Infineon Technologies CY7C024-25AXCT

Overview

CY7C024-25AXCT from Cypress Semiconductor is a 4K × 16-bit true dual-port static RAM with independent left/right ports, on-chip arbitration logic, semaphores, and INT/BUSY flags - designed for interprocessor communication and real-time shared-memory systems requiring deterministic access control and low-latency handshaking. It operates at 5 V ±10%, delivers 25 ns access time, supports automatic power-down per port, and is packaged in a Pb-free 84-pin PLCC.

For engineers reviewing the CY7C024-25AXCT datasheet, CY7C024-25AXCT pinout, CY7C024-25AXCT application, or CY7C024-25AXCT equivalent, key selection criteria include dual-port contention resolution timing (tPS = 15 ns), semaphore latch behavior, M/S-configurable master/slave expansion, and separate upper/lower byte enables for 16-bit data bus control.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with dedicated address, data, and control lines per port (A0L–A11L / A0R–A11R, I/O0L–I/O15L / I/O0R–I/O15R), enabling concurrent read/write operations to any memory location. Arbitration logic resolves port conflicts via BUSY assertion with tBLA = 10 ns and tBLC = 12 ns timing windows.

Semaphore subsystem comprises eight independent latches accessible via SEM pin activation, where write-to-semaphore requires tSOP = 15 ns deassertion before read, and semaphore ownership transfer is atomic and side-exclusive - only the port reading '0' may modify that latch until released by writing '1'.

Key Specifications

Pinout & Package

Package: 84-pin Pb-free PLCC (Plastic Leaded Chip Carrier), 29.31 mm × 29.31 mm body, 1.78 mm height, JEDEC MS-026AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L25PF and CY7C028-25AXC, CY7C024-25AXCT uniquely combines 5 V operation, on-chip semaphores, M/S expandability, and 84-pin PLCC compatibility - making it optimal for cost-sensitive, space-constrained, and legacy 5 V interprocessor designs where minimal external logic is required.

Availability

CY7C024-25AXCT is available at Aetrix Electronics and suitable for interprocessor communication hubs, dual-port video frame buffers, industrial PLC shared data pools, and communications protocol status buffers requiring stable component supply across extended product lifecycles.

Supply support for CY7C024-25AXCT 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 fabless semiconductor company specializing in memory, microcontrollers, and programmable solutions for industrial, automotive, and consumer applications.

CY7C024 belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency shared-memory architectures in multiprocessor and real-time embedded systems.

FAQ

What is the function of the M/S pin on CY7C024-25AXCT?

The M/S (Master/Slave) pin configures BUSY pin direction: HIGH sets BUSY as output (master mode), enabling connection to BUSY inputs of slave devices for 32-bit memory expansion; LOW sets BUSY as input (slave mode), allowing daisy-chained arbitration without external logic. This eliminates discrete gate requirements for wide-bus implementations.

How do the semaphore latches operate in CY7C024-25AXCT?

Eight semaphore latches are accessed by asserting SEM while holding CE HIGH; A0–A2 select latch address, and I/O0 carries token value (0 = acquired, 1 = free). Only the port reading '0' may write to that latch. Writing '1' releases the token, allowing immediate acquisition by the other port - enabling atomic, software-controlled resource locking.

Can CY7C024-25AXCT be used with 3.3 V logic interfaces?

No - CY7C024-25AXCT is specified for 5 V ±10% operation only (4.5 V to 5.5 V). Its input thresholds and output drive levels comply with TTL/5 V CMOS standards. Interfacing with 3.3 V systems requires level-shifting circuitry on all control, address, and data lines to avoid undefined states or excessive current leakage.

What happens during simultaneous access to the same memory location?

When both ports assert CE within 15 ns (tPS) and target the same address, on-chip arbitration asserts BUSY on the losing port within 10 ns (tBLA). The winning port proceeds with access; the losing port must wait until BUSY deasserts. If tPS is violated, access outcome is deterministic but not guaranteed - design must enforce tPS timing via synchronous clocking or delay matching.