Infineon Technologies CY7C026A-15AXC

Overview

CY7C026A-15AXC from Cypress Semiconductor is a 16K × 16 true dual-port static RAM with asynchronous operation, 15 ns access time, 5 V supply, and integrated on-chip arbitration logic for simultaneous port access. It supports independent read/write operations on left and right ports, includes semaphore latches and INT/BUSY flags for inter-processor communication, and is used in multiprocessor bus arbitration and video frame buffer systems.

For engineers reviewing the CY7C026A-15AXC datasheet, CY7C026A-15AXC pinout, CY7C026A-15AXC application, or CY7C026A-15AXC equivalent, key selection criteria include dual-port contention resolution timing (tPS = 5 ns), CMOS-level standby current (ISB3 = 0.05 mA), master/slave expandability via M/S pin, and TQFP-100 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The device implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A13L/I/O0L–I/O15L/CEL/OEL/R/WL and A0R–A13R/I/O0R–I/O15R/CER/OER/R/WR). Arbitration uses hardware BUSY signaling with tBLA = 5 ns and tBLC = 5 ns response latency to resolve same-location access conflicts.

On-chip semaphores consist of eight dedicated latches accessible via SEM pin assertion, enabling software-controlled resource locking without external logic. The M/S pin configures BUSY as output (master) or input (slave), allowing seamless 32-bit expansion using multiple devices without discrete glue logic.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), 14 mm × 14 mm body, 0.5 mm lead pitch, Pb-free compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V27L15PF and IS61LV25616AL-15TQLI, CY7C026A-15AXC uniquely delivers 5 V compatibility, integrated BUSY arbitration, and on-chip semaphores - making it the only drop-in solution for legacy industrial designs requiring zero-latency contention resolution without voltage translation or external logic.

Availability

CY7C026A-15AXC is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame buffers, industrial PLC I/O mapping memory, and telecom line card status buffers requiring stable component supply across extended product lifecycles.

Supply support for CY7C026A-15AXC 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.

CY7C026A belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration and semaphore support are mandatory.

FAQ

What is the function of the M/S pin in CY7C026A-15AXC?

The M/S (Master/Slave) pin configures the device's BUSY signal behavior: when HIGH, BUSY pins act as outputs for master-mode arbitration signaling to slave devices; when LOW, BUSY pins become inputs for receiving arbitration results from a master. This enables seamless 32-bit memory expansion using multiple CY7C026A-15AXC units without external logic, with tBLC = 5 ns settling time required before slave write initiation.

How do the semaphore latches operate in CY7C026A-15AXC?

The device includes eight dedicated semaphore latches accessed via SEML/SEMR assertion. Writing '0' to a semaphore grants exclusive ownership to that port; reading returns '0' if owned or '1' if free. Ownership is atomic and conflict-resolved in hardware. Semaphore access requires tSOP = 10 ns delay between SEM deassertion and read, with tSWRD + tDOE = 15 ns total latency for value availability.

Can CY7C026A-15AXC operate with mixed voltage interfaces?

No - CY7C026A-15AXC is strictly a 5 V ±10% device with TTL-compatible VIH = 2.2 V and VIL = 0.8 V thresholds. Its I/O structure does not support mixed-voltage operation or level shifting. Interfacing with 3.3 V processors requires external voltage translators such as TXB0108 or SN74AVC4T245 to maintain signal integrity and avoid DC loading.

What happens during simultaneous access to the same memory location?

When both ports attempt access within tPS = 5 ns, on-chip arbitration asserts BUSYL/BUSYR to indicate contention. The winning port gains immediate access; the losing port experiences flowthrough delay (tDDD = 15 ns) before valid data appears. If tPS is violated, access priority becomes unpredictable. BUSY remains asserted until the winning port completes its cycle, preventing metastability in downstream logic.