Cypress Semiconductor Corp CY7C1518V18-250BZC

Overview

CY7C1518V18 from Cypress Semiconductor is a 72-Mbit (4M × 18) synchronous pipelined DDR-II SRAM with 300 MHz clock support, 2-word burst architecture, and dual-clock DDR interface delivering 600 MHz effective data rate. It operates from a 1.8V core supply with HSTL I/O, integrates a Delay Lock Loop (DLL) for precise data placement, and targets high-bandwidth buffering in network packet processors and telecom line cards.

For engineers reviewing the CY7C1518V18 datasheet, CY7C1518V18 pinout, CY7C1518V18 application, or CY7C1518V18 equivalent, key selection criteria include its 4M × 18 organization, 165-ball FBGA package, echo clock (CQ/CQ) timing support, and synchronous self-timed write capability-critical for deterministic latency in burst-oriented memory subsystems.

Technical Context

The CY7C1518V18 implements a synchronous pipelined architecture where all address, control, and data inputs are registered on rising edges of K/K clocks. Its internal organization comprises two 2M × 18 arrays, with A0 driving the burst counter to sequence two 18-bit words per access.

Read data is output-synchronized to C/C clocks (or K/K in single-clock mode), while echo clocks CQ/CQ-phase-aligned to C/C-are provided to simplify system-level data capture. The DLL ensures accurate data-to-clock alignment, and ZQ enables dynamic output impedance tuning to match the 50-Ω system bus.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, 0.8 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed burst SRAM applications.

Compared with CY7C1520V18, CY7C1518V18 offers narrower 18-bit bus loading and lower pin count for space-constrained designs; versus IS42S16400F-6BLI, it delivers guaranteed zero-wait-state operation and no refresh overhead-critical for hard real-time embedded systems.

Availability

CY7C1518V18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, and industrial real-time controller buffer applications requiring stable component supply and long-term obsolescence planning.

Supply support for CY7C1518V18 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 high-performance memory, microcontrollers, and programmable analog/digital ICs for industrial, automotive, and communications markets.

The CY7C15xxV18 family was designed specifically for high-bandwidth, low-latency burst memory applications in networking and telecom infrastructure-emphasizing deterministic timing, DDR-II compatibility, and system-level signal integrity.

FAQ

What is the minimum supported clock frequency for CY7C1518V18?

The device supports operation down to DC (0 Hz) for static functionality, but its DDR timing specifications-including setup/hold windows and DLL lock range-are guaranteed only at frequencies ≥100 MHz. For full compliance with AC parameters in the datasheet, use ≥167 MHz as the practical lower limit.

Can CY7C1518V18 operate without the DLL enabled?

Yes-asserting DOFF LOW disables the DLL, reverting to fixed-delay output timing. However, AC timing parameters change significantly: tAC increases by up to 1.2 ns, and data valid window shrinks. This mode is intended only for power-sensitive or low-frequency applications where timing margin is sufficient.

How does ZQ calibration affect signal integrity?

ZQ calibration adjusts the DQ and CQ driver output impedance to match the system's 50-Ω transmission line. With a 240-Ω resistor tied to ground, the device sets driver strength to deliver 0.2 × 240 Ω = 48 Ω, minimizing reflections and ensuring clean eye diagrams at 600 Mbps DDR rates.

Is CY7C1518V18 compatible with standard HSTL-18 receivers?

Yes-the device complies with JEDEC HSTL Class I (1.8V) specifications: VDDQ = 1.8V, VOH = 1.5V min, VOL = 0.3V max, and VIH/VIL thresholds centered at VREF = 0.9V. It interfaces directly with FPGA or ASIC HSTL-18 I/O banks without level-shifting.