Infineon Technologies CY7C131A-15JXI

Overview

CY7C131A-15JXI 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 PLCC package. It supports simultaneous reads of the same memory location and features BUSY arbitration and INT port-to-port interrupt flags. Used in multi-processor cache buffers and DSP shared-memory subsystems.

For engineers reviewing the CY7C131A-15JXI datasheet, CY7C131A-15JXI pinout, CY7C131A-15JXI application, or CY7C131A-15JXI equivalent, key selection criteria include dual-port arbitration timing (tBLA ≤15 ns), low-power standby modes (ISB1 ≤65 mA), open-drain BUSY output requiring external pull-up, and compatibility with CY7C141 for 16-bit expansion.

Technical Context

The CY7C131A-15JXI implements fully asynchronous dual-port operation with independent CE, R/W, and OE controls per port. Its arbitration logic resolves contention via open-drain BUSY outputs (left/right), while dedicated INT flags signal inter-port data placement at fixed addresses (3FFH/3FEH).

It supports automatic power-down per port via CE assertion and enables bus-width expansion using CY7C141 slave devices. The device uses 0.65 µm CMOS technology and operates across industrial temperature range (–40°C to +85°C) at 5 V ±10%.

Key Specifications

Pinout & Package

Package: 52-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026AC, body size 19.13 mm × 19.13 mm, lead pitch 0.65 mm, Pb-free compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C131-15JXI, the -15JXI variant adds hardware arbitration and interrupt support essential for autonomous dual-processor operation; versus IDT70V25L15PF, it retains 5 V compatibility but lacks JTAG and voltage flexibility-making it optimal for legacy industrial upgrades.

Availability

CY7C131A-15JXI is available at Aetrix Electronics and suitable for industrial PLCs, DSP-based motor drives, multi-core embedded controllers, and bit-slice computing systems requiring stable component supply across extended lifecycles.

Supply support for CY7C131A-15JXI 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 industrial, automotive, and communications markets.

The CY7C13x series targets deterministic shared-memory architectures in real-time embedded systems, emphasizing low-latency arbitration, robust ESD tolerance (>2001 V), and industrial temperature reliability.

FAQ

Is CY7C131A-15JXI pin-compatible with CY7C131-15JXI?

Yes-both use identical 52-pin PLCC packaging and share identical pin assignments for address, data, control, and power terminals. The only functional difference lies in internal logic: the 'A' version integrates arbitration and interrupt circuitry absent in the base '131' part, but this does not affect pin behavior or electrical interface.

What external components are required for BUSY and INT pins?

BUSYL, BUSYR, INTL, and INTR are open-drain outputs requiring external 4.7 kΩ pull-up resistors to VCC. No current-limiting resistors are needed; the internal driver sinks up to 16 mA (per datasheet Note 8), sufficient for standard TTL logic thresholds.

Can CY7C131A-15JXI operate with mixed 3.3 V and 5 V interfaces?

No-it is strictly a 5 V ±10% device. Input voltage thresholds (VIH = 2.2 V min, VIL = 0.8 V max) and output drive levels (VOH = 2.4 V min at –4 mA) are specified only for 5 V operation. Direct connection to 3.3 V logic risks undriven inputs or excessive current into 3.3 V outputs.

How does the automatic power-down feature function per port?

When CE is HIGH, the corresponding port enters low-power mode: outputs go high-impedance, internal array biasing shuts down, and ICC drops to ISB1 (65 mA max). Both ports can be independently powered down; leaving one CE LOW maintains full operation on that side while the other draws minimal standby current.