Infineon Technologies CY7C024-15JXCT

Overview

CY7C024-15JXCT from Cypress Semiconductor is a 4K × 16-bit true dual-port static RAM with independent left/right ports, 15 ns access time, on-chip semaphore logic, and BUSY/INT flags for interprocessor communication-used in real-time embedded multiprocessor systems requiring deterministic arbitration and mailbox-style messaging.

For engineers reviewing the CY7C024-15JXCT datasheet, CY7C024-15JXCT pinout, CY7C024-15JXCT application, or CY7C024-15JXCT equivalent, key selection criteria include simultaneous asynchronous port access, master/slave expandability to 32-bit bus width, integrated semaphores for resource locking, and PLCC-84 packaging compatibility with legacy industrial control backplanes.

Technical Context

The device implements fully asynchronous dual-port architecture with separate CE/R/W/OE controls per port, enabling concurrent read/write operations-even to the same memory location-resolved via hardware arbitration that asserts BUSY within 12 ns of address match. It supports both master (BUSY output) and slave (BUSY input) modes via M/S pin for seamless 32-bit data bus expansion without external logic.

Semaphore operation uses eight dedicated latches accessed via SEM pin with A0–A2 addressing; each latch is write-locked to one port upon successful zero-write, ensuring exclusive shared-resource ownership. Interrupts are generated by writes to upper memory mailboxes (address FFE/FFF), with INT flag reset only upon owner-read-enabling reliable inter-port signaling even under contention.

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLCC), lead-free, surface-mount compatible with IPC-7351B footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L15PF and CY7C028-15AC, CY7C024-15JXCT delivers optimal balance of deterministic arbitration, integrated semaphores, and minimal footprint-making it preferred for cost-sensitive, safety-critical, or space-constrained dual-processor systems where hardware-enforced coherency is mandatory.

Availability

CY7C024-15JXCT is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics flight control units, medical imaging frame buffers, and telecom line card status managers requiring stable component supply across extended product lifecycles.

Supply support for CY7C024-15JXCT 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) is a U.S.-based semiconductor company specializing in high-reliability memory, PSoC, and USB solutions for industrial, automotive, and aerospace markets.

CY7C024 belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in safety-critical embedded systems where software-managed memory coherency is insufficient.

FAQ

What is the function of the M/S pin on CY7C024-15JXCT?

The M/S (Master/Slave) pin configures the device's BUSY pin behavior: when HIGH, BUSY signals are outputs used to drive arbitration outcomes to downstream slave devices; when LOW, BUSY signals become inputs accepting arbitration results from a master. This enables direct daisy-chaining of multiple CY7C024-15JXCT devices for 32-bit or wider memory expansion without external logic.

How do the semaphore latches prevent resource conflicts between ports?

Each of the eight semaphores operates as a hardware-enforced binary token: writing '0' to a semaphore address locks it to the writing port, causing subsequent reads from the other port to return '1' until the owner writes '1' to release it. This atomic acquire/release mechanism ensures exclusive access to shared peripherals like ADCs or UARTs without software intervention or race conditions.

Can CY7C024-15JXCT operate with mixed voltage interfaces?

No-CY7C024-15JXCT requires a single 5.0 V ±10% supply (VCC) and is not voltage-tolerant. All I/O pins are TTL-compatible at 5 V, and interfacing with 3.3 V or 1.8 V logic requires level-shifting circuitry. The device does not support multi-voltage I/O banks or internal voltage translation.

What happens during simultaneous access to the same memory location by both ports?

Hardware arbitration resolves contention within 12 ns (tBLA): the winning port gains immediate access while the losing port asserts its BUSY flag. If the losing port attempts to read the contested location, it receives indeterminate data until tDDD (data flow-through delay) elapses-after which valid data appears. This ensures deterministic timing without bus lockup or system reset.