{CC}$ drops below a safe threshold, the device uses energy stored in an external capacitor ($V_{CAP}$) to perform a final write to the non-volatile layer. * **Hardware Protection:** A specific pin allows for hardware write protection to prevent accidental data corruption. * **Infinite Endurance:** Because the non-volatile writes only happen during power-down cycles, the SRAM can be cycled infinitely during normal operation. --- ### 4. Pin Configuration Highlight ```text 32-Pin SOIC Layout (Simplified) +-------+--+-------+ | HSB |1 | 32| Vcc | (Hardware Store Busy) | A16 |2 | 31| A15 | (Address Lines) | A14 |3 | 30| Vcap | (Capacitor for AutoStore) | WE |4 | 29| OE | (Write/Output Enable) | ... |..| ..| ... | +-------+--+-------+ ``` --- ### 5. Common Applications * **Industrial Automation:** Storing configuration parameters and error logs. * **Medical Equipment:** Saving critical patient data or device state during power loss. * **Data Communications:** Managing routing tables and system configurations that require frequent updates but must survive power cycles.