7005S55JI8

Overview

The Renesas Electronics Corporation 7005S55JI8 is a high-speed, asynchronous dual-port static random-access memory (SRAM) device. It provides a storage capacity of 64 kilobits organized as 8K words by 8 bits. The component features independent read/write ports allowing simultaneous access to the same memory location without conflict. It operates on a single 5V power supply with a maximum voltage of 5.5V and a minimum of 4.5V. The specified access time for this variant is 55 nanoseconds. The device supports full on-chip hardware semaphore signaling and interrupt flags for port arbitration. It is housed in a 68-pin Plastic Leadless Chip Carrier (PLCC) package suitable for surface-mount installation.

Feature Summary

• True dual-ported architecture enabling simultaneous independent reads and writes from either port
• On-chip hardware support for semaphore signaling and interrupt flags to manage bus arbitration
• Automatic power-down feature controlled by chip enable inputs for low standby power consumption
• TTL-compatible logic levels with a single 5V power supply requirement

Applications

• Stand-alone 64K-bit dual-port RAM systems
• Master/Slave dual-port configurations for 16-bit or wider data bus expansion
• Battery-backed memory applications requiring 2V data retention capabilities
• Industrial control systems operating within standard commercial temperature ranges

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to potential availability constraints. Confirm package integrity upon receipt, as PLCC components require careful handling to prevent lead damage. Check for specific manufacturing date codes if long-term reliability is critical for the application. Ensure that the ordering suffix matches the required pin configuration and speed grade exactly. Review official discontinuation notices to assess long-term supply viability for production planning.

Selection Notes

Select this component when simultaneous bidirectional data transfer is required between two processors or controllers. The 55ns access time suits moderate-speed asynchronous interfaces where higher speeds are unnecessary. Consider the 68-pin PLCC package for prototyping or applications where socketed mounting is preferred over direct soldering. Verify that the system design accommodates the necessary semaphore and interrupt logic for proper port arbitration. Ensure the power supply network can handle the peak current requirements during active switching cycles.

Part Context

The 7005S55JI8 belongs to the Renesas 7005 series of dual-port SRAMs, which are designed for high-performance data buffering and communication between microprocessors. This series is known for its true dual-port capability, allowing non-blocking access to shared memory resources. The device serves as a bridge between different processing domains, facilitating efficient data exchange in complex embedded systems. It replaces earlier generations of dual-port memories with improved integration and lower power consumption characteristics.

Replacement Considerations

Consult official Renesas documentation for qualified substitute part numbers within the 7005 family. Verify that any replacement maintains the same 68-pin PLCC footprint and 55ns access speed. Ensure compatibility with existing semaphore and interrupt logic designs when swapping components.