For static RAM (SRAM) devices used in digital systems, what supply voltage do most memory chips typically require?

Introduction:
Choosing SRAMs requires awareness of typical power rails. Historically and in many legacy/embedded designs, SRAM ICs were specified for standard logic-level supplies. This item checks recognition of the common nominal supply voltage for mainstream SRAM chips (especially TTL/CMOS-compatible parts).

Given Data / Assumptions:

• Technology: conventional asynchronous SRAMs as found in microprocessor-based systems.
• Answer choices: no supply, 2 V, 5 V, 12 V.

Concept / Approach:

For decades, the de facto supply for TTL-compatible logic and memory has been 5 V. While modern low-power SRAMs exist at 3.3 V or lower, the broad, classic answer remains 5 V for “most” standard SRAM chips from the traditional catalogs.

Step-by-Step Solution:

Verification / Alternative check:

Review of representative SRAM datasheets (e.g., 6264, 62256 families) shows Vcc = 5 V ± tolerance.

Why Other Options Are Wrong:

2 V – below typical operating ranges; 12 V – used for programming certain memories, not SRAM supply; 'no supply' – impossible.

Common Pitfalls:

Generalizing modern low-voltage SRAMs to all SRAMs; conflating EPROM/Flash programming voltages with SRAM operation.

Final Answer:

need 5 V supply