Original Part
SRAM - Synchronous, SDR (ZBT) Memory IC 9Mbit Parallel 150 MHz 3.8 ns 165-CABGA (13x15)
Alternative Part
SRAM - Synchronous, SDR (ZBT) Memory IC 9Mbit Parallel 133 MHz 4.2 ns 165-CABGA (13x15)
SRAM - Synchronous, SDR (ZBT) Memory IC 9Mbit Parallel 7.5 ns 165-CABGA (13x15)
1. Substitution Conclusion for 71V65603S133BQG
From a hardware compatibility standpoint, the 71V65603S133BQG is a viable speed-down substitute for the original part. However, the acceptability of the resulting system performance must be evaluated. The key differences lie in the clock frequency (150 MHz vs. 133 MHz) and access time (3.8 ns vs. 4.2 ns). The substitute's peak data throughput bandwidth (approximately 5.32 Gb/s) is reduced by about 11% compared to the original (~5.98 Gb/s). Furthermore, timing slack for read and write operations will be reduced. If the original system design had ample timing margin at 150 MHz, operation at the down-clocked 133 MHz is typically feasible. Conversely, if the original design's timing was already tight, the substitution could introduce stability issues, necessitating a full re-verification of the timing margins.
2. Substitution Conclusion for 71V65703S75BQG
The 71V65703S75BQG is not a viable direct substitute. The primary reason is its significantly longer access time (7.5 ns vs. 3.8 ns). Furthermore, the part number difference ("657" vs. the original "656") suggests it may be a different revision or incorporate minor internal architectural tweaks. The near-doubling of the access time indicates this device's maximum sustainable operating frequency will be substantially lower than the original (estimated to be in the 70-80 MHz range). This would lead to a severe degradation in system data bandwidth and increased latency, failing to meet the performance requirements of the original 150 MHz clock-based design. Substitution is only conceivable if the system design inherently incorporates very large timing margins and explicitly allows for operation in a significantly down-clocked, low-speed mode.
Analysis ID: 067A-799E000
Based on part parameters and for reference only. Not to be used for procurement or production.
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