Infineon Technologies CY7C025AV-20AXI

Overview

CY7C025AV-20AXI from Cypress Semiconductor is an 8K × 16-bit true dual-port static RAM with independent asynchronous access on left and right ports, 20 ns maximum access time, 3.3V operation, and integrated arbitration logic for interprocessor communication. It supports simultaneous read/write to the same memory location and is used in real-time embedded systems requiring deterministic port-to-port handshaking via BUSY, INT, and SEM signals.

For engineers reviewing the CY7C025AV-20AXI datasheet, CY7C025AV-20AXI pinout, CY7C025AV-20AXI application, or CY7C025AV-20AXI equivalent, key selection criteria include dual-port arbitration timing (tPS = 5 ns), semaphore latch count (8), byte-select granularity (UB/LB control), master/slave expandability, and industrial temperature range (–40°C to +85°C) compliance.

Technical Context

This device implements a fully asynchronous dual-port SRAM architecture with on-chip arbitration logic that resolves contention when both ports access the same address within 5 ns (tPS). Each port has dedicated CE, R/W, OE, BUSY, INT, and SEM control - enabling lock-free resource sharing without external logic.

The 8K × 16 organization uses A0–A12 addressing (13 address lines per port), with separate upper-byte (IO8–IO15) and lower-byte (IO0–IO7) control. The M/S pin configures the device as master (BUSY output) or slave (BUSY input), supporting 32-bit bus expansion using multiple devices without discrete glue logic.

Key Specifications

Pinout & Package

Package: 100-pin Pb-free Thin Quad Flat Pack (TQFP), 14 mm × 14 mm, 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25S-20PF and IS61WV51216BLL-20NLI, CY7C025AV-20AXI uniquely integrates arbitration, mailbox interrupts, and eight semaphores in a single 100-pin TQFP - eliminating external logic and reducing BOM count for tightly coupled dual-processor designs.

Availability

CY7C025AV-20AXI is available at Aetrix Electronics and suitable for industrial motion controllers, telecom line cards, medical imaging subsystems, and automotive ADAS preprocessing modules requiring stable component supply across extended product lifecycles.

Supply support for CY7C025AV-20AXI 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.

CY7C025AV-20AXI belongs to the CY7C02xAV dual-port SRAM family, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration and semaphore coherency are mandatory.

FAQ

What is the function of the M/S pin on CY7C025AV-20AXI?

The M/S (Master/Slave) pin configures the device for bus-width expansion: when HIGH, it operates as a master with BUSY pins driven as outputs; when LOW, it functions as a slave with BUSY pins accepting inputs from a master. This enables seamless 32-bit memory construction using two 16-bit devices without external logic, and is essential for synchronizing arbitration outcomes across stacked devices.

How do the semaphore latches operate in CY7C025AV-20AXI?

The device includes eight dedicated hardware semaphore latches accessed via SEML/SEMR and A0–A2. Writing '0' to a semaphore grants exclusive ownership to that port; writing '1' releases it. The latch state appears mirrored on the opposite port's data bus, enabling atomic resource reservation. Semaphore access requires SEM assertion while CE remains HIGH, and all 16 data lines reflect the latch value during reads.

Can CY7C025AV-20AXI be used in a single-ported configuration?

Yes - either port can be disabled by holding its CE pin HIGH, allowing the device to function as a standard 8K × 16 SRAM with full 20 ns access on the active port. The inactive port enters ultra-low-power standby (ISB3 = 10 μA), and all its control signals (R/W, OE, BUSY, INT) become inactive. This mode simplifies migration from legacy single-port designs.

What is the timing relationship between BUSY assertion and address matching?

BUSY is asserted tBLA = 5 ns after address match detection or tBLC = 5 ns after CE goes LOW - whichever occurs later. This 5 ns window (tPS) defines the arbitration resolution boundary: if both ports assert CE and present matching addresses within 5 ns, the internal logic deterministically assigns priority. Violating tPS risks indeterminate BUSY behavior and must be avoided in PCB layout and clock domain crossing design.