Infineon Technologies CY7C144AV-25AXCT

Overview

CY7C144AV-25AXCT from Infineon Technologies (formerly Cypress) is an 8 K × 8 asynchronous dual-port static RAM with true dual-ported architecture, 25 ns access time, 3.3 V supply, and integrated on-chip arbitration logic. It enables simultaneous read/write access to the same memory location by independent left/right ports and supports interprocessor communication via INT/SEM/BUSY signaling in embedded control and video buffering applications.

For engineers reviewing the CY7C144AV-25AXCT datasheet, CY7C144AV-25AXCT pinout, CY7C144AV-25AXCT application, or CY7C144AV-25AXCT equivalent, key selection considerations include its 64-pin TQFP package, master/slave expandability for 16-bit bus width, semaphore-controlled resource sharing, and low 10 µA CMOS standby current.

Technical Context

The device implements fully asynchronous dual-port operation with independent CE/OE/R/W control per port and hardware-based arbitration using BUSY flag assertion within tBLA/tBLC timing windows. Contention resolution is deterministic when address match occurs within tPS (≤5 ns), ensuring predictable port priority without external logic.

It integrates eight dedicated semaphore latches accessible via SEM pin with A0–A2 addressing, supporting atomic resource locking across ports. Interrupts are generated via mailbox writes to addresses 1FFFH (right port) and 1FFE H (left port), with interrupt reset triggered only by owner-read - not by cross-port reads.

Key Specifications

Pinout & Package

Package: 64-pin thin quad flat pack (TQFP), 10 mm × 10 mm body, 0.5 mm pitch, RoHS-compliant Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L25PF and ISSI IS61LV25616AL, CY7C144AV-25AXCT uniquely delivers hardware-managed contention resolution, mailbox interrupts, and semaphore latches in a compact 64-pin 3.3 V package - essential for deterministic real-time interprocessor communication.

Availability

CY7C144AV-25AXCT is available at Aetrix Electronics and suitable for industrial PLC communication buffers, dual-port video frame buffers, and military avionics data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7C144AV-25AXCT 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and memory solutions for industrial, automotive, and IoT applications.

This device belongs to Infineon's legacy Cypress dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in safety-critical embedded systems where hardware arbitration and low-latency signaling are mandatory.

FAQ

What is the function of the M/S pin in CY7C144AV-25AXCT?

The M/S (Master/Slave) pin configures the device for word-width expansion: when HIGH, it operates as a master with BUSY pins as outputs; when LOW, as a slave with BUSY pins as inputs. This allows multiple devices to be cascaded into a 16-bit or wider memory system without external arbitration logic or discrete components - critical for scalable embedded multiprocessing architectures.

How does the semaphore mechanism prevent resource conflicts between ports?

The CY7C144AV-25AXCT provides eight dedicated hardware semaphore latches accessed via the SEM pin and A0–A2. Writing '0' to a semaphore grants exclusive ownership to that port; writing '1' releases it. The latch state appears inverted on the opposite port, enabling atomic lock acquisition and release without software race conditions - essential for coordinating shared peripherals like ADCs or DMA channels.

Can CY7C144AV-25AXCT retain data during power-down?

Yes - the device maintains full data retention in standby mode with ISB3 = 10 µA typical (both ports at CMOS levels). Power-down is triggered automatically when CE is deasserted, and data remains valid across the full operating temperature range (–55 °C to +125 °C) without external backup power or capacitors.

What timing parameter governs BUSY assertion during address contention?

BUSY is asserted tBLA (≤5 ns) after an address match between ports or tBLC (≤5 ns) after CE is taken LOW - whichever occurs first. This deterministic arbitration window ensures predictable port priority when both ports attempt simultaneous access to the same memory location, eliminating the need for retry loops or software arbitration.