Original Part
SRAM - Synchronous, SDR (ZBT) Memory IC 9Mbit Parallel 7.5 ns 165-CABGA (13x15)
Alternative Part
SRAM - Synchronous, SDR (ZBT) Memory IC 9Mbit Parallel 150 MHz 3.8 ns 165-CABGA (13x15)
SRAM - Synchronous, SDR Memory IC 9Mbit Parallel 117 MHz 7.5 ns 165-TFBGA (13x15)
1. Substitution Conclusion for 71V65603S150BQGI8
From a technical parameter perspective, the 71V65603S150BQGI8 is a direct and superior replacement. It belongs to the same Renesas ZBT architecture family as the original part (71V65703S75BQG8), with identical core specifications (density, organization, voltage, and package). The primary difference is its significantly higher performance (3.8 ns vs. 7.5 ns access time, 150 MHz clock frequency). This device is essentially a performance-upgraded version of the same series, offering faster read/write speeds and higher data throughput in the same system. Provided that pinout definitions and key timing parameters (such as latency) are confirmed to be compatible with the original design, it can be directly substituted to enhance system performance. However, note that the faster timing may impose stricter requirements on PCB layout.
2. Substitution Conclusion for IS64LF25636A-7.5B3LA3-TR
The feasibility of using the IS64LF25636A-7.5B3LA3-TR as a direct replacement is low, with the primary risk stemming from a different core architecture. While its basic parameters (density, organization, voltage, package, and access time) match the original part, the critical difference lies in its technology: it is a standard "Synchronous SDR" device, whereas the original part is a "Synchronous SDR (ZBT)". ZBT (Zero Bus Turnaround) is a specialized pipelined architecture designed to eliminate idle cycles between read and write operations, representing a fundamental difference in timing control protocol compared to standard synchronous SRAMs. The two are incompatible in terms of read/write timing, control signal interaction, and bus efficiency. A direct substitution would cause the system to malfunction, necessitating a redesign of the controller logic or modification of the driver software.
Analysis ID: D681-AEAD000
Based on part parameters and for reference only. Not to be used for procurement or production.
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