71V65803S150BG

Overview

The IDT71V65803S150BG is a 9-Mbit synchronous static random-access memory (SRAM) integrated circuit manufactured by Renesas Electronics Corporation. It utilizes Zero Bus Turnaround (ZBT) technology to achieve high-speed parallel data transfer with a maximum clock frequency of 150 MHz and an access time of 3.8 ns. The device features a 512K x 18 memory organization, providing efficient data handling for wide-bus applications. It operates within a supply voltage range of 3.135V to 3.465V and is housed in a 119-pin Plastic Ball Grid Array (PBGA) package measuring 14x22 mm. Designed for surface-mount installation, it supports an industrial operating temperature range from -40°C to +85°C.

Feature Summary

• Employs Zero Bus Turnaround (ZBT) synchronous architecture to minimize bus turnaround latency and maximize throughput efficiency.
• Supports pipelined burst read operations for continuous high-speed data streaming without wait states.
• Features independent byte write controls allowing selective modification of data bytes within the 18-bit word width.

Applications

• High-performance networking equipment requiring low-latency packet buffering
• Digital signal processing systems needing rapid data storage and retrieval
• Industrial automation controllers utilizing wide-data bus architectures

Procurement Notes

This component is officially designated as obsolete and no longer in production by Renesas Electronics Corporation. Verification of authenticity is critical when sourcing remaining stock from third-party distributors, as counterfeit risks increase with end-of-life parts. Buyers must confirm the specific suffix 'BG' corresponds to the 119-PBGA package and 150MHz speed grade, as generic listings may omit these vital identifiers. Supply chain continuity planning should prioritize qualified replacement alternatives immediately.

Selection Notes

Engineers selecting this part must account for its discontinued status and ensure compatibility with existing 3.3V logic levels. The 119-PBGA footprint requires specialized PCB design considerations for thermal management and solder joint reliability compared to standard QFP packages. Designers should verify that the 512K x 18 organization aligns precisely with their system's data bus width to avoid complex interface bridging or unused pin configurations.

Part Context

The 71V65803 belongs to the IDT 71V65xxx family of ZBT SRAMs, which were widely adopted in telecommunications and computing infrastructure during the early 2000s. This specific model represents the 150MHz performance tier within the 9-Mbit capacity segment. It serves as a bridge between traditional asynchronous SRAMs and faster Double Data Rate (DDR) solutions, offering simpler interface timing requirements while maintaining high bandwidth for parallel data processing tasks.

Replacement Considerations

Direct pin-to-pin replacements are limited due to the obsolescence of the entire 71V65803 series. Potential substitutes include the 71V65803S133BQI, though it offers a lower 133MHz clock speed. Engineers must evaluate if the reduced performance meets system timing margins. Alternative modern SRAMs may require significant schematic and layout redesigns due to differing pinouts and interface protocols.