Infineon Technologies CY7C2268KV18-550BZC

Overview

CY7C2268KV18 from Infineon Technologies (formerly Cypress) is a 36-Mbit DDR II+ synchronous SRAM with 2M × 18 organization, 550 MHz clock operation, 2.5-cycle read latency (DOFF = HIGH), on-die termination (ODT), and HSTL I/O interface - deployed in high-bandwidth networking line cards and packet buffer subsystems requiring deterministic burst data access.

For engineers reviewing the CY7C2268KV18 datasheet, CY7C2268KV18 pinout, CY7C2268KV18 application, or CY7C2268KV18 equivalent, key selection criteria include DDR II+ timing compliance, ODT configuration for D/BWS/K inputs, echo clock (CQ/CQ) synchronization, QVLD validity signaling, and FBGA-165 package thermal/mechanical constraints.

Technical Context

This device implements a pipelined burst architecture where addresses are latched on alternating rising edges of K and K clocks, and each read access delivers two consecutive 18-bit words synchronized to both K and K edges. Internal PLL ensures precise data placement relative to echo clocks CQ/CQ.

All synchronous inputs (R/W, LD, BWS[1:0], A[19:0]) are registered on the rising edge of K; write data is registered on both K and K edges; read data is driven on both K and K edges with QVLD edge-aligned to CQ/CQ. ODT supports programmable termination for D[17:0], BWS[1:0], and K/K inputs via ZQ resistor calibration.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR II+ SRAM applications.

Compared with AS7C362000B-550BIN and IS45S32800J-55BLI, CY7C2268KV18 uniquely delivers DDR II+ burst timing with integrated ODT, echo clocks, and QVLD - making it the sole option for deterministic, low-pin-count, high-reliability packet buffer designs in telecom and test equipment.

Availability

CY7C2268KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, high-speed test equipment memory, and defense radar signal processing requiring stable component supply across extended product lifecycles.

Supply support for CY7C2268KV18 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensor solutions, and memory technologies for industrial, automotive, and communications markets.

CY7C2268KV18 belongs to Infineon's legacy Cypress DDR II+ SRAM product line, engineered specifically for deterministic, high-bandwidth, low-latency data buffering in networking and telecom infrastructure where timing predictability outweighs density-per-dollar metrics.

FAQ

What is the function of the DOFF pin on CY7C2268KV18?

The DOFF (Double-Off) pin configures the device's read latency mode: when asserted HIGH, it enables DDR II+ operation with 2.5-cycle latency; when LOW, it reverts to DDR I timing with 1-cycle latency. This pin is sampled at power-up and remains static during operation - no dynamic switching is supported.

How does on-die termination (ODT) work on CY7C2268KV18?

ODT applies programmable termination resistors to D[17:0], BWS[1:0], and K/K inputs using an external ZQ resistor (175–350 Ω to ground). The ODT pin selects between two ranges: LOW enables RQ/3.33 (~53–105 Ω), HIGH enables RQ/1.66 (~105–210 Ω); floating defaults to HIGH range.

Can CY7C2268KV18 operate with VDDQ = 1.5 V while VDD = 1.8 V?

Yes - the device supports independent VDD (1.8 V ± 0.1 V) and VDDQ (1.4 V to 1.8 V), allowing 1.5 V I/O operation with 1.8 V core. This enables interoperability with 1.5 V HSTL-compatible FPGAs while maintaining full 550 MHz performance and ODT functionality.

What is the role of CQ and CQ echo clocks in system timing?

CQ and CQ are free-running, source-synchronous output clocks phase-aligned to K and K, respectively. They provide precise timing references for capturing Q[17:0] data - eliminating interconnect skew sensitivity and removing the need for board-level delay tuning or adjustable input delays in the receiving controller.