Infineon Technologies CY7C131-25JXCT

Overview

CY7C131-25JXCT from Cypress Semiconductor is a 1 K × 8 true dual-port static RAM with independent left/right ports, 25 ns maximum access time, 5 V ±10% supply, and automatic per-port power-down. It supports simultaneous reads of the same memory location and enables port-to-port communication via BUSY and INT flags-used in multi-processor cache buffers and DSP shared-memory subsystems.

For engineers reviewing the CY7C131-25JXCT datasheet, CY7C131-25JXCT pinout, CY7C131-25JXCT application, or CY7C131-25JXCT equivalent, key selection criteria include dual-port arbitration timing (tBLA ≤20 ns), open-drain BUSY output requiring external pull-up, CMOS-compatible I/O levels, and PLCC-52 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, data, and control buses for left (L) and right (R) ports. Each port features independent CE, R/W, and OE pins, plus dedicated BUSY (open-drain output) and INT (bidirectional interrupt) signals tied to arbitration logic that detects address contention and triggers priority-based flag assertion at fixed locations (3FFH/3FEH).

It uses 0.65 µm CMOS process for optimized speed-power trade-off, supports master-only operation (no slave BUSY input), and includes three standby current modes (ISB1–ISB4) dependent on TTL/CMOS input thresholds and active port count-enabling fine-grained power management in real-time embedded systems.

Key Specifications

Pinout & Package

Package: 52-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026AC compliant, lead-free (Pb-free) variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-10TLI and CY7C135-25JXC, CY7C131-25JXCT offers native 5 V compatibility and minimal BUSY latency (tBLA ≤20 ns), making it optimal for legacy industrial controllers where voltage alignment and deterministic arbitration timing are critical.

Availability

CY7C131-25JXCT is available at Aetrix Electronics and suitable for DSP shared-memory buffers, multi-processor cache coherence modules, and bit-slice processor interconnects requiring stable component supply across extended product lifecycles.

Supply support for CY7C131-25JXCT 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.

This device belongs to the CY7C13x dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems requiring hardware-managed memory arbitration.

FAQ

What is the function of the BUSY pin on CY7C131-25JXCT?

BUSYL and BUSYR are open-drain outputs that go low when their respective port attempts to access a memory location currently being accessed by the opposite port. They require external 4.7 kΩ pull-up resistors to VCC and provide hardware-level collision detection without software intervention, enabling immediate retry or priority escalation in real-time systems.

Can CY7C131-25JXCT operate at 3.3 V?

No. The device is specified only for 5 V ±10% operation (4.5–5.5 V). Attempting 3.3 V supply will result in undefined behavior, failure to meet timing specifications (e.g., tRC >25 ns), and potential data corruption due to insufficient noise margin on VIH/VIL thresholds. A level-shifting interface is mandatory for integration with 3.3 V controllers.

How does the INT flag work in port-to-port communication?

INTL asserts when data is written to address 3FFH by the right port; INTR asserts when data is written to 3FEH by the left port. These fixed addresses serve as hardware-triggered mailboxes-allowing one processor to signal event completion to the other without polling. The flag remains asserted until the receiving port performs a read from its corresponding address.

Is CY7C131-25JXCT pin-compatible with CY7C130-25JXCT?

No. CY7C131-25JXCT uses a 52-pin PLCC package, while CY7C130-25JXCT is offered only in 48-pin DIP. Although functional behavior is identical, the pin counts, layouts, and mechanical footprints differ entirely-requiring separate PCB designs and assembly tooling for each variant.