Infineon Technologies CY7C024-25JXC

Overview

CY7C024-25JXC from Cypress Semiconductor is a 4K × 16-bit true dual-port static RAM with independent left/right ports, on-chip arbitration logic, semaphore latches, and BUSY/INT flags. It supports simultaneous asynchronous reads of the same memory location, delivers 25 ns access time, draws 160 mA typical operating current, and operates in 84-pin PLCC package. It is used in interprocessor communication buffers and dual-port video frame stores.

For engineers reviewing the CY7C024-25JXC datasheet, CY7C024-25JXC pinout, CY7C024-25JXC application, or CY7C024-25JXC equivalent, key selection criteria include dual-port arbitration timing (tPS = 10 ns), semaphore latch count (8), master/slave expandability via M/S pin, and separate upper/lower byte enables for 16-bit data bus control.

Technical Context

The CY7C024-25JXC implements fully asynchronous dual-port operation with independent CE, R/W, and OE controls per port. Its arbitration logic resolves contention using tPS (10 ns setup window) and asserts BUSY within tBLA (5 ns) or tBLC (8 ns) to indicate access denial.

It integrates eight dedicated semaphore latches accessible via SEM pin with A0–A2 addressing; each latch supports token-passing between ports with deterministic ownership transfer-writing '0' claims, '1' releases-and outputs mirrored values across ports to enforce mutual exclusion.

Key Specifications

Pinout & Package

84-pin Plastic Leaded Chip Carrier (PLCC) with J-bend leads, body size 29.31 mm × 29.31 mm, 1.27 mm pitch, RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L25PF and CY7C028-25AC, CY7C024-25JXC offers optimal balance of on-chip arbitration, hardware semaphores, and compact 84-pin PLCC packaging-reducing BOM count and layout complexity for mid-size interprocessor buffers where memory depth ≤4K suffices.

Availability

CY7C024-25JXC is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame stores, communications protocol stack buffers, and industrial PLC I/O mapping memory requiring stable component supply and long-term obsolescence management.

Supply support for CY7C024-25JXC 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-reliability mixed-signal and memory ICs for industrial, automotive, and communications infrastructure applications.

CY7C024-25JXC belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor data exchange in real-time embedded systems with minimal external logic.

FAQ

What is the function of the M/S pin on CY7C024-25JXC?

The M/S pin configures the device as master (M/S = HIGH) or slave (M/S = LOW) for bus-width expansion. In master mode, BUSY pins are outputs that drive slave BUSY inputs; in slave mode, BUSY pins become inputs. This enables 32-bit+ memory configurations without external logic, using only daisy-chained BUSY signals and shared address/data buses.

How do the semaphore latches operate in CY7C024-25JXC?

The eight semaphore latches are accessed via SEM pin with A0–A2 addressing. Writing '0' to a latch grants ownership to that port; writing '1' releases it. Ownership is enforced by cross-port mirroring: only the side reading '0' may modify the latch. The latch value appears on all 16 I/O lines during read, and is held stable during concurrent writes from the opposite port.

Can CY7C024-25JXC perform simultaneous read operations on the same memory location?

Yes. The CY7C024-25JXC supports true simultaneous reads from both ports to the same address without arbitration delay or BUSY assertion. This capability is inherent to its dual-port memory cell architecture and enables zero-latency data sharing between processors or functional blocks accessing identical configuration or status data.

What timing parameter governs arbitration resolution when both ports access the same address?

Arbitration resolution is governed by tPS (Port Setup Time), specified as 10 ns. If both ports assert CE and present matching addresses within 10 ns of each other, on-chip logic deterministically grants access to one port and asserts BUSY on the other. Violating tPS does not cause failure but makes the winning port unpredictable, requiring system-level timeout handling.