Cypress Semiconductor Corp CY7C0241E-15AXC

Overview

CY7C0241E-15AXC from Cypress Semiconductor is a 4K × 18-bit true dual-port static RAM with independent left/right ports, 15 ns access time, on-chip semaphore logic, and BUSY/INT flags for interprocessor coordination-used in real-time video buffering and multiprocessor shared-memory systems.

For engineers reviewing the CY7C0241E-15AXC datasheet, CY7C0241E-15AXC pinout, CY7C0241E-15AXC application, or CY7C0241E-15AXC equivalent, key selection criteria include asynchronous dual-port arbitration timing, M/S-configurable master/slave expansion, 18-bit data width support, and Pb-free 100-pin TQFP packaging for high-density embedded designs.

Technical Context

This device implements fully asynchronous dual-port operation with separate CE/R/W/OE controls per port, enabling concurrent read/write access to any memory location. Its on-chip arbitration resolves contention via deterministic BUSY assertion (tBLA/tBLC) and supports software handshaking through eight dedicated semaphore latches accessed via SEM pin.

The interrupt mechanism uses upper two memory addresses (0xFFE/0xFFF) as mailboxes: write to opposite port's mailbox triggers INT flag; reading resets it. BUSY signal behavior changes with M/S pin state-output in master mode, input in slave mode-enabling seamless 36-bit expansion without external logic.

Key Specifications

Pinout & Package

Package: 100-pin thin quad flatpack (TQFP), Pb-free, 14 mm × 14 mm body, 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L15PF and IS61WV25616BLL-15TLI, CY7C0241E-15AXC delivers integrated arbitration, mailbox interrupts, and semaphores-reducing BOM count and firmware complexity in tightly coupled multiprocessor designs requiring deterministic shared-memory access.

Availability

CY7C0241E-15AXC is available at Aetrix Electronics and suitable for real-time video buffering, multiprocessor shared memory, and communications protocol stack buffering requiring stable component supply and long-term lifecycle support.

Supply support for CY7C0241E-15AXC 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-performance memory and programmable solutions for embedded systems, emphasizing reliability and integration.

CY7C0241E belongs to Cypress's dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems with strict timing and coherency requirements.

FAQ

What is the function of the M/S pin on CY7C0241E-15AXC?

The M/S pin configures the device as master (M/S = HIGH) or slave (M/S = LOW). In master mode, BUSY pins act as outputs signaling arbitration outcomes; in slave mode, they become inputs accepting BUSY from a master. This enables 36-bit memory expansion without external logic or discrete bus controllers.

How does semaphore operation work without conflicting with main memory access?

Semaphores reside in eight dedicated latches separate from the 4K × 18 memory array. Access requires asserting SEM (not CE), with A0–A2 selecting the latch. During SEM access, CE must remain HIGH, and only I/O0 is used for write data-ensuring no interference with normal memory reads/writes or data integrity.

Can both ports perform simultaneous reads to the same address?

Yes-true dual-port architecture allows concurrent reads to identical addresses without contention or BUSY assertion. Each port has independent sense amplifiers and output drivers, enabling coherent status mirroring and lockstep monitoring in safety-critical applications.

What happens if both ports attempt to write to the same location simultaneously?

On-chip arbitration asserts BUSY on the losing port after tBLA (address match) or tBLC (CE assertion). The winning port gains immediate access; the losing port must wait until BUSY deasserts before retrying. If tPS setup window is violated, arbitration outcome becomes unpredictable-designs must meet tPS timing to ensure determinism.