7143LA35J

Overview

The Renesas Electronics Corporation 7143LA35J is a high-speed, 32K-bit (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 within a voltage range of 4.5V to 5.5V. It is housed in a 68-pin Plastic Leadless Chip Carrier (PLCC) package designed for surface-mount technology. The component supports simultaneous independent access from two ports and includes on-chip arbitration logic.

Feature Summary

• True dual-ported architecture enabling simultaneous read/write access to the same memory location from both ports without conflict.
• Integrated port arbitration logic manages bus contention automatically, eliminating the need for external discrete control circuitry.
• Supports battery backup operations with data retention capabilities down to 2V, ensuring data integrity during power transitions.

Applications

• High-performance digital signal processing systems requiring concurrent data access
• Telecommunications equipment utilizing master/slave dual-port configurations
• Industrial automation controllers needing reliable volatile storage with fast cycle times

Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm package integrity as moisture sensitivity level indicates potential degradation if packaging was compromised. Check for original manufacturer markings consistent with IDT or Renesas branding. Validate datasheet revisions to ensure compatibility with current design requirements before finalizing procurement decisions.

Selection Notes

Select this component when simultaneous bidirectional data transfer is required between two processors or buses. The 35ns speed suits applications demanding rapid response times. Ensure the system design accommodates the 68-pin PLCC footprint and 5V logic levels. Consider the dual-port capability over standard single-port SRAMs if complex handshake protocols are undesirable.

Part Context

This part belongs to the 7143 series of dual-port SRAMs originally developed by Integrated Device Technology (IDT) and later acquired by Renesas Electronics. The series is characterized by its true dual-port functionality and TTL-compatible inputs. The 7143LA35J specifically denotes the commercial temperature grade variant with 35ns access speed in the PLCC package.

Replacement Considerations

• 7143SA35J
• 7143LA25J

FAQ

How does the device handle simultaneous access requests from both ports?

The 7143LA35J utilizes on-chip port arbitration logic to manage conflicts. If both ports attempt to write to the same address simultaneously, the arbitration circuit ensures orderly execution without data corruption.

Is the 7143LA35J compatible with 3.3V logic levels?

No, the device requires a single 5V power supply (4.5V to 5.5V) and features TTL-compatible inputs. It is not directly compatible with 3.3V logic without level shifting.