### STK14D88-R25 Technical Overview The **STK14D88-R25** is a high-performance **256Kb (32K x 8) nvSRAM** (non-volatile Static Random Access Memory) manufactured by Cypress Semiconductor (now Infineon). It combines the high-speed performance of an SRAM with the non-volatile storage capabilities of an EEPROM. --- ### Key Specifications | Parameter | Specification | | :--- | :--- | | **Density** | 256 Kbit (32K x 8 bits) | | **Speed (Access Time)** | 25 ns | | **Supply Voltage** | 2.7V to 3.6V (3.3V typical) | | **Interface** | Parallel (32-pin) | | **Package Type** | 32-pin SOIC / 32-pin CDIP | | **Operating Temperature** | Commercial (0°C to 70°C) or Industrial (-40°C to 85°C) | | **Data Retention** | 20 Years | --- ### Core Functionality The device consists of two primary functional components integrated into a single chip: 1. **SRAM Cell:** Used for standard high-speed read/write operations. It has unlimited write endurance while powered. 2. **Non-Volatile Element (QuantumTrap):** A shadow EEPROM cell paired with every SRAM cell. In the event of power loss, the data is automatically transferred from the SRAM to the non-volatile element. #### Power Management Features * **STORE Operation:** Transfers data from SRAM to non-volatile memory. This happens automatically on power-down (**AutoStore**) using a small capacitor, or can be triggered by software. * **RECALL Operation:** Transfers data from non-volatile memory back to the SRAM. This occurs automatically upon power-up (**Power-Up Recall**). --- ### Typical Pin Configuration (32-pin SOIC) | Pin Name | Function | | :--- | :--- | | **A0 - A14** | Address Inputs | | **DQ0 - DQ7** | Data Inputs/Outputs | | **$\overline{CE}$** | Chip Enable | | **$\overline{WE}$** | Write Enable | | **$\overline{OE}$** | Output Enable | | **$V_{CAP}$** | Capacitor connection for AutoStore | | **$V_{CC}$** | Power Supply (3.3V) | | **$V_{SS}$** | Ground | --- ### Applications The STK14D88-R25 is ideal for systems that require frequent high-speed updates but cannot afford to lose data during a power failure: * **Industrial Automation:** Storing machine states and calibration data. * **Data Logging:** Recording error logs or sensor data. * **Medical Electronics:** Patient monitoring settings. * **RAID Controllers:** Cache metadata storage.