## IDT7130LA55P Overview The **IDT7130LA55P** is a high-speed **1K x 8 Dual-Port Static RAM (SRAM)**. It is designed to be used in systems where two independent processors or controllers need to access a shared memory space simultaneously without conflict. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Capacity** | 8 Kbits (1,024 words × 8 bits) | | **Access Time** | 55 ns (Nanoseconds) | | **Package Type** | PDIP-48 (Plastic Dual In-line Package) | | **Power Consumption** | "LA" version (Low Power) | | **Supply Voltage** | 5.0V (±10%) | | **Operating Current** | ~110 mA (Active) / 3 mA (Standby) | --- ### 2. Functional Pin Description The IDT7130 features two identical sets of control, address, and I/O pins, labeled as **Left Port** and **Right Port**. * **A0L - A9L / A0R - A9R**: Address inputs for the Left and Right ports. * **I/O0L - I/O7L / I/O0R - I/O7R**: Data Input/Output lines. * **CE (Chip Enable)**: Activates the specific port. * **OE (Output Enable)**: Controls the output buffers. * **R/W (Read/Write)**: Determines if the operation is a read or write. * **BUSY**: Hardware signal used to indicate that the other port is currently writing to the same address. * **INT (Interrupt)**: Used for communication between processors (mailbox signaling). --- ### 3. Core Features #### Dual-Port Architecture Unlike standard SRAM, this chip allows two separate buses to connect to it. Internal arbitration logic manages the "collision" if both ports try to write to the same memory location at the exact same time. #### Interrupt Logic (Mailbox) The chip includes a "mailbox" feature. If the Left port writes to a specific memory address (0x3FF), it can trigger an interrupt flag for the Right port, signaling that data is ready to be read. #### Low Power (LA Series) The "LA" suffix indicates the low-power version of the chip, which is ideal for battery-backed systems or heat-sensitive applications. --- ### 4. Part Number Decoder ```text IDT 7130 LA 55 P | | | | | | | | | +-- Package: PDIP (Plastic Dual In-line) | | | +------ Speed: 55ns Access Time | | +----------- Power: Low Power | +------------------ Model: 1K x 8 Dual-Port SRAM +----------------------- Manufacturer: Integrated Device Technology (Renesas) ``` --- ### 5. Common Applications * **Inter-processor communication**: Sharing data between a DSP and a Microcontroller. * **Buffered peripherals**: Serving as a high-speed buffer for network controllers. * **Video Memory**: Synchronizing data between a CPU and a display driver.