Infineon Technologies CY7C131-55JXCT

Overview

CY7C131-55JXCT from Cypress Semiconductor is a 1 K × 8 true dual-port static RAM with independent left/right ports, 55 ns maximum access time, 5 V ±10% supply, and 52-pin PQFP package. It enables simultaneous read access to the same memory location and supports port-to-port communication via BUSY and INT flags in DSP cache, bit-slice, and multi-processor shared-memory systems.

For engineers reviewing the CY7C131-55JXCT datasheet, CY7C131-55JXCT pinout, CY7C131-55JXCT application, or CY7C131-55JXCT equivalent, key selection criteria include asynchronous dual-port timing, 110 mA max operating current, automatic per-port power-down control, and compatibility with CY7C141 for 16-bit bus expansion.

Technical Context

The device implements fully asynchronous dual-port architecture with independent CE, R/W, and OE controls per port. Each port features open-drain BUSY (with external pull-up) and edge-triggered INT flags tied to fixed addresses (3FF_L, 3FE_R) for inter-port signaling.

Arbitration logic resolves contention when both ports access the same address, asserting BUSY on the contending port. Power management operates independently per port via CE-driven automatic power-down, achieving 35 mA standby current with CMOS inputs.

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 CY7C131-55JC and IS61LV25616AL-10TLI, the CY7C131-55JXCT uniquely delivers 52-pin Pb-free PQFP packaging with integrated BUSY/INT arbitration-enabling drop-in replacement in automated SMT lines while preserving hardware-coordinated multi-processor timing.

Availability

CY7C131-55JXCT is available at Aetrix Electronics and suitable for industrial PLC controllers, DSP-based motor drives, bit-slice computing modules, and real-time protocol bridges requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for CY7C131-55JXCT 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 with focus on reliability and integration.

The CY7C131 series belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency shared-memory architectures in multi-processor and digital signal processing systems.

FAQ

What is the function of the BUSY pin in CY7C131-55JXCT?

BUSYL and BUSYR are open-drain outputs that assert low when their respective port attempts to access an address currently being accessed by the opposite port. This signal must be pulled up externally (typically 4.7 kΩ to VCC) and provides hardware-level arbitration feedback within 20 ns, enabling immediate retry or priority resolution in real-time systems.

Can CY7C131-55JXCT operate with mixed voltage interfaces?

No. The device requires a single 5 V ±10% supply and uses TTL-compatible input thresholds (VIH = 2.2 V min, VIL = 0.8 V max). It does not support 3.3 V or 2.5 V I/O interfaces without level-shifting circuitry, as its internal logic and output drive strength are optimized for 5 V operation.

How does the INT flag mechanism work between ports?

Writing data to address 3FF_H on the left port or 3FE_H on the right port automatically asserts the corresponding INTL or INTR output. This edge-triggered signal remains active until cleared by reading from that same address, enabling hardware-synchronized inter-processor interrupts without polling overhead.

Is CY7C131-55JXCT pin-compatible with CY7C130-55JXCT?

No. CY7C131-55JXCT uses a 52-pin PQFP package with dedicated NC pins and relocated I/O assignments, while CY7C130-55JXCT uses a 48-pin DIP. Although functionally identical, the physical pinouts differ entirely-requiring PCB redesign for substitution.