Infineon Technologies CY7C144-15JXC

Overview

CY7C144-15JXC from Cypress Semiconductor is an 8K × 8 true dual-port static RAM with independent asynchronous access on left and right ports, 15 ns access time, TTL-compatible I/O, and integrated semaphore/INT/BUSY arbitration logic. It enables interprocessor communication in real-time embedded systems requiring deterministic memory coherency, such as video frame buffering and multiprocessor control subsystems.

For engineers reviewing the CY7C144-15JXC datasheet, CY7C144-15JXC pinout, CY7C144-15JXC application, or CY7C144-15JXC equivalent, key selection criteria include dual-port arbitration behavior, semaphore latch timing (tSOP, tSWRD), master/slave expansion capability via M/S pin, and industrial-grade standby current (ISB1 = 60 mA max at 0–70°C).

Technical Context

The CY7C144-15JXC implements hardware-based arbitration using dedicated BUSY outputs (push-pull, no pull-up required) that assert within tBLA (≤15 ns) of address match to resolve simultaneous access contention. Its semaphore subsystem comprises eight independent latches accessed via SEML/SEMR and A0–A2, enabling software-controlled resource locking without external logic.

Each port features fully independent control: CE, R/W, OE, INT, and BUSY signals operate autonomously; automatic power-down is triggered per-port by CE deassertion or SEM assertion while CE remains high. The M/S pin configures BUSYL/BUSYR as outputs (master) or inputs (slave), supporting 16-bit+ bus width expansion without discrete glue logic.

Key Specifications

Pinout & Package

Package: 68-pin PLCC (Plastic Leaded Chip Carrier), body size 24.2 mm × 24.2 mm, lead pitch 1.27 mm, RoHS-compliant Pb-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L15PF and ISSI IS61LV5128-15K, the CY7C144-15JXC uniquely integrates M/S-configurable bus expansion, push-pull INT/BUSY, and eight hardware semaphores - making it the sole option for deterministic, glueless dual-processor 5 V designs requiring sub-20 ns arbitration.

Availability

CY7C144-15JXC is available at Aetrix Electronics and suitable for video frame buffering, multiprocessor control systems, communications protocol stack buffering, and dual-processor embedded instrumentation requiring stable component supply across extended product lifecycles.

Supply support for CY7C144-15JXC 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 memory and programmable solutions for industrial, automotive, and communications markets, with emphasis on integration and system-level functionality.

The CY7C144 series belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration and resource locking are mandatory.

FAQ

What is the function of the M/S pin on CY7C144-15JXC?

The M/S (Master/Slave Select) pin configures BUSYL and BUSYR as outputs (M/S = HIGH, master mode) or inputs (M/S = LOW, slave mode). In master mode, BUSY signals arbitration results to downstream slave devices; in slave mode, BUSY accepts arbitration input from a master. This enables seamless 16-bit or wider memory expansion without external logic or discrete buffers.

How do the semaphore latches operate in CY7C144-15JXC?

The eight semaphore latches are accessed by asserting SEML or SEMR LOW while keeping CE HIGH. A0–A2 select the latch; writing a 0 to I/O0 locks the resource (latch outputs 0 on requesting port, 1 on opposing port); reading returns the current state. Initialization requires writing 1 to all semaphores from both ports at power-up to ensure clean release state.

Can INTL and INTR be used without external pull-up resistors?

Yes. INTL and INTR are push-pull outputs per datasheet specification (Document #: 38-06034 Rev. *E, Page 4), meaning they actively drive HIGH and LOW states without requiring external pull-up resistors. This simplifies board design and ensures reliable interrupt signaling in noisy industrial environments.

What is the minimum pulse width requirement for R/WL and R/WR signals?

The R/WL and R/WR signals require a minimum pulse width of 20 ns (per "Maximum Ratings" table footnote [6]) to ensure valid setup and hold timing for internal write latching. Violating this spec may cause intermittent write failures or metastability in the address/data path, especially at temperature extremes or voltage corners.