Infineon Technologies CY7C144E-15AXCT

Overview

CY7C144E-15AXCT from Cypress Semiconductor is an 8K × 8 true dual-port static RAM with integrated semaphore, interrupt, and busy arbitration logic. It enables simultaneous asynchronous reads/writes to the same memory location, supports master/slave expansion to 16-bit bus width, and delivers 15 ns access time with 180 mA typical active current and 0.05 mA CMOS standby current. Used in interprocessor communication buffers and dual-port video memory subsystems.

For engineers reviewing the CY7C144E-15AXCT datasheet, CY7C144E-15AXCT pinout, CY7C144E-15AXCT application, or CY7C144E-15AXCT equivalent, key selection criteria include dual-port arbitration behavior (BUSY/INT/SEM), M/S-configurable bus expansion, TTL-compatible I/O, and 64-pin TQFP packaging for high-density PCB layouts.

Technical Context

The CY7C144E-15AXCT implements fully asynchronous dual-port operation with independent CE, OE, and R/W control per port. Its on-chip arbitration uses push-pull BUSY outputs (in master mode) and deterministic tPS-based resolution for address-contention events.

Semaphore logic comprises eight shared latches accessed via SEM enable and A0–A2; INT flags are set/cleared by writes to fixed addresses (1FFE/1FFF) and operate as push-pull outputs without external pull-ups. The M/S pin configures BUSY as output (master) or input (slave) to support cascaded wide-memory systems.

Key Specifications

Pinout & Package

64-pin Thin Quad Flat Package (TQFP) with exposed thermal pad; 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 IDT70V25L15PF and CY7C145E-15AXCT, the CY7C144E-15AXCT uniquely integrates M/S-configurable bus expansion, hardware semaphores, and 5 V TTL compatibility-making it optimal for legacy industrial and communications systems requiring minimal external logic.

Availability

CY7C144E-15AXCT is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame buffers, and industrial PLC data exchange modules requiring stable component supply and long-term lifecycle support.

Supply support for CY7C144E-15AXCT 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.

The CY7C144E belongs to Cypress's dual-port SRAM product line, engineered specifically for deterministic multi-processor memory sharing in real-time embedded systems where hardware arbitration and low-latency access are critical.

FAQ

What is the function of the M/S pin on CY7C144E-15AXCT?

The M/S (Master/Slave) pin configures the device's BUSY pin behavior: when HIGH, BUSY pins act as push-pull outputs for master-mode arbitration signaling; when LOW, they become inputs for slave-mode daisy-chaining. This enables 16-bit or wider memory expansion without external logic or separate master/slave devices, directly supporting scalable multiprocessing architectures.

How do the semaphore latches operate in CY7C144E-15AXCT?

The eight semaphore latches are accessed by asserting SEM LOW and using A0–A2 as address lines; only I/O0 is used for writing (0 = request, 1 = release). Each latch is owned exclusively by the port that first writes 0, and ownership transfers immediately upon release-enabling lock-free resource sharing between ports without software intervention or polling delays.

Can CY7C144E-15AXCT operate with mixed voltage interfaces?

No-CY7C144E-15AXCT is strictly a 5 V ±10% device with TTL-compatible I/O thresholds. It does not support mixed-voltage operation or 3.3 V interfaces. Level-shifting circuitry is required when interfacing with lower-voltage processors, and all control and data signals must remain within the specified 5 V operating range to ensure reliable arbitration and data integrity.

What happens during simultaneous access to the same memory location?

When both ports attempt access within tPS (10 ns), on-chip arbitration asserts BUSY on the losing port and grants access to the winning port. The winning port completes its operation deterministically; the losing port sees BUSY asserted and must retry. No data corruption occurs, and the outcome is guaranteed-unlike software-based schemes that risk race conditions or livelock.