Infineon Technologies CY7C016A-15AXC

Overview

CY7C016A-15AXC from Cypress Semiconductor is a 16K × 9 true dual-port static RAM with independent left/right address, data, and control buses, 15 ns access time, 5 V supply, and integrated semaphore/INT/BUSY arbitration logic. It enables simultaneous asynchronous read/write access to shared memory in interprocessor communication systems, video frame buffers, and real-time control co-processors.

For engineers reviewing the CY7C016A-15AXC datasheet, CY7C016A-15AXC pinout, CY7C016A-15AXC application, or CY7C016A-15AXC equivalent, key selection factors include x9 data width support, master/slave expandability, on-chip semaphores for resource locking, and 80-pin TQFP packaging with CMOS-level standby current of 0.05 mA.

Technical Context

This device implements a fully asynchronous dual-port SRAM architecture with separate address decoders, I/O drivers, and arbitration logic per port. Each port features independent CE, OE, R/W, BUSY, INT, and SEM signals, enabling deterministic contention resolution without external logic.

The on-chip semaphore block contains eight dedicated latches accessible via A0–A2 with SEM assertion, supporting atomic resource allocation between ports. The M/S pin configures BUSY as output (master) or input (slave), enabling seamless 18-bit+ memory expansion using multiple devices.

Key Specifications

Pinout & Package

Package: 80-pin Thin Quad Flat Package (TQFP), RoHS-compliant, body size 12 mm × 12 mm, 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 CY7C026V-15AC, CY7C016A-15AXC uniquely combines 5 V compatibility, on-chip semaphores, and M/S expandability in a single 80-pin package-making it optimal for cost-sensitive, legacy 5 V interprocessor designs requiring zero-additional-logic arbitration.

Availability

CY7C016A-15AXC is available at Aetrix Electronics and suitable for interprocessor communication, video buffering, and real-time control applications requiring stable component supply across extended production lifecycles.

Supply support for CY7C016A-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 U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable system-on-chip solutions.

CY7C016A belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between independent processors in embedded control and communications systems.

FAQ

What is the function of the M/S pin on CY7C016A-15AXC?

The M/S (Master/Slave) pin configures BUSY signal direction: when HIGH, BUSY pins act as outputs (master mode), driving arbitration results to slave devices; when LOW, BUSY pins become inputs (slave mode), accepting arbitration signals from a master. This enables seamless 18-bit+ memory expansion without external logic or discrete bus controllers.

How do the semaphore latches operate in CY7C016A-15AXC?

The device provides eight dedicated semaphore latches accessed via SEML/SEMR assertion and A0–A2 address lines. Writing '0' to a semaphore grants exclusive ownership to that port; reading returns the current latch state. Ownership is atomic and hardware-enforced-no software intervention or polling delay is required to acquire or release shared resources.

Can CY7C016A-15AXC be used in a single-port configuration?

Yes-either port can be disabled by holding its CE pin HIGH, effectively converting the device into a standard 16K × 9 SRAM with full 9-bit I/O. The unused port's BUSY, INT, and SEM signals remain inactive, and the internal arbitration logic is bypassed, reducing dynamic power consumption.

What is the purpose of the two mailbox addresses (7FFEh and 7FFFh)?

Address 7FFEh serves as the left-port mailbox; 7FFFh as the right-port mailbox. Writing to the opposite port's mailbox asserts its INT flag, signaling pending data. Reading the mailbox clears the interrupt. These locations support hardware-synchronized message passing without polling or timer overhead-critical for real-time interprocessor handshaking.