Infineon Technologies CY7C025-25JXCT

Overview

CY7C025-25JXCT 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, supports master/slave expansion to 32-bit bus width, and operates at 25 ns access time with 5 V ±10% supply. Used in interprocessor communication buffers and dual-port video frame stores.

For engineers reviewing the CY7C025-25JXCT datasheet, CY7C025-25JXCT pinout, CY7C025-25JXCT application, or CY7C025-25JXCT equivalent, key selection criteria include dual-port arbitration timing (tPS = 10 ns), semaphore latch count (8), BUSY assertion delay (tBLA = 12 ns), and M/S pin-configurable master/slave operation for scalable memory interfacing.

Technical Context

The CY7C025-25JXCT implements fully asynchronous dual-port architecture with independent CE/R/W/OE controls per port, enabling concurrent access without external synchronization. Its on-chip arbitration logic resolves address-contention events within tPS = 10 ns, and BUSY signals assert deterministically after tBLA = 12 ns (address match) or tBLC = 15 ns (CE low).

Semaphore operation uses eight dedicated latches accessed via SEM pin with A0–A2 addressing; write-to-semaphore requires tSOP = 10 ns OE/SEM deassertion before read, and semaphore value appears at outputs after tSWRD + tDOE = 25 ns. INT flags use upper two memory locations (1FFFH/1FFE H) as mailboxes with automatic reset-on-read behavior.

Key Specifications

Pinout & Package

CY7C025-25JXCT is packaged in a 100-pin Pb-free Thin Quad Plastic Flatpack (TQFP) with 0.5 mm pitch, thermally enhanced for industrial temperature operation (–40°C to +85°C). Pin layout supports symmetric left/right port signal routing and M/S configuration for master/slave stacking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25S25PF and IS61LV51216-25TQLI, CY7C025-25JXCT uniquely integrates M/S-configurable arbitration, 8 semaphores, and mailbox interrupts in a 5 V-compatible 100-pin TQFP - reducing system-level complexity and eliminating glue logic for real-time interprocessor coordination.

Availability

CY7C025-25JXCT is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame stores, and industrial PLC data exchange modules requiring stable component supply across extended temperature ranges.

Supply support for CY7C025-25JXCT 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 mixed-signal ICs for industrial, automotive, and communications infrastructure applications.

CY7C025 belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor memory sharing in real-time embedded systems.

FAQ

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

The M/S pin configures the device as master (HIGH) or slave (LOW). In master mode, BUSY pins drive outputs to signal arbitration results; in slave mode, BUSY pins accept inputs from a master device. This enables seamless 32-bit bus expansion using identical CY7C025-25JXCT units without external logic.

How do the semaphore latches operate, and what address range do they use?

Semaphores are eight dedicated latches accessed via SEM pin assertion with A0–A2 selecting the latch (0–7). CE must remain HIGH during SEM activation. Only I/O0 carries the write value; reading returns the latch state on all 16 data lines. No main memory address decoding is involved - semaphores reside outside the 8K × 16 memory map.

Can CY7C025-25JXCT operate reliably at 85°C ambient temperature?

Yes. CY7C025-25JXCT is rated for industrial temperature range (–40°C to +85°C) with 5 V ±10% supply. Electrical characteristics including 25 ns access time, 20 mA standby current, and tPS = 10 ns arbitration timing are guaranteed across this full range per datasheet Rev. *D.

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

On-chip arbitration grants access to one port based on tPS timing window (≤10 ns). The losing port asserts its BUSY flag within tBLA = 12 ns (after address match) or tBLC = 15 ns (after CE low). That port's write is blocked until BUSY deasserts - preventing data corruption without external intervention.