Infineon Technologies CY7C008V-25AXC

Overview

CY7C008V-25AXC from Cypress Semiconductor is a 3.3V, 64K × 8 true dual-port static RAM with simultaneous asynchronous access on independent left/right ports, 25 ns maximum access time, on-chip arbitration logic, and semaphore support - used in interprocessor communication buffers and video memory co-processing systems.

For engineers reviewing the CY7C008V-25AXC datasheet, CY7C008V-25AXC pinout, CY7C008V-25AXC application, or CY7C008V-25AXC equivalent, key selection criteria include dual-port arbitration timing (tBLA = 20 ns), CMOS-level standby current (ISB3 = 10 µA), M/S pin configurability for master/slave expansion, and 100-pin TQFP package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

This device implements fully asynchronous dual-port architecture with independent CE/R/W/OE controls per port, enabling concurrent read/write operations to shared memory locations without external arbitration logic. It integrates eight hardware semaphores and BUSY/INT flags to coordinate resource access between two processors or subsystems.

The CY7C008V-25AXC uses 0.35-µm CMOS process technology and supports automatic power-down per port via chip enable. Its address space spans A0L–A15L and A0R–A15R (16-bit addressing), with I/O0L–I/O7L and I/O0R–I/O7R data buses, and includes dedicated M/S pin for 16-bit-wide memory expansion using multiple devices.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Plastic Flatpack (TQFP), 0.5 mm pitch, body size 14 mm × 14 mm, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L25PF and IS61LV6416-25K, the CY7C008V-25AXC uniquely delivers integrated arbitration, semaphore, and M/S expansion in a single 3.3V 100-pin TQFP package - eliminating board-level complexity for true dual-processor memory sharing.

Availability

CY7C008V-25AXC is available at Aetrix Electronics and suitable for interprocessor communication buffers, video frame co-processing, and industrial PLC data exchange requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7C008V-25AXC 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 applications.

The CY7C008V series belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor memory sharing in real-time embedded systems.

FAQ

What is the function of the M/S pin on CY7C008V-25AXC?

The M/S (Master/Slave) pin configures the device for 16-bit memory expansion: when asserted high, it operates as a master; low, as a slave. This enables stacking two identical CY7C008V-25AXC units to form a 64K × 16 memory without external decoding or arbitration logic - directly supporting wider data bus architectures in multiprocessor systems.

How does the BUSY flag resolve memory contention between ports?

BUSY is asserted when both ports attempt to access the same memory address simultaneously. On the contending port, BUSY goes low (active) for tBLA = 20 ns, blocking further access until resolution. The arbitration logic grants priority based on timing - the earlier-valid address wins - and releases BUSY once the winning port completes its cycle, ensuring deterministic conflict resolution without software intervention.

Can CY7C008V-25AXC retain data during power loss?

Yes - in Data Retention Mode, holding CE ≥ VCC − 0.2 V (with VCC ≥ 2.0 V) limits current to ICCDR1 ≤ 50 µA, preserving stored data indefinitely. This mode requires no external battery; it leverages internal circuitry optimized for low-leakage operation at reduced voltage, validated down to –40°C and up to +85°C per datasheet specification.

What is the purpose of the semaphore latches?

The eight semaphore latches provide hardware-enforced mutual exclusion for shared resources. Each latch can be locked/unlocked via SEML/SEMR and INTL/INTR signals, allowing one port to claim exclusive access (e.g., to a UART register or DMA channel) while signaling the other port via interrupt. This eliminates race conditions and replaces polling-based software locks with atomic, low-latency hardware coordination.