7054L45PRFI

Memory IC Overview

The 7054L45PRFI is a high-speed 4K x 8 FourPort Static RAM manufactured by Renesas Electronics Corporation. It features four independent ports with separate control, address, and I/O pins, allowing simultaneous asynchronous access to any memory location without on-chip hardware port arbitration. The device operates on a single 5V power supply (4.5V to 5.5V) and supports battery backup operation with data retention down to 2V. It is housed in a 128-pin TQFP package and is rated for the industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• True FourPort memory cells enable simultaneous access to the same memory locations from all ports.
• Fully asynchronous operation allows independent reads or writes via separate control, address, and I/O pins for each port.
• Automatic power-down feature controlled by Chip Enable (CE) permits low-power standby mode.
• TTL-compatible single 5V power supply design simplifies integration into existing logic systems.

Memory IC Applications

• Systems requiring multiple processors to access common RAM simultaneously without hardware arbitration.
• Industrial control environments necessitating reliable operation within the -40°C to +85°C temperature range.
• Battery-backed memory applications requiring data retention during main power loss.
• High-speed parallel interface designs utilizing standard TTL-compatible logic levels.

Memory IC Procurement Notes

Verify component authenticity through authorized channels due to potential availability of obsolete or refurbished units. Confirm RoHS compliance status as older variants may not meet current environmental regulations. Validate package integrity upon receipt, ensuring no damage to the 128-pin TQFP leads. Check datasheet revisions for any pinout or electrical characteristic updates prior to final implementation.

Memory IC Selection Notes

Select this component when concurrent multi-port access to shared memory is required without complex arbitration logic. Ensure the system design accommodates the 128-pin TQFP footprint and meets the 4.5V to 5.5V voltage requirements. Consider the industrial temperature rating if the application operates in extreme environments. Verify that the asynchronous nature of the ports aligns with the system timing constraints.

Memory IC Part Context

The 7054 series represents Renesas' high-performance FourPort SRAM family, designed for applications demanding simultaneous multi-master access. The 7054L45PRFI specifically denotes the 45ns speed grade, industrial temperature variant in a TQFP package. This series serves as a critical memory solution for legacy and specialized embedded systems where hardware-based port arbitration is undesirable or unnecessary.

Memory IC Replacement Considerations

Direct substitutes include other 7054 series variants such as 7054L25PRFI for faster access times or 7054S25PRFI for commercial temperature ranges. Cross-reference pinouts and electrical specifications carefully when considering alternative manufacturers' quad-port SRAMs to ensure compatibility with existing board layouts and timing requirements.