Infineon Technologies CY7C025-25JXI

Overview

CY7C025-25JXI from Cypress Semiconductor is an 8K × 16-bit true dual-port static RAM with independent asynchronous ports, 25 ns access time, on-chip arbitration logic, and integrated semaphores for interprocessor resource sharing-used in real-time multiprocessor communication buffers and video frame memory subsystems.

For engineers reviewing the CY7C025-25JXI datasheet, CY7C025-25JXI pinout, CY7C025-25JXI application, or CY7C025-25JXI equivalent, key selection criteria include dual-port contention resolution timing (tPS = 10 ns), semaphore latch behavior, BUSY/INT flag interaction, and master/slave expansion capability in 100-pin TQFP packaging.

Technical Context

The CY7C025-25JXI implements fully asynchronous dual-port operation with separate CE/R/W/OE control per port, enabling concurrent read/write access to any memory location. Its on-chip arbitration resolves address-contention events within 10 ns (tPS), asserting BUSY to the losing port with tBLA = 8 ns latency.

It integrates eight dedicated semaphore latches accessible via SEM pin activation, supporting software-controlled resource locking across ports. The M/S pin configures the device as master (BUSY output) or slave (BUSY input), enabling 32-bit+ memory expansion without external logic.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Plastic Flatpack (TQFP), RoHS-compliant, body size 14 mm × 14 mm × 1.4 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L25PF and IS61LV51216AL-25K, the CY7C025-25JXI uniquely delivers 5 V-compatible dual-port operation with hardware semaphore arbitration and master/slave expansion-reducing BOM count and eliminating timing-critical external logic in real-time embedded systems.

Availability

CY7C025-25JXI is available at Aetrix Electronics and suitable for real-time multiprocessor communication, video frame buffering, industrial PLC data exchange, and avionics sensor hub interface requiring stable component supply across extended temperature ranges.

Supply support for CY7C025-25JXI 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.

The CY7C025 belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in hard real-time systems where hardware-enforced resource arbitration is mandatory.

FAQ

What is the function of the M/S pin on CY7C025-25JXI?

The M/S pin configures the device as master (HIGH) or slave (LOW) to enable 32-bit or wider memory expansion. In master mode, BUSY pins act as outputs to signal arbitration outcomes; in slave mode, they serve as inputs synchronized to the master's BUSY output-eliminating need for external arbitration logic in multi-chip configurations.

How do the semaphore latches operate in CY7C025-25JXI?

The eight semaphore latches are accessed by asserting SEM while holding CE HIGH. Writing '0' to a semaphore grants exclusive access to that resource; the opposing port reads '1' until ownership is released. Semaphore state is latched to prevent corruption during cross-port writes, with tSOP = 15 ns minimum setup before read verification.

Can CY7C025-25JXI operate reliably at –40°C to +85°C?

Yes-CY7C025-25JXI is rated for industrial temperature range (–40°C to +85°C) with VCC = 5.0 V ±10%. Electrical specifications including 25 ns access time, tPS = 10 ns arbitration window, and I_SB1 = 20 mA standby current are guaranteed across this full range per datasheet Rev. *D.

What happens when both ports attempt to write to the same address simultaneously?

On-chip arbitration asserts BUSY to the losing port within tBLA = 8 ns of address match. The winning port gains immediate access; the losing port must wait until BUSY deasserts before retrying. If tPS < 10 ns is violated, arbitration outcome becomes indeterminate-designs must enforce minimum address skew per timing diagram Figure 11.