Infineon Technologies CY7C024-25JXCT

Overview

CY7C024-25JXCT from Cypress Semiconductor is a 4K × 16-bit true dual-port static RAM with independent left/right ports, on-chip arbitration logic, semaphore latches, and BUSY/INT flags - designed for interprocessor communication and real-time shared-memory systems requiring deterministic contention resolution. It operates at 25 ns access time, supports automatic power-down per port via CE, and is packaged in a 100-pin Pb-free TQFP.

For engineers reviewing the CY7C024-25JXCT datasheet, CY7C024-25JXCT pinout, CY7C024-25JXCT application, or CY7C024-25JXCT equivalent, key selection criteria include dual-port arbitration timing (tPS = 10 ns), semaphore latch behavior, M/S master/slave expandability, and separate upper/lower byte control for 16-bit data bus interfacing.

Technical Context

The CY7C024-25JXCT implements fully asynchronous dual-port architecture with dedicated address, data, and control lines per port (A0L–A11L / A0R–A11R, I/O0L–I/O15L / I/O0R–I/O15R). Arbitration resolves simultaneous access using BUSY assertion with tBLA = 8 ns and tBLC = 10 ns timing windows.

It integrates eight hardware semaphore latches accessible via SEM pin, where A0–A2 select latch index and I/O0 determines token state (0 = acquired). INT flag generation uses fixed mailbox addresses (FFEh/FFFh), and interrupt reset occurs only upon read of the owning port's mailbox - not by cross-port reads.

Key Specifications

Pinout & Package

Package: 100-pin Pb-free Thin Quad Plastic Flatpack (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 and CY7C028-25AC, the CY7C024-25JXCT uniquely combines 5 V compatibility, 100-pin TQFP packaging, and integrated M/S expandability - making it optimal for space-constrained, legacy-voltage industrial controllers needing scalable dual-port memory.

Availability

CY7C024-25JXCT is available at Aetrix Electronics and suitable for interprocessor communication links, dual-port video frame buffers, communications protocol stack buffers, and industrial PLC shared data exchange requiring stable component supply across extended production lifecycles.

Supply support for CY7C024-25JXCT 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 CY7C024 series targets deterministic real-time embedded systems requiring hardware-managed memory coherency between heterogeneous processors - emphasizing arbitration robustness, low-latency signaling, and long-term obsolescence mitigation.

FAQ

What is the function of the M/S pin in CY7C024-25JXCT?

The M/S pin configures the device as master (HIGH) or slave (LOW) to enable 32-bit memory expansion. In master mode, BUSY pins output arbitration status; in slave mode, they accept BUSY input from a master. This eliminates external glue logic when cascading multiple devices for wider data paths.

How do the semaphore latches operate without software race conditions?

Each of the eight semaphores is a dedicated hardware latch with atomic write-read behavior. Writing '0' to I/O0 acquires the token; writing '1' releases it. The latch output is registered, preventing corruption during cross-port access, and tSPS = 10 ns ensures deterministic ownership resolution even under worst-case timing skew.

Can INTL and INTR be used simultaneously for bidirectional messaging?

Yes - INTL asserts when the right port writes to address FFEh (left mailbox), and INTR asserts when the left port writes to FFFh (right mailbox). Each interrupt clears only upon local read of its respective mailbox, enabling full-duplex, non-blocking interprocessor signaling without shared-state dependencies.

What happens during simultaneous access to the same memory location?

On-address match within tPS = 10 ns, on-chip arbitration asserts BUSY on the losing port after tBLA = 8 ns. The winning port proceeds with access; the losing port's data bus goes high-Z and must retry. If tPS is violated, arbitration remains deterministic but timing margin is reduced - verified per JEDEC JESD79 compliance testing.