Infineon Technologies CY7C024AV-20AXCT

Overview

CY7C024AV-20AXCT from Cypress Semiconductor is a 4K × 16-bit true dual-port static RAM with asynchronous operation, 20 ns access time, 3.3 V supply, and integrated arbitration logic for interprocessor communication in real-time embedded systems. It supports simultaneous independent read/write access to the same memory location via left and right ports, features on-chip semaphores and INT flags for software handshaking, and operates across commercial temperature range (0°C to +70°C).

For engineers reviewing the CY7C024AV-20AXCT datasheet, CY7C024AV-20AXCT pinout, CY7C024AV-20AXCT application, or CY7C024AV-20AXCT equivalent, key selection criteria include dual-port arbitration timing (tPS = 5 ns), BUSY/INT flag behavior under contention, M/S pin configuration for 32-bit expansion, and standby current of 10 µA at CMOS-level CE.

Technical Context

The device implements fully asynchronous dual-port architecture with independent CE, R/W, and OE controls per port, enabling deterministic read/write interleaving without clock synchronization. Arbitration is resolved by on-chip logic that asserts BUSY within 5 ns (tPS) of address match, with tBLA = 8 ns and tBLC = 10 ns propagation delays determining port priority.

Semaphore operation uses eight dedicated latches accessed via SEM pin with A0–A2 addressing; only IO0L/IO0R transfers semaphore data, and tSOP = 15 ns minimum deassertion delay ensures latch stability before read verification. Interrupts are generated by writes to FFEh (left mailbox) or FFFh (right mailbox), cleared only upon owner-read, and suppressed during active BUSY assertion.

Key Specifications

Pinout & Package

100-pin Thin Quad Flat Pack (TQFP), 14 mm × 14 mm body, 0.5 mm lead pitch, exposed pad not electrically connected. Pin 1 marked by dot; pins numbered counterclockwise from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L20PF and IS61WV25616EDBLL-20BLI, CY7C024AV-20AXCT uniquely integrates hardware semaphore latches, mailbox-triggered interrupts, and master/slave expansion-reducing BOM count and firmware complexity in tightly coupled multiprocessor designs.

Availability

CY7C024AV-20AXCT is available at Aetrix Electronics and suitable for industrial PLC communication buffers, dual-processor real-time control systems, and telecom line card status memory requiring stable component supply and long-term lifecycle assurance.

Supply support for CY7C024AV-20AXCT 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 markets.

The CY7C024AV belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in hard real-time embedded systems with minimal external logic.

FAQ

What is the minimum pulse width required for CE to guarantee valid access?

The CY7C024AV-20AXCT requires CE low pulse width ≥ 20 ns for reliable access initiation. This aligns with its 20 ns access time specification and ensures internal address latching and sense amplifier activation complete before data sampling. Shorter pulses may cause metastability in arbitration logic or incomplete memory cell access, especially under worst-case voltage/temperature conditions.

How does the M/S pin affect BUSY pin behavior during contention?

When M/S = HIGH, BUSY is an output reflecting local arbitration result; when M/S = LOW, BUSY becomes an input accepting arbitration outcome from a master device. In slave mode, the device waits for BUSY input to settle (tBLC = 10 ns) before initiating writes-preventing erroneous access during cascaded contention resolution. This eliminates need for external BUSY gating logic in 32-bit configurations.

Can semaphore latches be accessed while CE is asserted low?

No-semaphore access requires CE = HIGH and SEM = LOW simultaneously. The datasheet explicitly states "CE must remain HIGH during SEM LOW." Asserting CE low disables all internal memory and semaphore paths; attempting semaphore read/write with CE low results in undefined outputs and potential bus contention due to floating IO lines.

What happens if both ports attempt to write to the same mailbox location simultaneously?

Arbitration logic grants access to one port based on tPS timing window; the winning port's write succeeds and triggers INT to the opposite port, while the losing port's write is blocked and BUSY asserts. The mailbox retains only the winning port's data-no data corruption occurs, but the losing port must retry after BUSY deasserts and verify mailbox state via subsequent read.