7143SA35GB

Overview

The Renesas Electronics Corporation 7143SA35GB is a high-speed, 32Kbit (2K x 16) dual-port static random-access memory (SRAM). It features asynchronous parallel interface operation with a maximum access time of 35 nanoseconds. The device operates on a single 5V power supply, ranging from 4.5V to 5.5V. It utilizes true dual-ported memory cells allowing simultaneous independent access to the same location. The component is housed in a 68-pin PGA package with dimensions of 29.46mm by 29.46mm.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to identical memory locations without conflict.
• On-chip port arbitration logic manages bus contention automatically, eliminating the need for external discrete control circuitry.
• Supports versatile write control for separate upper and lower bytes, facilitating expansion to 32-bit or wider data buses via SLAVE mode.
• Fully asynchronous operation from either port ensures flexible timing integration within complex system designs.

Applications

• High-speed data buffering in telecommunications equipment
• Cache memory implementation in embedded processing systems
• Dual-processor shared memory architectures requiring concurrent access
• Industrial control systems needing fast, reliable volatile storage

Procurement Notes

Verify component authenticity through authorized channels as this part is obsolete. Confirm RoHS compliance status, as older batches may not meet current environmental standards. Check for moisture sensitivity level handling requirements during assembly. Ensure pin compatibility with existing PCB footprints before procurement. Validate that the specific suffix matches required thermal and electrical specifications.

Selection Notes

Select this component when simultaneous bidirectional data access is critical for system performance. Consider the 68-pin PGA package constraints for board layout and thermal management. Evaluate if the 35ns access time meets the target clock speeds. Assess power consumption against available supply capabilities. Determine if the TTL-compatible voltage levels align with interfacing logic families.

Part Context

This device belongs to the IDT/Renesas 7143 series of dual-port SRAMs. It shares architectural similarities with the 7133 series but offers higher density. The series is known for robust arbitration logic and battery backup support. It serves as a legacy solution for applications requiring deterministic dual-port behavior without external logic overhead.

Replacement Considerations

Public confirmed substitute: 7133SA90GB. Verify pinout and speed compatibility before substitution. Note that alternative packages may require adapter solutions.

FAQ

How does the 7143SA35GB handle simultaneous writes to the same address?

The device uses on-chip port arbitration logic to manage conflicts. If both ports attempt to write simultaneously, one port is granted priority while the other is stalled until the first operation completes.

Can the 7143SA35GB be used in a 32-bit wide memory system?

Yes, by utilizing the SLAVE mode feature, multiple devices can be cascaded to expand the data bus width to 32 bits or more while maintaining full-speed operation.

What is the purpose of the BUSY input pin?

The BUSY input allows an external master to stall a slave port's access, ensuring controlled data transfer sequences and preventing race conditions in complex multi-master environments.