Infineon Technologies CY7C057V-15BBC

Overview

CY7C057V-15BBC from Cypress Semiconductor is a 32K × 36-bit asynchronous dual-port static RAM with true dual-ported memory cells, 15 ns access time, 3.3 V supply, and integrated on-chip arbitration logic. It enables simultaneous independent read/write access to the same memory location across left and right ports, supporting interprocessor communication in real-time embedded systems requiring deterministic latency and low-power operation.

For engineers reviewing the CY7C057V-15BBC datasheet, CY7C057V-15BBC pinout, CY7C057V-15BBC application, or CY7C057V-15BBC equivalent, this device is selected for high-reliability dual-access buffering where port-to-port handshaking (via BUSY/INT/semaphores), bus matching, and master/slave depth expansion are required - not for single-port or serial interface use cases.

Technical Context

The CY7C057V-15BBC implements fully asynchronous dual-port SRAM architecture with independent control logic per port (CE0/CE1, R/W, OE, address, I/O), enabling concurrent access without clock synchronization. Its 32K × 36 organization uses A0–A14 addressing on both ports, with dedicated semaphore latches (8 shared) and interrupt flags (INTL/INTR) for software-coordinated resource sharing.

Arbitration is handled internally via BUSYL/BUSYR signaling and M/S pin configuration for master/slave cascading up to 72-bit data width. Power management includes automatic port-level power-down (ISB3 = 10 µA typical) triggered by CE0/CE1 logic states, and CMOS/TTL-compatible I/O levels with defined VIH/VIL thresholds (2.0 V / 0.8 V).

Key Specifications

Pinout & Package

Package: 144-pin TQFP (20 × 20 × 1.4 mm), RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L15PF and IS61WV102432BLL-15BLI, the CY7C057V-15BBC delivers integrated arbitration, true 36-bit width, and deterministic port-to-port signaling - reducing PCB complexity, firmware overhead, and timing uncertainty in tightly coupled multiprocessor systems.

Availability

CY7C057V-15BBC is available at Aetrix Electronics and suitable for interprocessor communication buffers, video frame buffers, communications protocol stack buffers, and industrial PLC I/O mapping memory requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7C057V-15BBC 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 high-performance memory, microcontrollers, and programmable solutions for industrial, automotive, and communications markets.

The CY7C057V belongs to Cypress's FLEx36™ family of asynchronous dual-port SRAMs, designed specifically for deterministic, low-latency interprocessor and real-time video buffering applications where hardware-managed concurrency is critical.

FAQ

What is the function of the M/S pin on CY7C057V-15BBC?

The M/S (Master/Slave) pin configures the device for depth expansion in multi-chip memory systems. When asserted HIGH, it operates as a master; LOW, as a slave. This enables 72-bit or wider data buses without requiring separate master/slave part numbers or external logic, directly supporting cascaded CY7C057V configurations.

How does the BUSY flag operate during simultaneous port access?

BUSYL and BUSYR are active-HIGH open-drain outputs that assert when either port attempts to access a memory location currently being accessed by the other port. The signal remains asserted until the conflicting access completes, providing hardware-level collision detection without software polling or timer-based arbitration.

Can CY7C057V-15BBC operate with mixed voltage interfaces (e.g., 3.3 V core, 1.8 V I/O)?

No. The device is specified exclusively for 3.3 V ± 165 mV operation across all pins. I/O voltage levels (VIH = 2.0 V min, VIL = 0.8 V max) and internal logic are designed for 3.3 V CMOS/TTL compatibility. Interfacing to lower-voltage systems requires level-shifting circuitry on all address, control, and data lines.

What is the purpose of the B0–B3 byte select inputs?

B0–B3 enable selective 9-bit write operations on the left port only, allowing partial-word updates without disturbing adjacent bytes. Each combination activates one of four 9-bit byte lanes (I/O0L–I/O8L, I/O9L–I/O17L, etc.), reducing bus contention and dynamic power consumption during narrow-width writes.