Infineon Technologies CY7C131-15NXI

Overview

CY7C131-15NXI from Cypress Semiconductor is a 1 K × 8 true dual-port static RAM with independent left/right ports, 15 ns access time, 5 V ±10% supply, and 52-pin PQFP package. It supports simultaneous reads of the same memory location and includes BUSY arbitration and INT port-to-port interrupt flags. Used in multi-processor cache buffers and DSP shared-memory subsystems.

For engineers reviewing the CY7C131-15NXI datasheet, CY7C131-15NXI pinout, CY7C131-15NXI application, or CY7C131-15NXI equivalent, key selection criteria include dual-port arbitration timing (tBLA ≤15 ns), low-power standby modes (ISB3 = 15 mA), open-drain BUSY output requiring pull-up, and compatibility with CY7C141 for 16-bit bus expansion.

Technical Context

The device implements fully asynchronous dual-port operation with independent CE, R/W, and OE controls per port. Arbitration logic resolves contention via open-drain BUSY outputs (requiring external pull-ups) and dedicated INT flags at fixed addresses (3FFH left, 3FEH right).

It supports automatic power-down per port via CE assertion and enables bus-width expansion using CY7C141 slave devices. The 0.65 µm CMOS process delivers 15 ns tAA and tACE while maintaining ICC ≤190 mA max under commercial conditions.

Key Specifications

Pinout & Package

Package: 52-pin Plastic Quad Flat Pack (PQFP), RoHS-compliant, body size 10 mm × 10 mm, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-10TLI and CY7C133-25AC, CY7C131-15NXI uniquely delivers 15 ns dual-port timing with integrated BUSY/INT arbitration in a compact 52-pin PQFP-enabling deterministic inter-processor communication without external logic.

Availability

CY7C131-15NXI is available at Aetrix Electronics and suitable for industrial motion controllers, multi-core DSP subsystems, bit-slice processor interconnects, and real-time PLC data exchange requiring stable component supply across extended temperature ranges.

Supply support for CY7C131-15NXI 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) is a fabless semiconductor company specializing in memory, microcontrollers, and programmable logic solutions for industrial and embedded markets.

CY7C131 belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time control and signal processing systems.

FAQ

What is the function of the BUSY pin on CY7C131-15NXI?

The BUSY pin is an open-drain output that goes LOW when its associated port attempts to access a memory location currently being accessed by the opposite port. It requires an external pull-up resistor to define the HIGH state. This signal enables hardware-level arbitration without software polling, with tBLA ≤15 ns latency from address match.

Can CY7C131-15NXI operate with mixed voltage interfaces?

No. CY7C131-15NXI is strictly a 5 V ±10% device with TTL-compatible input thresholds (VIH ≥2.2 V, VIL ≤0.8 V). It does not support 3.3 V or mixed-voltage I/O. Level-shifting circuitry is required for interfacing with 3.3 V processors or FPGAs.

How does the INT flag work in practice?

Writing any data to address 3FFH (left port) or 3FEH (right port) asserts the corresponding INTL or INTR output LOW. Reading from those addresses clears the flag. This provides hardware-triggered inter-port signaling-e.g., DSP-A writes to 3FFH to notify DSP-B that new data is ready in shared memory.

Is CY7C131-15NXI pin-compatible with CY7C131-15ZI?

Yes. CY7C131-15NXI (Pb-free PQFP) and CY7C131-15ZI (lead-based PQFP) share identical pinout, electrical characteristics, and timing. The suffix difference indicates RoHS compliance status only; no redesign or layout change is needed when migrating between them.