Cypress Semiconductor Corp CY7C2565XV18-633BZC

Overview

CY7C2565XV18 from Cypress Semiconductor is a 2M × 36, 72-Mbit QDR® II+ Xtreme SRAM with four-word burst architecture, 2.5-cycle read latency (DOFF = HIGH), 633 MHz clock operation, and on-die termination (ODT) for D[35:0], BWS[3:0], and K/K inputs-designed for high-bandwidth packet buffering in network line cards and telecom switching fabric.

For engineers reviewing the CY7C2565XV18 datasheet, CY7C2565XV18 pinout, CY7C2565XV18 application, or CY7C2565XV18 equivalent, key selection criteria include DDR read/write ports, echo clocks (CQ/CQ) for timing margin, QVLD data validity signaling, HSTL I/O compatibility, and 165-ball FBGA (13 × 15 × 1.4 mm) package constraints.

Technical Context

The CY7C2565XV18 implements a synchronous pipelined QDR II+ architecture with physically separate read and write ports, enabling true concurrent read/write transactions without bus turnaround. It uses dual input clocks (K and K) sampled only on rising edges, with echo clocks (CQ/CQ) phase-aligned to simplify high-speed data capture at 1266 MT/s.

Internal depth expansion is supported via independent RPS/WPS controls and four byte-write select inputs (BWS[3:0]), each gating 9-bit segments of the 36-bit data bus. The device integrates a PLL for precise data placement and supports programmable ODT impedance ranges (RQ/1.66 or RQ/3.33) selected by the ODT pin during power-up initialization.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body height, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36120 and IS61WV102436B, the CY7C2565XV18 delivers higher bandwidth (1266 vs. 1100/400 MT/s), eliminates external termination components via ODT, and provides deterministic timing via echo clocks and QVLD-making it optimal for new high-speed data path designs.

Availability

CY7C2565XV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom switch fabric, high-speed test equipment, and rad-hard data acquisition requiring stable component supply across extended product lifecycles.

Supply support for CY7C2565XV18 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 demanding communications and industrial applications.

The QDR® II+ Xtreme SRAM product line targets ultra-low-latency, high-throughput data buffering in networking, telecom, and test instrumentation-emphasizing concurrent access, timing predictability, and signal integrity at multi-GHz rates.

FAQ

What is the function of the DOFF pin on CY7C2565XV18?

The DOFF (Data Output OFF) pin configures read latency mode: when asserted HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency; when LOW or tied to VSS, it reverts to QDR I mode with 1-cycle latency. This pin is sampled at power-up and latched internally-no runtime reconfiguration is supported.

How does on-die termination (ODT) work on CY7C2565XV18?

ODT applies programmable termination resistance to D[35:0], BWS[3:0], and K/K inputs using an external ZQ resistor (175–350 Ω). The ODT pin selects the range: LOW enables RQ/3.33 (~53–105 Ω), HIGH/floating enables RQ/1.66 (~105–212 Ω). Termination is active only during input sampling windows, reducing static power versus always-on resistors.

Can CY7C2565XV18 be used with a single-ended clock source?

No-the device requires true differential K/K clock inputs. The internal timing architecture relies on both rising edges for separate read/write port synchronization. Single-ended driving violates AC timing specifications and causes undefined behavior in burst alignment and echo clock generation.

What is the purpose of the QVLD signal?

QVLD (Q Valid) is an edge-aligned output that indicates when Q[35:0] data is valid relative to CQ/CQ transitions. It eliminates the need for fixed delay calibration in high-speed receivers-system logic can use QVLD as a strobe to capture Q[35:0] on its rising edge, ensuring robust setup/hold margins at 1266 MT/s.