Cypress Semiconductor Corp CY7C1564XV18-450BZXC

Overview

CY7C1564XV18 from Cypress Semiconductor is a 2M × 36, 72-Mbit QDR® II+ Xtreme SRAM with separate read/write ports, 450 MHz clock operation (900 Mbps DDR data rate), 2.5-cycle read latency when DOFF = HIGH, and HSTL I/Os supporting 1.5 V VDDQ. It delivers full data coherency and synchronous self-timed writes for high-bandwidth packet buffering in network line cards.

For engineers reviewing the CY7C1564XV18 datasheet, CY7C1564XV18 pinout, CY7C1564XV18 application, or CY7C1564XV18 equivalent, key selection criteria include burst depth (2-word), dual-clock timing (K/K), echo clock support (CQ/CQ), QVLD signaling, and byte-write select granularity (BWS[3:0]) for precise memory update control.

Technical Context

The CY7C1564XV18 implements a true dual-port QDR II+ architecture with physically independent read and write data paths-no bus turnaround required. Its 20-bit address bus latches both read and write addresses on alternating rising edges of K and K clocks, enabling concurrent access to the 2M × 36 array.

It integrates a PLL for accurate data placement and supports two operational modes: QDR-II+ mode (2.5-cycle read latency, up to 450 MHz) when DOFF = HIGH, and QDR-I mode (1-cycle latency, ≤167 MHz) when DOFF = LOW. Echo clocks CQ and CQ are free-running, edge-aligned with K and K respectively, simplifying high-speed data capture.

Key Specifications

Pinout & Package

Package: 165-ball FBGA (13 mm × 15 mm × 1.4 mm), RoHS-compliant, with 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102432BLL-15BLI, the CY7C1564XV18 uniquely supports configurable latency (1- or 2.5-cycle), echo-clock–assisted timing closure, and 450 MHz operation - making it optimal for next-generation packet-processing pipelines requiring deterministic high-throughput memory access.

Availability

CY7C1564XV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, high-speed test equipment memory, and FPGA-based protocol analyzer applications requiring stable component supply and long-term industrial availability.

Supply support for CY7C1564XV18 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) designs high-performance memory and programmable solutions for networking, automotive, and industrial systems.

The QDR® II+ Xtreme SRAM product line targets ultra-low-latency, high-bandwidth memory subsystems in packet-switched infrastructure - emphasizing concurrent read/write, deterministic timing, and FPGA-friendly signaling.

FAQ

What is the function of the DOFF pin on CY7C1564XV18?

The DOFF pin controls internal PLL operation: when pulled HIGH, the device runs in QDR-II+ mode with 2.5-cycle read latency and full 450 MHz capability; when pulled LOW, the PLL disables and the device reverts to QDR-I timing with 1-cycle latency and reduced maximum frequency (≤167 MHz). This allows hardware-selectable latency/bandwidth trade-offs without firmware changes.

How does the CY7C1564XV18 handle partial writes?

Partial writes are managed via four active-low Byte Write Select signals (BWS[3:0]), each controlling a 9-bit segment of the 36-bit D[35:0] bus. When a BWS bit is deasserted, the corresponding 9-bit byte remains unaltered in memory. This enables atomic updates to specific fields within wide data structures without requiring read-modify-write sequences.

What is the purpose of the CQ and CQ echo clocks?

CQ and CQ are free-running, edge-aligned output copies of the K and K input clocks. They provide source-synchronous timing references for downstream receivers, eliminating setup/hold uncertainty caused by PCB trace skew. Unlike system clocks, they track process/voltage/temperature variations of the SRAM's internal clock path - enabling robust data capture at 900 Mbps without external delay-locked loops.

Can CY7C1564XV18 be used in depth-expanded configurations?

Yes - depth expansion is supported using independent RPS (read port select) and WPS (write port select) inputs. Multiple devices can share the same address and data buses while being individually enabled per port, allowing seamless extension of memory depth (e.g., stacking two 2M × 36 devices to create 4M × 36) without external address decoding logic.