Infineon Technologies CY7C027VN-15AXC

Overview

CY7C027VN-15AXC from Cypress Semiconductor is a 3.3V, 32K × 16-bit true dual-port static RAM with asynchronous operation, 15 ns access time, on-chip arbitration logic, and integrated semaphores for interprocessor communication. It supports simultaneous independent read/write access to the same memory location and is used in multiprocessor bus arbitration, video frame buffering, and real-time control systems.

For engineers reviewing the CY7C027VN-15AXC datasheet, CY7C027VN-15AXC pinout, CY7C027VN-15AXC application, or CY7C027VN-15AXC equivalent, key selection criteria include dual-port contention resolution timing (tPS), BUSY/INT/SEM signal behavior, master/slave expandability via M/S pin, and low ISB3 standby current (10 μA typical) for power-sensitive embedded designs.

Technical Context

This device implements fully asynchronous dual-port architecture with independent left/right address buses (A0L–A14L / A0R–A14R), separate R/W, CE, and OE controls per port, and hardware-based arbitration using BUSY flags asserted within tBLA (≤15 ns) after address match. The 32K × 16 organization maps to 15-bit addressing per port.

On-chip semaphore latches (8 total) operate independently of main memory, accessed via SEM pin with A0–A2 addressing, enabling deterministic resource locking between ports without software polling overhead. The M/S pin configures BUSY as output (master) or input (slave), supporting 32-bit data bus expansion without external logic.

Key Specifications

Pinout & Package

Package: 100-pin Pb-free TQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V27L15PF and IS61WV3216EBLL-15NLI, CY7C027VN-15AXC uniquely integrates arbitration, semaphores, and master/slave expansion in a single 100-pin package - reducing system-level component count and eliminating timing-critical external logic design.

Availability

CY7C027VN-15AXC is available at Aetrix Electronics and suitable for industrial PLC backplanes, dual-processor real-time control units, and video frame synchronization circuits requiring stable component supply across extended product lifecycles.

Supply support for CY7C027VN-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-reliability memory and programmable solutions for industrial, automotive, and communications infrastructure.

CY7C027VN-15AXC belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware-enforced arbitration is critical.

FAQ

What is the function of the M/S pin, and how does it affect BUSY pin behavior?

The M/S pin configures CY7C027VN-15AXC as master (M/S = HIGH) or slave (M/S = LOW). In master mode, BUSYL/BUSYR are outputs that signal arbitration results to downstream slaves; in slave mode, they become inputs accepting BUSY from a master. This enables seamless 32-bit data bus expansion without external logic or timing constraints beyond tBLC (≤15 ns).

How do the semaphore latches operate, and what is their address mapping?

The eight semaphore latches are accessed exclusively via the SEM pin (not CE), with A0–A2 selecting the latch (0–7). Writing a 0 to I/O0 sets the latch; reading returns the current state across all 16 I/O lines. Semaphores are independent of main memory - no address overlap - and provide atomic resource locking without software polling or race conditions.

Can CY7C027VN-15AXC be used in systems requiring both ports to operate at different voltage levels?

No. CY7C027VN-15AXC is a single-supply 3.3V device (VCC = 3.3V ± 300 mV). Both ports share the same VCC and GND rails, and all I/Os are referenced to this supply. Mixed-voltage operation (e.g., 3.3V left port / 1.8V right port) is not supported and would violate absolute maximum ratings.

What happens during simultaneous write attempts to the same memory location, and how is resolution timing guaranteed?

When both ports assert CE and present matching addresses within tPS (≤5 ns), on-chip arbitration asserts BUSY on the losing port within tBLA (≤15 ns). The winning port proceeds with the write; the losing port must wait until BUSY deasserts before retrying. This hard-timed resolution is guaranteed by silicon design - no firmware intervention required.