Infineon Technologies CY7C027-20AXCT

Overview

CY7C027-20AXCT from Cypress Semiconductor is a 32K × 16 true dual-port static RAM with asynchronous operation, 20 ns maximum access time, 180 mA typical active current, and 0.05 mA typical CMOS-level standby current. It supports independent read/write access on left and right ports, includes on-chip arbitration logic, semaphores, and INT/BUSY flags, and is used in interprocessor communication buffers and dual-port video memory subsystems.

For engineers reviewing the CY7C027-20AXCT datasheet, CY7C027-20AXCT pinout, CY7C027-20AXCT application, or CY7C027-20AXCT equivalent, key selection criteria include dual-port arbitration behavior, M/S pin configuration for master/slave expansion, byte-select control granularity, and ISB3 standby current compliance at industrial temperature.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, data, and control buses per port (A0L–A14L/I/O0L–I/O15L/CE0L–OEL and A0R–A14R/I/O0R–I/O15R/CE0R–OER), enabling concurrent access to any memory location without external synchronization. The on-chip arbitration resolves contention via BUSY flag assertion and semaphore latches.

It integrates eight shared semaphore latches with exclusive ownership control per port, supports software handshaking via INT flags, and provides automatic power-down per port via CE-driven state transitions. The M/S pin configures the device as master (driving BUSY output) or slave (accepting BUSY input) in expanded 32-bit systems.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flat Pack (TQFP), 14 mm × 14 mm body, 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 IDT70V27L-20PF and IS61LV51216-20TQLI, CY7C027-20AXCT uniquely retains 5 V compatibility, integrated semaphores, and M/S expandability-making it irreplaceable in legacy industrial systems requiring zero-additional-logic dual-port expansion.

Availability

CY7C027-20AXCT is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame memory, and industrial PLC I/O mapping requiring stable component supply across long-lifecycle production programs.

Supply support for CY7C027-20AXCT 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.

CY7C027 belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic, contention-free memory sharing between heterogeneous processors in real-time embedded systems.

FAQ

What is the function of the M/S pin on CY7C027-20AXCT?

The M/S (Master/Slave) pin configures the device's BUSY signal behavior: when asserted HIGH, it operates as a master with BUSY driven as an output; when LOW, it acts as a slave with BUSY accepted as an input. This enables direct cascading of multiple CY7C027 devices into wider memory widths without external logic, preserving timing integrity across ports.

How does semaphore operation work in CY7C027-20AXCT?

The device contains eight dedicated semaphore latches, each controllable by only one port at a time. When a port asserts SEML or SEMR while holding CE active, it gains exclusive ownership of a selected latch-signaling that a shared resource (e.g., a memory region or peripheral) is in use. The other port must poll the latch before attempting access, preventing race conditions.

Can CY7C027-20AXCT operate with mixed voltage levels on left and right ports?

No. Both ports share a single VCC (5 V ±10%) and GND supply; there is no I/O voltage translation or dual-supply support. All inputs and outputs are referenced to the same 5 V rail, and interfacing with 3.3 V logic requires external level-shifting circuitry on address, data, and control lines.

What is the minimum pulse width required for CE or R/W signals?

The shortest valid CE or R/W pulse width is defined by tSCE (15 ns min) and tPWE (15 ns min), respectively. These values ensure reliable internal state capture and memory cell access. Pulses shorter than 15 ns may result in undefined behavior, including failed writes or invalid read data, due to insufficient setup/hold margins within the 0.35 µm CMOS process.