Infineon Technologies CY7C018-15AC

Overview

CY7C018-15AC from Cypress Semiconductor is a 64K × 9 true dual-port static RAM with independent left/right ports, 15 ns maximum access time, 5 V supply, and integrated on-chip arbitration logic. It supports simultaneous asynchronous read/write to the same memory location and enables master/slave expansion for 18-bit or wider data buses in interprocessor communication systems.

For engineers reviewing the CY7C018-15AC datasheet, CY7C018-15AC pinout, CY7C018-15AC application, or CY7C018-15AC equivalent, key selection criteria include dual-port arbitration timing (tBLA/tBHA = 15 ns), semaphore latch count (8), BUSY/INT flag behavior, and TQFP-100 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The CY7C018-15AC implements fully asynchronous dual-port operation with separate address, data, and control buses per port (A0L–A15L/I/O0L–I/O8L/R/WL/OEL/CEL and A0R–A15R/I/O0R–I/O8R/R/WR/OER/CER). Arbitration is handled by hardware BUSY flags and eight shared semaphore latches, each controllable by only one port at a time.

It features automatic per-port power-down via CE pins, CMOS-level standby current of 0.05 mA (ISB3), and dual chip enable (CE0/CE1) logic requiring CE0 ≤ VIL and CE1 ≥ VIH for activation. The M/S pin configures master/slave mode without external logic for 18-bit bus expansion.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Plastic Flatpack (TQFP), 14 mm × 14 mm, 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7008L15PF, CY7C018-15AC integrates master/slave configuration into a single device, reducing component count and improving timing predictability; versus IS61LV5128AL-15K, it delivers hardware arbitration and inter-port signaling essential for real-time multiprocessor systems.

Availability

CY7C018-15AC is available at Aetrix Electronics and suitable for interprocessor communication, dual-port video buffering, and industrial PLC data exchange requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7C018-15AC 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 system-on-chip solutions for industrial, automotive, and communications markets.

The CY7C0xx dual-port SRAM product line was designed specifically for deterministic, low-latency interprocessor communication in real-time embedded systems requiring hardware-managed memory coherency.

FAQ

What is the function of the M/S pin on CY7C018-15AC?

The M/S (Master/Slave) pin configures the device for 18-bit data bus expansion without external logic: when asserted high, it enables master mode with BUSYR as output; when low, it enables slave mode with BUSYR as input. This allows stacking two CY7C018-15AC devices to form a 64K × 18 memory with automatic contention resolution.

How does semaphore operation work in CY7C018-15AC?

Semaphore operation uses eight shared latches controlled via SEML/SEMR and CE pins: to access semaphores, CE must be HIGH and SEM LOW. Each latch can be acquired or released atomically by one port, signaling resource ownership to the other port - enabling lock-free inter-processor synchronization without polling.

Can CY7C018-15AC operate in data retention mode? What are the conditions?

Yes - data retention is guaranteed when CE is held HIGH within VCC to VCC – 0.2 V, with supply voltage ≥ 2.0 V. At VCCDR = 2 V, ICCDR1 is 1.5 mA max. The device retains data during brown-out events if CE remains valid throughout power transitions and VCC stays above 4.5 V before resuming operation.

What is the difference between ISB1 and ISB3 standby current specifications?

ISB1 (50 mA typical) applies when both ports are held at TTL input levels (VIH/VIL), reflecting higher leakage in noisy industrial environments; ISB3 (0.05 mA typical) applies when both ports are at CMOS levels (≥ VCC – 0.2 V), enabling ultra-low-power retention. Designers select based on actual control signal termination and noise immunity requirements.