70261S35PFI8

Memory IC Overview

The Renesas Electronics Corporation 70261S35PFI8 is a dual-port static random access memory (SRAM) integrated circuit with a storage capacity of 256 kilobits, organized as 16K words by 16 bits. It features asynchronous parallel interface operation with a maximum access time of 35 nanoseconds and a write cycle time of 35 nanoseconds. The device operates on a single 4.5V to 5.5V power supply and supports surface mount installation in a 100-pin TQFP package measuring 14x14 mm. It functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports simultaneous independent access to the same memory location from both ports via true dual-ported memory cells.
• Includes on-chip hardware support for semaphore signaling and port arbitration logic between ports.
• Features automatic power down mode controlled by chip enable signals for low standby power consumption.
• Provides separate upper-byte and lower-byte control for multiplexed bus compatibility.

Memory IC Applications

• Stand-alone dual-port RAM systems
• Master/Slave dual-port RAM configurations for 32-bit or wider word systems
• Industrial embedded memory applications requiring asynchronous data exchange

Memory IC Procurement Notes

This component is officially obsolete and no longer manufactured by Renesas Electronics Corporation. Current availability is limited to existing stock or third-party distributors. Verify end-of-life status and lead times carefully before design finalization. Ensure compliance with RoHS non-compliance requirements if applicable to your project constraints.

Memory IC Selection Notes

Select this part when a high-speed asynchronous dual-port SRAM with 256Kb density is required for industrial environments. Consider the 100-TQFP package constraints and 35ns access speed relative to system timing requirements. Evaluate the need for hardware semaphore support and automatic power-down features for specific power management strategies.

Memory IC Part Context

The 70261 series represents a family of high-speed 16K x 16 dual-port static RAMs designed for versatile memory interfacing. This specific model belongs to the S35 variant, indicating the 35ns speed grade within the asynchronous dual-port architecture. It serves as a bridge for data transfer between different clock domains or processors in complex embedded architectures.

Memory IC Replacement Considerations

The official upgrade substitute is the 70261L20PFGI8. Verify pinout compatibility and electrical parameter differences, particularly the improved 20ns access time, before implementing any substitution in existing designs.