Infineon Technologies CY7C025-15AC

Overview

CY7C025-15AC from Cypress Semiconductor is an 8K × 16-bit true dual-port static RAM with on-chip arbitration, semaphores, and INT/BUSY flags for interprocessor communication. It operates at 5 V ±10%, delivers 15 ns access time, supports independent asynchronous read/write on left/right ports, and is used in multiprocessor status buffering and video memory subsystems.

For engineers reviewing the CY7C025-15AC datasheet, CY7C025-15AC pinout, CY7C025-15AC application, or CY7C025-15AC equivalent, key selection criteria include dual-port contention resolution timing (tPS = 10 ns), semaphore latch count (8), master/slave expandability via M/S pin, and 84-pin PLCC package compatibility with legacy board layouts.

Technical Context

The CY7C025-15AC implements fully asynchronous dual-port architecture with separate CE/R/W/OE control per port, enabling concurrent access to any memory location. Its on-chip arbitration logic resolves address-contention events within 10 ns (tPS), while BUSY outputs signal port-level access conflicts.

Semaphore operation uses eight dedicated latches accessed via SEM pin assertion and A0–A2 addressing; each latch enforces mutual exclusion by allowing write access only to the side holding the '0' token. INT flags support mailbox-based interport messaging using upper two memory locations (1FFE/1FFF).

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLCC), Pb-free compliant, body size 29.31 mm × 29.31 mm, 1.78 mm height, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25S15PF and CY7C025-15JC, the CY7C025-15AC offers Pb-free 84-pin PLCC compatibility with built-in M/S expandability-making it optimal for cost-sensitive commercial designs needing drop-in replacement capability and legacy footprint support.

Availability

CY7C025-15AC is available at Aetrix Electronics and suitable for interprocessor communication hubs, dual-port video frame buffers, and communications protocol stack buffers requiring stable component supply across multi-year production cycles.

Supply support for CY7C025-15AC 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, PSoC, and interface solutions for embedded systems.

The CY7C025 belongs to Cypress's dual-port SRAM product line, designed specifically for deterministic interprocessor communication and real-time shared-memory architectures in industrial control and communications equipment.

FAQ

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

The M/S pin configures the device as either a master (M/S = HIGH) or slave (M/S = LOW). In master mode, BUSY pins act as outputs to signal arbitration results; in slave mode, they become inputs to receive BUSY from a master device. This enables seamless 32-bit+ memory width expansion without external logic.

How do the semaphore latches operate in CY7C025-15AC?

The eight semaphore latches are accessed via SEM pin assertion and A0–A2 addressing. Writing '0' to a semaphore grants exclusive access to that resource; the opposing port reads '1' until ownership is released. Semaphores are independent of main memory and enforce atomic resource locking without software intervention.

Can CY7C025-15AC support simultaneous read and write to the same memory location?

No - simultaneous access to the same address triggers on-chip arbitration. The winning port gains immediate access; the losing port asserts its BUSY flag. Data read during contention is indeterminate unless delayed by tDDD (flowthrough delay) after the winning port's write completes.

What is the role of the INTL and INTR pins?

INTL and INTR are open-drain interrupt flags. When one port writes to the other's mailbox (1FFE for left, 1FFF for right), the corresponding INT pin asserts. The interrupt clears only when the owning port reads the mailbox - enabling reliable, edge-triggered interport signaling without polling.