Infineon Technologies CY7C027-15AXI

Overview

CY7C027-15AXI from Cypress Semiconductor is a 32K × 16-bit true dual-port static RAM with asynchronous operation, 15 ns maximum access time, 5 V supply, and integrated on-chip arbitration logic for interprocessor communication in real-time embedded systems.

For engineers reviewing the CY7C027-15AXI datasheet, CY7C027-15AXI pinout, CY7C027-15AXI application, or CY7C027-15AXI equivalent, key selection criteria include simultaneous port access capability, BUSY/INT flag timing (12–20 ns), semaphore latch control, M/S pin for master/slave expansion, and industrial temperature support (–40°C to +85°C).

Technical Context

The device implements two fully independent asynchronous ports-left (L) and right (R)-each with dedicated address (A0L–A14L / A0R–A14R), data (I/O0L–I/O15L / I/O0R–I/O15R), and control lines (CE0/CE1, R/W, OE, UB/LB, SEM, INT, BUSY). Address space is 32K (15 address bits), and both ports can concurrently read/write the same memory location.

On-chip arbitration resolves contention via BUSY flag assertion (12–20 ns latency), while eight shared semaphores enable software handshaking; the M/S pin configures the device as master (drives BUSY output) or slave (accepts BUSY input), eliminating external logic for 32-bit+ memory expansion.

Key Specifications

Pinout & Package

Delivered in a 100-pin Thin Quad Plastic Flatpack (TQFP) package with exposed thermal pad (RoHS-compliant, Pb-free). Pin layout supports symmetrical left/right port mirroring and master/slave configuration via dedicated M/S pin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V27L15PF and IS61LV51216AL-15TQLI, CY7C027-15AXI uniquely integrates M/S configuration, hardware semaphores, and dual-BUSY arbitration-enabling drop-in replacement in legacy 5 V interprocessor designs without redesigning control logic or adding discrete components.

Availability

CY7C027-15AXI is available at Aetrix Electronics and suitable for industrial automation, communications gateways, and embedded graphics systems requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for CY7C027-15AXI 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) is a fabless semiconductor company specializing in memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.

CY7C027 belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor communication in real-time embedded systems where hardware arbitration and shared-resource synchronization are critical.

FAQ

What is the function of the M/S pin on CY7C027-15AXI?

The M/S (Master/Slave) pin configures the device for 32-bit or wider memory expansion: when asserted HIGH, it operates as a master driving BUSY output; when LOW, it functions as a slave accepting BUSY input. This eliminates external logic for multi-device synchronization and is essential for building scalable dual-port memory subsystems without added propagation delay.

How does the semaphore logic work in CY7C027-15AXI?

The device includes eight dedicated hardware semaphore latches, each controllable by only one port at a time. When a port asserts SEML or SEMR, it gains exclusive access to a latch-signaling resource ownership to the other port. This atomic lock mechanism prevents race conditions during shared-memory updates and requires no software polling or timer-based coordination.

Can CY7C027-15AXI operate in data retention mode? What are the requirements?

Yes-CY7C027-15AXI supports data retention with VCC reduced to 2.0 V minimum. To maintain memory contents, CE must be held HIGH within VCC to VCC – 0.2 V, and the device draws only 1.5 mA typical (ICCDR1). This mode is validated across –40°C to +85°C and enables battery-backed operation in power-fail scenarios.

What is the timing relationship between BUSY assertion and address match?

When both ports attempt access to the same memory location, BUSY asserts within 12–20 ns (tBLA) after the conflicting address appears on either port's address bus. This fixed, datasheet-guaranteed latency allows deterministic design of timeout handlers and ensures predictable worst-case arbitration response across voltage and temperature ranges.