Infineon Technologies CY7C024AV-25AC

Overview

CY7C024AV-25AC from Cypress Semiconductor is a 3.3V, 4K × 16 true dual-port static RAM with simultaneous independent access on left and right ports, 25 ns maximum access time, 115 mA typical active current, and 10 μA typical CMOS standby current. It implements on-chip arbitration, semaphores, and INT flags for interprocessor communication in real-time embedded systems requiring deterministic memory coherency.

For engineers reviewing the CY7C024AV-25AC datasheet, CY7C024AV-25AC pinout, CY7C024AV-25AC application, or CY7C024AV-25AC equivalent, key selection criteria include dual-port contention resolution timing (tPS = 15 ns), BUSY/INT/SEM signal behavior, master/slave expansion capability via M/S pin, and TQFP-100 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

This device integrates two fully asynchronous memory interfaces sharing a single 4K × 16-bit SRAM array, with dedicated address buses (A0L–A11L / A0R–A11R), data buses (I/O0L–I/O15L / I/O0R–I/O15R), and control sets (CEL/OEL/R/WL and CER/OER/R/WR). Arbitration logic resolves port collisions using BUSY assertion with tBLA = 8 ns and tBLC = 10 ns timing windows.

Semaphore latches (8 total) operate independently of main memory, accessed via SEML/SEMR with A0–A2 addressing and controlled by OE/R/W; each semaphore enforces exclusive resource ownership through write-zero/read-back validation. The M/S pin configures BUSYL as output (master) or input (slave), enabling 32-bit expansion without external logic.

Key Specifications

Pinout & Package

Package: 100-pin Lead (Pb)-free Thin Quad Flat Pack (TQFP), 14 mm × 14 mm body, 0.5 mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with IDT70V25L25PF, CY7C024AV-25AC delivers hardware-accelerated coherency with no BOM increase; versus CY7C028AV-25AC, it offers optimal cost/power trade-off for fixed 4K buffer requirements without over-provisioning memory.

Availability

CY7C024AV-25AC is available at Aetrix Electronics and suitable for industrial PLC backplanes, dual-core DSP data exchange, and telecom line card status buffering requiring stable component supply across extended product lifecycles.

Supply support for CY7C024AV-25AC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) designs high-reliability memory and programmable solutions for industrial, automotive, and communications infrastructure.

CY7C024AV belongs to the CY7C02xAV dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems with strict timing and coherency requirements.

FAQ

What is the minimum pulse width required for R/WL to guarantee a valid write cycle?

The CY7C024AV-25AC requires R/WL pulse width ≥ 12 ns for reliable write initiation. This is derived from tWH = 6 ns (minimum high time) and tWL = 6 ns (minimum low time) specified in the AC timing table. Pulse widths below this threshold risk incomplete latch capture, leading to corrupted data writes or metastability in the internal write control path.

How does the semaphore acquisition sequence prevent race conditions between ports?

Semaphore acquisition uses atomic read-modify-write: Port A writes 0 to semaphore address, then reads back. Only if it reads 0 does it gain ownership; otherwise, it retries. The internal latch ensures only one port succeeds per attempt, and tSPS = 10 ns prevents simultaneous arbitration failure - guaranteeing exclusive access without software intervention.

Can the CY7C024AV-25AC operate with mixed voltage I/O (e.g., 3.3V core, 1.8V interface)?

No. The device is strictly 3.3V-only: VCC must be 3.3 V ± 0.3 V, and all I/O pins (I/O0L–I/O15L/R, control signals) are referenced to this supply. Applying 1.8V logic violates VIH/VIL thresholds and risks latch-up or parametric failure per Absolute Maximum Ratings (VCC – 0.5 V ≤ VI ≤ VCC + 0.5 V).

What happens if both ports attempt to write to the same address within the tPS window?

When address match occurs within tPS = 15 ns, on-chip arbitration asserts BUSY on the losing port within tBLA = 8 ns, blocking its access until BUSY deasserts. The winning port completes the write unimpeded. If tPS is violated, arbitration remains deterministic but BUSY assertion timing shifts to tBLC = 10 ns after CE assertion - no data corruption occurs.