Infineon Technologies CY7C131-15JXC

Overview

CY7C131-15JXC from Cypress Semiconductor is a 1K × 8 true dual-port static RAM with independent left/right ports, 15 ns maximum access time, 5 V supply, and 52-pin PLCC package. It supports simultaneous reads of the same memory location, features BUSY arbitration and INT port-to-port communication flags, and operates in commercial temperature range (0°C to +70°C). Used in DSP cache, bit-slice processors, and multi-processor shared-memory systems.

For engineers reviewing the CY7C131-15JXC datasheet, CY7C131-15JXC pinout, CY7C131-15JXC application, or CY7C131-15JXC equivalent, key selection criteria include dual-port arbitration timing (tBLA = 15 ns), low-power standby modes (ISB1 = 75 mA), open-drain BUSY output requiring pull-up, and compatibility with CY7C141 for 16-bit bus expansion.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, data, and control lines per port (A0L–A9L/I/O0L–I/O7L/CEL/R/WL/OEL on left; A0R–A9R/I/O0R–I/O7R/CER/R/WR/OER on right). Arbitration logic resolves contention via open-drain BUSYL/BUSYR outputs and priority-based access resolution.

It integrates automatic power-down controlled independently per port via CE pins, supports TTL/CMOS-compatible inputs, and provides interrupt signaling using dedicated INTL/INTR flags tied to fixed addresses (3FFH left, 3FEH right) - enabling inter-processor messaging without software polling.

Key Specifications

Pinout & Package

Package: 52-pin Plastic Leaded Chip Carrier (PLCC), lead-free compliant, body size 19.1 mm × 19.1 mm, JEDEC MO-047AC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C131A-15JXC, the CY7C131-15JXC trades 20 mA higher ICC and 10 mA higher ISB1 for broader legacy qualification; versus CY7C141-15JXC, it provides full master functionality including arbitration and interrupt generation - making it self-contained for 8-bit dual-port use cases.

Availability

CY7C131-15JXC is available at Aetrix Electronics and suitable for DSP cache memory, bit-slice processor interfacing, and multi-processor shared-memory systems requiring stable component supply, long-term lifecycle support, and verified PLCC packaging.

Supply support for CY7C131-15JXC 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, with focus on reliability, speed, and integration.

The CY7C131 series belongs to Cypress' dual-port SRAM product line, engineered specifically for deterministic, contention-free memory sharing in real-time multi-processor and signal-processing architectures.

FAQ

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

The BUSYL and BUSYR pins are open-drain outputs that assert LOW when their respective port attempts to access a memory location currently being accessed by the opposite port. This hardware arbitration signal requires an external pull-up resistor to VCC and enables deterministic resolution of simultaneous access conflicts without software intervention.

Can CY7C131-15JXC operate with mixed voltage interfaces?

No - CY7C131-15JXC is strictly a 5 V ±10% device with TTL-compatible input thresholds (VIH = 2.2 V, VIL = 0.8 V) and CMOS-level outputs. It does not support 3.3 V or mixed-voltage I/O; level-shifting circuitry is required for interfacing with lower-voltage logic families.

How does the INT flag mechanism work in practice?

Writing data to address 3FFH (left port) or 3FEH (right port) automatically asserts the corresponding INTL or INTR pin LOW. This open-drain interrupt signal remains active until cleared by reading from that same address, enabling hardware-triggered inter-processor communication without polling or shared registers.

Is CY7C131-15JXC pin-compatible with CY7C130-15JXC?

No - CY7C131-15JXC uses a 52-pin PLCC package while CY7C130-15JXC is in a 48-pin DIP package. Though functionally identical, their physical footprints, pin counts, and pin assignments differ significantly; direct PCB substitution is not possible without redesign.