Cypress Semiconductor Corp CY7C2665KV18-550BZXI

Overview

CY7C2665KV18 from Infineon Technologies (formerly Cypress) is a 4M × 36, 144-Mbit QDR® II+ SRAM with quad data rate architecture, 550 MHz clock frequency, 2.5-cycle read latency, and on-die termination (ODT). It features separate read/write ports, DDR interfaces on both ports (1100 MT/s effective data rate), and operates at 1.8 V core / 1.4–1.8 V I/O supply. Used in high-bandwidth networking line cards for packet buffering and header processing.

For engineers reviewing the CY7C2665KV18 datasheet, CY7C2665KV18 pinout, CY7C2665KV18 application, or CY7C2665KV18 equivalent, key selection criteria include burst depth (four-word), ODT support for D[35:0]/BWS[3:0]/K/K inputs, echo clock timing (CQ/CQ), QVLD validity signaling, and FBGA-165 package compatibility with high-speed PCB routing constraints.

Technical Context

The CY7C2665KV18 implements a synchronous pipelined SRAM architecture with independent read and write ports sharing a multiplexed 20-bit address bus. Read and write operations are latched on alternate rising edges of complementary K/K clocks, enabling concurrent access without bus turnaround.

It integrates a PLL for precise data placement, supports DOFF pin to switch between 2.5-cycle (QDR II+) and 1-cycle (QDR I-compatible) read latency modes, and uses HSTL I/O with variable-drive output buffers. ODT impedance is selected via the ODT pin and calibrated against an external ZQ resistor.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 15 mm × 17 mm × 1.4 mm body height, RoHS-compliant Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C331624PFS-55BIN and MT47H64M16HR-37E:H, the CY7C2665KV18 uniquely delivers guaranteed 2.5-cycle latency, hardware ODT, echo clocks, and true independent read/write ports - essential for deterministic high-throughput systems where timing predictability is non-negotiable.

Availability

CY7C2665KV18 is available at Aetrix Electronics and suitable for high-speed network switching, telecom line cards, ATE waveform capture, and low-latency financial trading systems requiring stable component supply across multi-year production cycles.

Supply support for CY7C2665KV18 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

Infineon Technologies acquired Cypress Semiconductor in 2020 and maintains its high-performance memory portfolio, including QDR SRAMs, with global manufacturing, quality, and support infrastructure.

This device belongs to the QDR® II+ SRAM product line, engineered specifically for deterministic, high-bandwidth memory interfacing in ASIC- and FPGA-based communications infrastructure where bus turnaround latency and signal integrity are critical.

FAQ

What is the function of the DOFF pin on CY7C2665KV18?

The DOFF (Data-Off) pin selects the read latency mode: when asserted high, it enables QDR II+ operation with 2.5-cycle read latency; when low, it reverts to QDR I-compatible 1-cycle latency. This pin is sampled during power-up initialization and remains static during operation - it does not support dynamic switching.

How does on-die termination (ODT) work on this SRAM?

ODT applies programmable termination resistance to D[35:0], BWS[3:0], and K/K inputs using internal switched resistors calibrated against the ZQ pin's external reference resistor. The ODT pin selects between two ranges: high (RQ/1.66) or low (RQ/3.33), with floating defaulting to high range - eliminating need for 16+ discrete terminators.

Can CY7C2665KV18 be used with a 1.5 V VDDQ supply?

Yes - the device supports VDDQ from 1.4 V to 1.8 V, explicitly including 1.5 V. At 1.5 V, HSTL output drive strength is reduced versus 1.8 V, but all AC timing specifications (including 550 MHz max clock) remain valid per datasheet Table 1, provided VDDQ stability and noise margins are maintained.

What is the role of CQ and CQ echo clocks?

CQ and CQ are free-running, edge-aligned copies of the K and K input clocks, respectively. They are output-synchronized to simplify timing closure in receiving FPGAs/ASICs - allowing data capture using echo clocks instead of K/K, which avoids skew between clock and data paths in high-speed layouts.