Infineon Technologies CY7C024-55JXCT

Overview

CY7C024-55JXCT from Cypress Semiconductor is a 4K × 16-bit true dual-port static RAM with independent left/right ports, on-chip arbitration logic, semaphores, and INT/BUSY flags - designed for interprocessor communication and real-time shared-memory systems requiring deterministic access control. It operates at 5 V ±10%, supports 55 ns maximum access time, delivers 150 mA typical operating current, and is packaged in an 84-pin PLCC.

For engineers reviewing the CY7C024-55JXCT datasheet, CY7C024-55JXCT pinout, CY7C024-55JXCT application, or CY7C024-55JXCT equivalent, key selection criteria include dual-port arbitration timing (tPS = 5 ns), semaphore latch behavior, master/slave expandability via M/S pin, and BUSY/INT flag interaction under contention - all critical for multiprocessor mailbox and resource-locking implementations.

Technical Context

The CY7C024-55JXCT implements fully asynchronous dual-port access with separate CE/R/W/OE controls per port, enabling concurrent reads from the same memory location without conflict. Its on-chip arbitration resolves address-contention events within 5 ns (tPS), asserting BUSY to delay the losing port while granting deterministic access to the winning port.

Semaphore logic comprises eight dedicated latches accessible via SEM pin activation, where write-to-zero grants exclusive token ownership and read-back confirms acquisition status. The INT flag supports mailbox-based inter-port messaging using the two highest memory addresses (FFEh/FFFh), with interrupt auto-clear on mailbox read.

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLCC), lead-free, surface-mountable with J-lead profile and 0.05-inch pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L15PF and CY7C028-55JC, the CY7C024-55JXCT uniquely integrates semaphores and M/S expandability in a 4K × 16 commercial-grade 5 V device - making it optimal for cost-sensitive, self-contained dual-processor systems where external logic minimization is prioritized over voltage scaling or memory expansion.

Availability

CY7C024-55JXCT is available at Aetrix Electronics and suitable for interprocessor communication, dual-port video buffering, communications protocol stacks, and industrial PLC data exchange requiring stable component supply across extended production lifecycles.

Supply support for CY7C024-55JXCT 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) is a U.S.-based semiconductor company specializing in programmable solutions, memory, and USB/USB-C controllers for embedded and industrial applications.

The CY7C024 series belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor memory sharing in real-time control and communications systems.

FAQ

What is the function of the M/S pin on CY7C024-55JXCT?

The M/S pin configures the device as Master (M/S = HIGH) or Slave (M/S = LOW) for data bus expansion. In Master mode, BUSY pins act as outputs to signal arbitration results to downstream slaves; in Slave mode, BUSY pins become inputs to receive those signals. This enables 32-bit+ memory width without external logic or discrete master/slave chips.

How do the semaphore latches operate in CY7C024-55JXCT?

The eight semaphore latches are accessed via SEM pin activation (CE held HIGH). Writing '0' to a semaphore grants exclusive ownership to that port; reading returns '0' if owned, '1' if free. Ownership is atomic and hardware-enforced - no software race conditions occur, and the winning port always sees deterministic state after tSWRD + tDOE delay.

Can CY7C024-55JXCT perform simultaneous reads from both ports to the same address?

Yes - the CY7C024-55JXCT supports true simultaneous reads from both ports to the same memory location without arbitration delay or BUSY assertion. This capability is inherent to its dual-port cell architecture and enables lock-free status monitoring and broadcast-style data distribution across processors.

What happens when both ports attempt to write to the same address within the tPS window?

When address contention occurs within 5 ns (tPS), on-chip arbitration grants access to one port deterministically and asserts BUSY to the other port after tBLA (address-match) or tBLC (CE-low) delay. The losing port's write is blocked until BUSY deasserts - ensuring data integrity without external intervention or undefined behavior.