71321LA55PF8

Memory IC Overview

The 71321LA55PF8 is a high-speed 16Kb (2K x 8) dual-port static RAM manufactured by Renesas Electronics Corporation. It features asynchronous parallel interface with a 55 ns access time and operates on a single 5V ±10% power supply. The device utilizes CMOS technology and supports battery backup operation with data retention down to 2V. It is housed in a 64-TQFP surface-mount package and is designed for interprocessor communications using internal interrupt logic.

Memory IC Feature Summary

• True dual-ported memory cells allow simultaneous independent access to the same memory location from both ports without conflict.
• Integrated internal interrupt flags facilitate direct port-to-port communication, eliminating the need for external discrete logic for basic signaling.
• Automatic power-down feature controlled by chip enable inputs allows the on-chip circuitry to enter a very low standby power mode.

Memory IC Applications

• Stand-alone 8-bit dual-port random access memory systems
• Master dual-port RAM configuration in 16-bit or wider word width systems when paired with slave devices
• Interprocessor communication interfaces requiring automatic arbitration

Memory IC Procurement Notes

This component has reached end-of-life status and is no longer manufactured by Renesas Electronics Corporation. Verification of availability should focus on obsolete stock or surplus channels rather than standard distribution. Buyers must confirm the specific revision level and packaging condition, as original manufacturer support is discontinued. Replacement strategies should prioritize the recommended upgrade paths provided by the manufacturer to ensure functional compatibility.

Memory IC Selection Notes

Select this part only if the specific 55 ns speed grade and 64-TQFP package are required for legacy designs. Verify that the system voltage requirements align with the 4.5V to 5.5V operating range. Consider the industrial temperature range options if environmental conditions exceed commercial limits. Ensure that the design can accommodate the transition to newer generation parts if long-term supply stability is a critical constraint.

Memory IC Part Context

The 71321 series belongs to Renesas' high-speed dual-port SRAM family, originally developed under IDT branding before acquisition. These devices are engineered for applications demanding concurrent read/write operations from two distinct processors. The 'LA' suffix indicates the inclusion of battery backup capabilities, distinguishing it from standard variants. This specific model represents an older generation within the 71321 product line.

Memory IC Replacement Considerations

The official upgrade substitute is 71321LA20PFG8. This replacement offers faster 20 ns access times while maintaining pin compatibility and functional equivalence. Designers should verify that the increased speed does not introduce timing violations in existing circuits and confirm package dimension consistency.