Infineon Technologies CY7C024-55AXC

Overview

CY7C024-55AXC 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 a Pb-free 84-pin PLCC.

For engineers reviewing the CY7C024-55AXC datasheet, CY7C024-55AXC pinout, CY7C024-55AXC application, or CY7C024-55AXC equivalent, key selection criteria include dual-port contention resolution timing (tPS = 5 ns), semaphore latch behavior, master/slave expandability via M/S pin, and compatibility with 5 V TTL/CMOS logic families in industrial temperature range (–40°C to +85°C).

Technical Context

The CY7C024-55AXC implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A11L / A0R–A11R, I/O0L–I/O15L / I/O0R–I/O15R), enabling concurrent read/write operations to any memory location. Its on-chip arbitration resolves simultaneous access via BUSY assertion (tBLA = 5 ns, tBLC = 5 ns) and guarantees deterministic ownership when tPS ≤ 5 ns is met.

Semaphore logic comprises eight dedicated latches accessible via SEM pin, with A0–A2 selecting latch index and I/O0 controlling token state (0 = claimed, 1 = free); interrupt signaling uses upper two memory locations (FFEh/FFFh) as mailboxes, with INT flag reset only upon mailbox read by owning port.

Key Specifications

Pinout & Package

Package: 84-pin Pb-free PLCC (Plastic Leaded Chip Carrier), body size 29.31 mm × 29.31 mm, lead pitch 1.27 mm, JEDEC MO-048AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L15PF and CY7C028-55AXC, the CY7C024-55AXC offers optimal fit for cost-sensitive 5 V industrial systems needing proven 55 ns dual-port latency and direct drop-in replacement for legacy Cypress designs - balancing memory depth, voltage compatibility, and qualification history.

Availability

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

Supply support for CY7C024-55AXC 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 fabless semiconductor company specializing in high-performance memory, PSoC, and USB solutions for industrial, automotive, and consumer applications.

CY7C024-55AXC belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic real-time multiprocessing systems where hardware-enforced memory coherency and low-latency inter-processor signaling are critical.

FAQ

What is the function of the M/S pin in CY7C024-55AXC?

The M/S pin configures the device as master (M/S = HIGH) or slave (M/S = LOW). In master mode, BUSYL and BUSYR are outputs used to drive slave devices' BUSY inputs during 32-bit expansion; in slave mode, those pins become inputs accepting arbitration signals from a master. This eliminates external logic for word-width scaling.

How does semaphore arbitration work without software polling?

Semaphore latches are accessed via SEM pin with A0–A2 selecting one of eight tokens. Writing '0' claims the latch; reading returns '0' if successful or '1' if contested. The read value is latched to prevent corruption during cross-port writes, enabling atomic claim/release without CPU intervention or delay loops.

Can INTL and INTR be used simultaneously for bidirectional messaging?

Yes - INTL asserts when right port writes to FFEh (left mailbox); INTR asserts when left port writes to FFFh (right mailbox). Each flag resets only upon read of its respective mailbox, allowing full-duplex, self-synchronizing message passing without shared registers or external interrupt controllers.

What happens during simultaneous access to the same memory location?

When both ports assert CE within 5 ns (tPS), on-chip arbitration asserts BUSY on the losing port after tBLA = 5 ns. The winning port proceeds with access; the losing port must wait until BUSY deasserts before retrying. If tPS is violated, arbitration outcome is undefined - strict board layout matching is required for deterministic behavior.