71321LA25JGI8

Memory IC Overview

The 71321LA25JGI8 is a high-speed 16 Kbit (2K x 8) dual-port static random-access memory manufactured by Renesas Electronics. It operates asynchronously with a maximum access time of 25 ns and supports a single 5V ±10% power supply. The device features true dual-ported memory cells allowing simultaneous access to the same location, on-chip port arbitration logic, BUSY output flags, and two interrupt flags for interprocessor communication. It includes an automatic power-down feature controlled by chip enable inputs and supports battery backup operation with data retention down to 2V. The component is housed in a 52-pin PLCC package and functions as a standalone 8-bit dual-port RAM or as a master unit in expanded systems.

Memory IC Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to shared memory locations from both ports without conflict.
• Integrated interrupt logic providing two dedicated flags for efficient processor-to-processor communication and status signaling.
• Automatic low-power standby mode activated by chip enable signals to minimize energy consumption during idle periods.
• Battery backup capability ensuring data retention at voltages as low as 2V for critical information preservation.

Memory IC Applications

• Interprocessor communication interfaces requiring fast, reliable data exchange between multiple microprocessors.
• Master-slave dual-port RAM configurations expanding data bus width to 16 bits or more without discrete logic.
• Real-time control systems utilizing asynchronous parallel memory for high-speed data buffering and processing.

Memory IC Procurement Notes

Verify the specific suffix JGI8 against official Renesas documentation to confirm package type and temperature range compatibility. Confirm RoHS compliance status and moisture sensitivity level requirements prior to integration. Check for obsolescence notices or lifecycle changes as this series may have limited availability. Ensure voltage levels match the 5V ±10% specification to prevent damage.

Memory IC Selection Notes

Select this component when a high-speed asynchronous dual-port SRAM with integrated interrupt logic is required for multi-processor systems. It is suitable for applications needing simultaneous read/write access to shared memory without external arbitration hardware. Consider the 52-pin PLCC package constraints and industrial temperature range (-40°C to +85°C) for environmental suitability. Evaluate power consumption needs given the automatic power-down feature capabilities.

Memory IC Part Context

The 71321LA25JGI8 belongs to the Renesas 71321 series of high-speed dual-port static RAMs. This family is designed for applications requiring fast, error-free data sharing between processors. The LA variant specifically denotes 5V TTL-compatible operation with battery backup support. The series supports expansion into wider data buses when paired with slave devices like the 71421, maintaining full-speed operation without additional discrete logic components.

Memory IC Replacement Considerations

The IDT71321LA25JI is listed as an alias part number for this component. Verify pinout and electrical specifications compatibility before substitution. No other direct substitutes are confirmed in the provided documentation.