Infineon Technologies CY7C006A-15AXCT

Overview

CY7C006A-15AXCT from Cypress Semiconductor is a 16K × 8 true dual-port static RAM with independent left/right ports, 15 ns access time, 5 V supply, and on-chip arbitration logic for interprocessor communication in real-time embedded systems.

For engineers reviewing the CY7C006A-15AXCT datasheet, CY7C006A-15AXCT pinout, CY7C006A-15AXCT application, or CY7C006A-15AXCT equivalent, key selection considerations include simultaneous port access timing, BUSY/INT/SEM signal coordination, master/slave expandability, and PLCC-68 or TQFP-64 package compatibility with legacy board layouts.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, data, and control buses per port (A0L–A13L/I/O0L–I/O7L/CEL/OEL/R/WL/BUSYL/INTL/SEML and mirrored right-side signals), enabling deterministic read/write conflict resolution via hardware BUSY arbitration and software-managed semaphore latches.

It integrates eight dedicated semaphore registers accessible via SEM pin assertion, supports automatic power-down per port via CE, and allows 16-bit bus expansion using M/S pin configuration-where MASTER mode drives BUSY as output to coordinate with SLAVE devices without external logic.

Key Specifications

Pinout & Package

Available in 68-pin PLCC (JEDEC MS-026) and 64-pin TQFP (JEDEC MO-153) packages; both support through-hole and surface-mount assembly. Pin functions are electrically identical across packages, differing only in physical layout and thermal characteristics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L15PF and CY7C026V-15AC, CY7C006A-15AXCT offers direct PLCC-68/TQFP-64 footprint compatibility, native 5 V operation without level shifters, and integrated M/S expansion - making it optimal for legacy system upgrades and cost-sensitive dual-CPU interfaces.

Availability

CY7C006A-15AXCT is available at Aetrix Electronics and suitable for interprocessor communication, dual-CPU status buffering, and legacy system memory expansion requiring stable component supply and long-term obsolescence mitigation.

Supply support for CY7C006A-15AXCT 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) is a U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable logic solutions for industrial and embedded markets.

The CY7C006A belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency shared memory in real-time multi-processor systems - emphasizing hardware arbitration and inter-CPU signaling over density or speed scaling.

FAQ

What is the function of the M/S pin on CY7C006A-15AXCT?

The M/S (Master/Slave) pin configures the device's BUSY pin behavior: when HIGH, BUSY is an output used to drive slave devices in expanded-width memory configurations; when LOW, BUSY becomes an input to receive arbitration signals from a master. This eliminates external logic for 16-bit bus widening and ensures synchronized write sequencing across multiple devices.

How does the semaphore mechanism prevent resource conflicts between ports?

The CY7C006A-15AXCT provides eight dedicated hardware semaphore latches accessed via the SEML/SEMR pins and A0–A2. Writing '0' to a semaphore grants exclusive ownership; reading returns the current state. The latch is atomic - only the side that successfully writes first gains control, and the other port reads '1' until ownership is released, preventing race conditions in shared peripheral access.

Can CY7C006A-15AXCT operate with mixed voltage interfaces (e.g., 3.3 V controller + 5 V RAM)?

No - CY7C006A-15AXCT requires a nominal 5 V ±10% supply and TTL-level signaling (VIH = 2.2 V, VIL = 0.8 V). Direct connection to 3.3 V controllers violates input voltage limits and risks damage or metastability. Level-shifting circuitry (e.g., TXB0108 or discrete MOSFET translators) is mandatory for interoperability with 3.3 V logic domains.

What happens during simultaneous access to the same memory location by both ports?

When both ports assert CE within tPS (15 ns for -15 speed grade) and target the same address, on-chip arbitration asserts BUSYL/BUSYR within tBLA (10 ns) to block the losing port. The winning port completes its access; the losing port sees high-impedance data and must retry. No data corruption occurs, and the outcome is deterministic per access attempt.