The **7140LA55FGI8** is a high-performance, low-power **Dual-Port Static RAM (SRAM)** manufactured by Renesas Electronics (formerly IDT - Integrated Device Technology). It is specifically designed for applications requiring simultaneous access to a common memory space from two independent ports. --- ## 1. Component Overview The device provides 32,768 bits of memory, organized as **2K x 16**. The "Dual-Port" nature allows two different processors or buses to read and write to the memory at the same time without interference, provided they are not accessing the exact same address simultaneously. ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Type** | SRAM - Dual Port, Asynchronous | | **Memory Size** | 32Kb (2K x 16) | | **Speed (Access Time)** | 55 ns | | **Voltage Supply** | 4.5V ~ 5.5V | | **Interface** | Parallel | | **Operating Temperature** | -40°C ~ 85°C (Industrial Grade) | | **Package / Case** | 64-CQFP (Ceramic Quad Flatpack) | --- ## 2. Part Number Breakdown Understanding the suffix and prefix codes helps identify the specific variant of this chip: * **7140**: Base part number (2K x 16 Dual-Port RAM). * **LA**: Low Power characteristic. * **55**: 55 nanosecond access time (Speed). * **FG**: Package code for a Ceramic Quad Flatpack (CQFP). * **I**: Industrial temperature range (-40°C to +85°C). * **8**: Tape and Reel packaging (shipping format). --- ## 3. Key Functional Features * **True Dual-Ported Memory:** It has two independent sets of addresses, data, and control pins (Left Port and Right Port). * **Hardware Interrupts:** It includes flags to signal one processor when the other has written to a specific "mailbox" location. * **Busy Logic:** It features "BUSY" pins to manage contention if both ports attempt to write to the same memory location at the exact same time. * **Low Power Consumption:** The "LA" version offers significantly reduced power usage during standby mode, which is critical for industrial battery-backed systems. --- ## 4. Common Applications Due to its high reliability and wide temperature range, the 7140LA55FGI8 is typically found in: 1. **Industrial Controllers:** Managing data flow between a main processor and a specialized co-processor. 2. **Telecommunications:** Serving as a buffer for data packets between two different network interfaces. 3. **Aerospace/Military:** The ceramic packaging (FG) provides superior thermal and environmental protection compared to plastic. 4. **Digital Signal Processing (DSP):** Used as a shared memory interface for high-speed data acquisition. ---