Infineon Technologies CY7C144AV-25AC

Overview

CY7C144AV-25AC 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 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 signals in embedded control and video buffering systems.

For engineers reviewing the CY7C144AV-25AC datasheet, CY7C144AV-25AC pinout, CY7C144AV-25AC application, or CY7C144AV-25AC equivalent, key selection criteria include dual-port contention resolution timing (tPS = 10 ns), master/slave expandability for 16-bit bus width, semaphore latch behavior, and CMOS-level standby current (10 µA).

Technical Context

This device implements fully asynchronous dual-port SRAM operation with independent CE/OE/R/W control per port and hardware-based arbitration using BUSY flag assertion within 10 ns of address match (tPS). The internal semaphore block consists of eight dedicated latches accessible via SEM pin, with A0–A2 selecting latch index and I/O0 carrying write value.

Arbitration logic resolves port conflicts without external logic: when both ports assert CE and target identical addresses within tPS, one port gains immediate access while the other receives BUSY assertion (tBLA = 8 ns typical). The M/S pin configures BUSY as output (master) or input (slave), enabling daisy-chained expansion without discrete glue logic.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L25PF and IS61WV10248BLL-25MLI, the CY7C144AV-25AC delivers integrated hardware arbitration, mailbox interrupts, and semaphore latches - reducing BOM count by ≥3 discrete components and eliminating firmware synchronization overhead in multiprocessor designs.

Availability

CY7C144AV-25AC is available at Aetrix Electronics and suitable for industrial PLC communication buffers, dual-processor real-time control systems, and video frame buffer interfaces requiring stable component supply and long-term lifecycle support.

Supply support for CY7C144AV-25AC 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 acquired Cypress Semiconductor in 2020 and maintains full product continuity, documentation, and support for the former Cypress portfolio including dual-port SRAMs.

This device belongs to Infineon's legacy Cypress dual-port memory product line, designed specifically for deterministic interprocessor communication in real-time embedded systems with strict timing and resource-sharing requirements.

FAQ

What is the function of the M/S pin on CY7C144AV-25AC?

The M/S pin configures the device as master (M/S = HIGH) or slave (M/S = LOW). In master mode, BUSYL and BUSYR are outputs that signal arbitration outcomes to downstream slaves. In slave mode, those pins become inputs accepting BUSY signals from a master device, enabling seamless 16-bit or wider memory expansion without external logic.

How does the semaphore mechanism prevent race conditions between ports?

The eight dedicated semaphore latches operate independently of main memory. When one port writes '0' to a semaphore address (A0–A2), it gains exclusive ownership; the opposite port reads '1' until ownership is released. This atomic hardware lock prevents simultaneous access to shared peripherals like ADCs or UARTs without software polling or delay loops.

Can CY7C144AV-25AC operate reliably at 25 ns access time across its full temperature range?

Yes - the 25 ns maximum access time is specified over the industrial temperature range (–40 °C to +85 °C) and 3.3 V ± 0.3 V supply. Electrical characteristics tables in Rev. *J datasheet confirm tACE = 25 ns, tDOE = 25 ns, and tSD = 8 ns under worst-case voltage and temperature conditions.

Is there a pin-compatible upgrade path for CY7C144AV-25AC with lower power or higher density?

No direct pin-compatible upgrade exists in the Infineon portfolio. CY7C144AV-25AC remains the only 8 K × 8 dual-port SRAM in 64-pin TQFP with integrated semaphores and M/S logic. Higher-density alternatives like CY7C139AV (16 K × 8) require A13 pin usage and differ in address mapping, necessitating PCB and firmware changes.