Infineon Technologies CY7C024-55AXCT

Overview

CY7C024-55AXCT from Cypress Semiconductor is a 4K × 16-bit true dual-port static RAM with independent left/right ports, 55 ns access time, on-chip semaphore logic, and BUSY/INT flags for interprocessor communication-used in real-time embedded multiprocessor systems requiring deterministic shared-memory arbitration.

For engineers reviewing the CY7C024-55AXCT datasheet, CY7C024-55AXCT pinout, CY7C024-55AXCT application, or CY7C024-55AXCT equivalent, this device supports simultaneous asynchronous reads/writes to same address, master/slave expansion to 32-bit bus width, and mailbox-style port-to-port messaging via dedicated interrupt flag registers.

Technical Context

The CY7C024-55AXCT implements fully asynchronous dual-port architecture with separate CE/R/W/OE controls per port, enabling independent read/write cycles without clock synchronization. It integrates eight hardware semaphores for resource locking and uses on-chip arbitration to resolve contention when both ports access the same memory location within tPS (15 ns).

Its M/S pin configures the device as master (BUSY output) or slave (BUSY input), enabling seamless 32-bit data bus expansion without external logic. The INT flag operates using two dedicated mailbox addresses (0xFFE and 0xFFF), with interrupt generation triggered by write-to-mailbox and cleared only upon read-by-owner.

Key Specifications

Pinout & Package

Available in 84-pin PLCC (plastic leaded chip carrier) package with gull-wing leads, RoHS-compliant Pb-free finish, and 0.05-inch pitch - suitable for through-hole prototyping and high-reliability industrial PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L25PF and IS61LV25616AL, the CY7C024-55AXCT uniquely delivers 5V-compatible dual-port operation with integrated semaphores and BUSY arbitration - essential for deterministic real-time multiprocessor systems without added glue logic.

Availability

CY7C024-55AXCT is available at Aetrix Electronics and suitable for industrial PLC communication buffers, real-time video frame buffering, dual-core embedded debug interfaces, and avionics data logger buffers requiring stable component supply across extended production lifecycles.

Supply support for CY7C024-55AXCT 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) is a U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.

The CY7C024 series belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems with strict timing and arbitration requirements.

FAQ

What is the function of the M/S pin on CY7C024-55AXCT?

The M/S (Master/Slave) pin configures the device's BUSY pin behavior: when HIGH, BUSY functions as an output indicating local arbitration result (master mode); when LOW, BUSY becomes an input accepting arbitration signals from another device (slave mode). This enables direct daisy-chaining of multiple CY7C024 devices for 32-bit or wider data bus expansion without external logic.

How does the semaphore mechanism prevent resource conflicts between ports?

The CY7C024-55AXCT provides eight dedicated hardware semaphore latches. Each port asserts SEML or SEMR to access them, writing '0' to claim and '1' to release. Only the side that successfully writes '0' gains exclusive control - the other port reads '1' and must poll until released. This atomic hardware lock eliminates software race conditions in shared peripheral access.

Can both ports read the same memory location simultaneously without contention?

Yes - the CY7C024-55AXCT supports true simultaneous reads from the same address on both ports with no arbitration delay or BUSY assertion. Contention occurs only during simultaneous read/write or write/write to the same location, triggering BUSY to defer the losing port's access until the winning port completes its cycle.

What are the voltage and timing requirements for reliable interrupt flag operation?

The INTL/INTR pins are open-drain outputs requiring external 4.7 kΩ pull-up to 5 V. An interrupt is generated when one port writes to the other port's mailbox address (0xFFE for left, 0xFFF for right), and cleared only when the owning port reads that address. BUSY must be inactive (HIGH) during mailbox read to ensure interrupt reset occurs reliably.