Infineon Technologies CY7C144E-15AXIT

Overview

CY7C144E-15AXIT from Cypress Semiconductor is an 8K × 8 true dual-port static RAM with integrated semaphore, interrupt, and busy arbitration logic. It enables simultaneous asynchronous read access to the same memory location by two independent ports, 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. It is used in interprocessor communication buffers and dual-port video memory subsystems.

For engineers reviewing the CY7C144E-15AXIT datasheet, CY7C144E-15AXIT pinout, CY7C144E-15AXIT application, or CY7C144E-15AXIT 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 embedded systems.

Technical Context

The CY7C144E-15AXIT implements fully asynchronous dual-port operation with independent CE, OE, and R/W controls per port. Its on-chip arbitration resolves contention via push-pull BUSY outputs (in master mode) and deterministic tPS-based priority resolution.

Semaphore logic comprises eight shared latches accessed via SEM enable and A0–A2 address bits; INT flags are set/cleared by writes to dedicated addresses (1FFE/1FFF) and operate as push-pull outputs without pull-up resistors. The M/S pin configures BUSY as output (master) or input (slave) to support cascaded 16-bit memory systems.

Key Specifications

Pinout & Package

Package: 64-pin Thin Quad Flat Package (TQFP), RoHS-compliant, surface-mount, 10 mm × 10 mm footprint with 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V27L15PF and IS61WV5128BLL-15MLI, the CY7C144E-15AXIT uniquely integrates all arbitration primitives (SEM/INT/BUSY) in a single 64-pin package, eliminating external logic while delivering guaranteed deterministic access - essential for real-time interprocessor coordination.

Availability

CY7C144E-15AXIT 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 manufacturability.

Supply support for CY7C144E-15AXIT 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-performance mixed-signal ICs for embedded control, connectivity, and memory applications, with headquarters in San Jose, CA.

The CY7C144E belongs to Cypress's dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor data exchange in real-time embedded systems where hardware arbitration is mandatory.

FAQ

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

The M/S (Master/Slave) pin configures the device's BUSY signal behavior: when HIGH, BUSY pins act as push-pull outputs for master-mode arbitration signaling; when LOW, they become inputs for slave-mode operation. This enables seamless daisy-chaining of multiple CY7C144E devices to build wider memory buses without external logic, directly supporting 16-bit or greater data paths.

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

The eight semaphore latches are accessed via SEML/SEMR assertion and A0–A2 address bits. Writing a 0 to a semaphore grants exclusive ownership to that port; reading returns 0 if owned or 1 if free. Ownership is atomic and hardware-enforced - no software lock instructions or external arbitration are needed. Initialization requires writing 1 to all semaphores at power-up from both ports.

Can CY7C144E-15AXIT perform simultaneous read operations on the same memory address?

Yes - the CY7C144E-15AXIT uses true dual-port memory cells that allow concurrent reads from identical addresses on both ports with no timing penalty, data corruption, or arbitration delay. This capability is fundamental to its role in real-time video buffering and interprocessor mailbox applications where deterministic latency is required.

What are the electrical requirements for the INT and BUSY pins?

INTL and INTR are push-pull outputs requiring no external pull-up resistors; they drive TTL-compatible logic levels directly. BUSYL and BUSYR operate as push-pull outputs in master mode (M/S = HIGH) and as CMOS-level inputs in slave mode (M/S = LOW). All four signals meet standard TTL voltage thresholds (V_OH ≥ 2.4 V, V_OL ≤ 0.4 V) under specified load conditions.