## IDT7130LA55CB: High-Speed Dual-Port Static RAM The **IDT7130LA55CB** is a high-performance **1K x 8 Dual-Port Static RAM (SRAM)** designed to facilitate independent access to a common memory array. It is specifically engineered for applications requiring asynchronous communication between two microprocessors or buses. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Memory Density** | 8 Kbits (1,024 words x 8 bits) | | **Access Time** | 55 ns | | **Technology** | CMOS (Low Power) | | **Operating Voltage** | 5.0V (±10%) | | **Package Type** | 48-pin Sidebraze DIP (Hermetic) | | **Operating Temperature** | Military Grade (-55°C to +125°C) | | **Suffix "CB"** | Indicates Sidebraze Ceramic DIP package | --- ### 2. Core Electronic Features The IDT7130 architecture includes several specialized features to manage data integrity during simultaneous access: * **Dual-Port Architecture:** It possesses two independent sets of control, address, and I/O pins (Left Port and Right Port). This allows two different systems to read or write to any location in the memory simultaneously. * **Hardware Interrupts:** It features **INTL** (Left) and **INTR** (Right) pins. These act as a communication "mailbox." When one port writes to a specific memory location, it can trigger an interrupt for the other port. * **Busy Logic:** To prevent data corruption during simultaneous writes to the same address, the chip includes **BUSY** logic. It determines which port accessed the address first and signals the other port to wait. * **Low Power Consumption:** The "LA" version denotes a low-power CMOS design, which significantly reduces power during standby mode, crucial for military and aerospace applications. --- ### 3. Pinout and Interface Summary The device utilizes a standard asynchronous SRAM interface for both ports: | Signal Group | Description | |:---|:---| | **A0 - A9** | Address Inputs for 1,024 locations. | | **I/O0 - I/O7** | Data Input/Output lines. | | **CE (Chip Enable)** | Activates the specific port. | | **OE (Output Enable)** | Enables the output drivers during a Read cycle. | | **R/W (Read/Write)** | Determines the direction of data flow. | | **SEM (Semaphore)** | Logic to allow software-level arbitration of shared resources. | --- ### 4. Application Use Cases 1. **Multiprocessor Systems:** Sharing data between a primary CPU and a co-processor or DSP. 2. **Digital Signal Processing:** Buffering high-speed data streams between acquisition hardware and a controller. 3. **Military/Aerospace:** Due to the "CB" (Ceramic) packaging and military temp rating, it is used in flight computers and ruggedized communication gear. ---