Difficulty: Easy
Correct Answer: 350 mW and 5 mW respectively
Explanation:
Introduction:
Dynamic RAM (DRAM) consumes significantly more power during active access (row/column activation, refresh) than when placed in standby/idle modes. This question checks recognition of the order-of-magnitude difference between active and standby power.
Given Data / Assumptions:
Concept / Approach:
Active DRAM cycles involve wordline and bitline charging/discharging plus sense amplifiers and refresh logic, leading to higher mW consumption. In standby, only retention/refresh and minimal biasing are maintained, drastically reducing power.
Step-by-Step Solution:
Verification / Alternative check:
Vendor datasheets historically list active power in the several-hundred mW range and standby in the few-mW to tens-of-mW range depending on density and process.
Why Other Options Are Wrong:
'350 mW each' and '5 mW each' ignore mode-dependent differences; '350 mW and 100 mW' understates the standby reduction.
Common Pitfalls:
Assuming standby equals zero; overlooking self-refresh vs. active-refresh nuances, which still remain far below active power.
Final Answer:
350 mW and 5 mW respectively
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