Which statement best describes EPROM (Erasable Programmable Read-Only Memory) devices?

Introduction / Context:
EPROM is a nonvolatile memory technology that can be erased and reprogrammed, but it requires a special erasure process. Identifying the correct erasure method helps distinguish EPROM from PROM, EEPROM, and Flash memory.

Given Data / Assumptions:

• EPROM packages often include a quartz window.
• Erasure requires exposure to ultraviolet light of the proper wavelength and duration.
• After erasure, the device can be reprogrammed electrically.

Concept / Approach:
Unlike OTP PROM, EPROM is erasable. The stored charge on floating gates is neutralized by UV exposure through the window, returning cells to the erased state. Shorting inputs to ground does nothing to remove the stored charge on the floating gates.

Step-by-Step Solution:
Identify that EPROM is erasable and reprogrammable.Select the method: ultraviolet light exposure erases contents.Reject statements implying one-time programming or electrical shorting erasure.

Verification / Alternative check:
EPROM datasheets specify UV wavelength (often 253.7 nm) and exposure times for complete erasure and include handling precautions to prevent accidental UV exposure.

Why Other Options Are Wrong:
Option A: Describes PROM (one-time programmable), not EPROM.Option C: Shorting inputs does not erase floating-gate charge.Option D: Cannot be correct because A and C are incorrect.Option E: Nonvolatile memory does not self-erase on power loss.

Common Pitfalls:
Confusing EPROM with EEPROM or Flash, which are electrically erasable. EPROM specifically requires UV exposure to erase.

Final Answer:
EPROMs can be erased by ultraviolet light