Infineon Technologies CY7C025-15AXCT

Overview

CY7C025-15AXCT from Cypress Semiconductor is an 8K × 16-bit true dual-port static RAM with on-chip arbitration, semaphores, and INT/BUSY flags. It enables simultaneous asynchronous read/write access to shared memory by two independent processors or data paths, features 15 ns access time, 5 V supply, and operates across commercial temperature range (0°C to +70°C). It is used in interprocessor communication buffers and video/graphics subsystems requiring deterministic port-to-port handshaking.

For engineers reviewing the CY7C025-15AXCT datasheet, CY7C025-15AXCT pinout, CY7C025-15AXCT application, or CY7C025-15AXCT equivalent, key selection criteria include dual-port arbitration timing (tPS = 10 ns), semaphore latch behavior, M/S-configurable master/slave expansion, and TQFP-100 vs PLCC-84 package compatibility for board layout and thermal management.

Technical Context

The CY7C025-15AXCT implements fully asynchronous dual-port architecture with independent CE/R/W/OE control per port, enabling concurrent reads/writes without external synchronization. Its on-chip arbitration logic resolves address-contention events within 10 ns (tPS), asserting BUSY to the losing port and guaranteeing deterministic access priority.

It integrates eight dedicated semaphore latches accessible via SEM pin, supporting software-controlled resource locking between ports; each semaphore is write-protected-only the side that successfully writes '0' may modify it until released. The INT flag supports mailbox-based inter-port messaging using upper memory addresses (1FFFH/1FFE H), with interrupt auto-clear on mailbox read.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), Pb-free, body size 14 mm × 14 mm, 0.5 mm pitch. Pin-compatible with CY7C025-15AXC (non-Pb-free TQFP) and CY7C025-15AC (PLCC-84).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25S15YG and CY7C025-15AC, the CY7C025-15AXCT uniquely combines Pb-free TQFP packaging, 5 V compatibility, and guaranteed 15 ns timing under commercial temperature-making it optimal for cost-sensitive, RoHS-compliant embedded systems requiring drop-in dual-port memory without voltage translation.

Availability

CY7C025-15AXCT is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame buffers, and industrial PLC memory coherency modules requiring stable component supply and long-term lifecycle support.

Supply support for CY7C025-15AXCT 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 system-on-chip solutions for embedded and industrial applications.

The CY7C02x series was designed specifically for deterministic, low-latency inter-processor memory sharing-targeting communications infrastructure, real-time control, and graphics subsystems where software-managed memory coherency is insufficient.

FAQ

What is the function of the M/S pin on CY7C025-15AXCT?

The M/S pin configures the device as master (HIGH) or slave (LOW) for word-width expansion. In master mode, BUSY pins act as outputs to signal arbitration results to slave devices; in slave mode, BUSY pins become inputs to receive those signals. This eliminates external logic when building 32-bit dual-port memory systems using multiple CY7C025 devices.

How do the semaphore latches operate, and what addresses access them?

Semaphore latches are accessed by asserting SEM low while holding CE high; A0–A2 select among the eight latches (0–7). Writing '0' to a latch grants exclusive ownership to that port; writing '1' releases it. Only the owning port can modify its semaphore, and reads return the current latch state-enabling robust software-controlled resource locking without memory-mapped overhead.

Can CY7C025-15AXCT be used in a 3.3 V system?

No. The CY7C025-15AXCT is specified for 5 V ± 10% operation (4.5–5.5 V) and is not 3.3 V tolerant. Applying 3.3 V to VCC will result in undefined operation and failure to meet 15 ns access timing. For 3.3 V dual-port SRAM, consider IDT70V25S15YG or similar 3.3 V-native parts-not drop-in replacements.

What happens during simultaneous access to the same memory location by both ports?

When both ports assert CE and present matching addresses within t_PS (10 ns), on-chip arbitration grants access to one port and asserts BUSY to the other. The winning port completes the access; the losing port's BUSY remains asserted until the winning port releases the address. No data corruption occurs, and the losing port may retry after BUSY deasserts-ensuring deterministic, hardware-governed conflict resolution.