7142SA55L48B

Overview

The Renesas Electronics Corporation 7142SA55L48B is a high-speed 16K-bit (2K x 8) dual-port static random-access memory (SRAM). It features an asynchronous parallel interface with a maximum access time of 55 nanoseconds. The device operates on a single 5V power supply within the 4.5V to 5.5V range and supports battery backup data retention down to 2V. It is housed in a 48-pin Leadless Ceramic Chip Carrier (LCC) package designed for surface-mount installation.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access by two processors to the same memory location without conflict.
• Integrated BUSY input flag mechanism to manage arbitration and prevent bus contention during simultaneous accesses.
• Automatic power-down feature controlled by chip enable inputs, allowing circuitry to enter low standby power mode when inactive.
• TTL-compatible logic levels supporting direct interfacing with standard digital systems using a single 5V supply.

Applications

• High-speed data buffering in communication systems requiring full-duplex transfer.
• Cache memory implementation in embedded processing architectures.
• Shared memory interfaces between multiple microprocessors or digital signal processors.
• Real-time control systems utilizing master-slave dual-port configurations.

Procurement Notes

Verify component authenticity through authorized distributors as this part may be discontinued. Confirm RoHS compliance status, as older variants often lack lead-free certification. Validate package integrity upon receipt, ensuring no pin damage or contamination. Review datasheet revisions for any parameter updates prior to integration into final designs.

Selection Notes

Select this component for applications requiring true simultaneous read/write access from two distinct masters. Ensure system voltage remains within the specified 4.5V to 5.5V range for reliable operation. Consider the 48-pin LCC package constraints for PCB layout and thermal management. Verify that the 55ns access speed meets the timing requirements of the host processor interface.

Part Context

This device belongs to the 7142 series of dual-port SRAMs manufactured by Renesas Electronics. It serves as a slave memory unit in wider word-width systems when paired with master devices like the 7132 series. The series provides non-volatile-like performance with volatile storage characteristics, offering high-speed data handling capabilities for complex embedded environments.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate cross-reference options based on identical pinout, capacity, and speed specifications. Verify compatibility with existing board layouts and electrical parameters before substituting.