7143SA55J8

Overview

The Renesas Electronics Corporation 7143SA55J8 is a high-speed, asynchronous dual-port static random-access memory (SRAM) device. It features a storage capacity of 32 kilobits organized as 2K words by 16 bits. The component supports parallel interface operations with an access time and write cycle time of 55 nanoseconds. It operates on a single 5V power supply within a voltage range of 4.5V to 5.5V. The device is housed in a 68-pin Plastic Leadless Chip Carrier (PLCC) package with J-leads, measuring 24.21mm by 24.21mm. It is designed for surface mount installation and functions within an ambient temperature range of 0°C to 70°C.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location from both ports without conflict.
• Integrated on-chip port arbitration logic manages bus contention automatically, eliminating the need for external discrete logic components.
• Supports versatile byte-level write control for lower and upper bytes, allowing expansion of data bus width to 32 bits or more in master/slave configurations.
• Includes BUSY input functionality to signal port availability and ensure error-free operation during concurrent access attempts.

Applications

• High-speed data buffering in telecommunications systems requiring low-latency packet handling.
• Real-time data acquisition and processing in industrial automation controllers.
• Network switch and router memory buffers for traffic management.
• Embedded systems requiring non-volatile-like speed with volatile density flexibility.

Procurement Notes

This component is officially designated as obsolete and discontinued by the manufacturer. Verification of current stock availability through authorized distributors is required before procurement planning. Sourcing should prioritize verified surplus channels to ensure authenticity. Counterfeit risk assessment is critical due to the end-of-life status. Confirm that the specific suffix J8 corresponds to the 68-PLCC package variant when validating supplier documentation against original datasheets.

Selection Notes

Engineers selecting this part must account for its discontinuation status and plan for long-term supply chain stability. The 55ns access speed defines its performance ceiling for synchronous system integration. Consider the 68-pin PLCC footprint constraints during PCB layout finalization. Verify compatibility with existing 5V logic levels, as TTL-compatible inputs are standard. Evaluate alternative modern dual-port SRAMs if future production volume is anticipated beyond available surplus quantities.

Part Context

The 7143SA series belongs to Renesas' legacy portfolio of high-performance dual-port RAMs, originally developed under Integrated Device Technology (IDT). These devices utilize CMOS technology to provide fast, reliable memory solutions for complex embedded applications. The SA suffix typically denotes the commercial temperature grade and specific package configuration. This series was widely adopted in networking and industrial equipment prior to the shift toward newer integrated memory controllers.

Replacement Considerations

Publicly confirmed substitute part numbers are not explicitly listed in the provided source material. Engineers should consult official Renesas obsolescence notices or contact authorized distributors for validated cross-reference recommendations. Generic pin-compatible alternatives may exist but require rigorous electrical parameter verification to ensure functional equivalence in dual-port arbitration scenarios.