Infineon Technologies CY7C1568KV18-550BZXI

Overview

CY7C1568KV18 from Cypress Semiconductor is a 72-Mbit (4M × 18) synchronous DDR II+ SRAM with two-word burst architecture, 2.5-cycle read latency at 550 MHz, HSTL I/O interface, and integrated PLL for precise data placement. It operates with core VDD = 1.8 V ± 0.1 V and I/O VDDQ = 1.4–1.8 V, and is packaged in a 165-ball FBGA (13 × 15 × 1.4 mm). It serves as high-bandwidth buffer memory in network packet processors and FPGA-based acceleration subsystems.

For engineers reviewing the CY7C1568KV18 datasheet, CY7C1568KV18 pinout, CY7C1568KV18 application, or CY7C1568KV18 equivalent, key selection criteria include DDR II+ timing compliance, echo clock (CQ/CQ) synchronization capability, QVLD data validity signaling, DOFF-configurable 1-cycle vs. 2.5-cycle latency mode, and HSTL-18-compatible drive strength.

Technical Context

This SRAM implements a pipelined synchronous architecture where all address, control, and data transfers are edge-aligned to dual-phase clocks K and K. Read and write operations initiate on the rising edge of K, while data is registered on both K and K edges-enabling true double-data-rate operation at 1100 MT/s with 550 MHz input clock.

The device integrates an on-chip PLL for accurate output data alignment to echo clocks CQ/CQ, supports programmable output impedance via ZQ calibration, and provides QVLD to indicate valid output data timing relative to CQ/CQ edges. DOFF pin selection determines whether the device runs in DDR II+ (2.5-cycle latency, up to 550 MHz) or legacy DDR I (1-cycle latency, ≤167 MHz) mode.

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-speed synchronous SRAM applications.

Compared with IDT72T3615L10BG and IS61WV102418B, CY7C1568KV18 delivers 4× higher density and integrated timing infrastructure (PLL + CQ/CQ + QVLD), eliminating external timing components and enabling direct connection to high-speed ASIC/FPGA interfaces without layout-intensive skew management.

Availability

CY7C1568KV18 is available at Aetrix Electronics and suitable for network packet buffering, FPGA co-processor caching, and telecom baseband processing requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free manufacturing compliance.

Supply support for CY7C1568KV18 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 embedded and communications systems, with emphasis on signal integrity, timing precision, and automotive-grade reliability.

CY7C1568KV18 belongs to Cypress's QDR II+/DDR II+ SRAM product line, engineered specifically for applications needing deterministic burst-access latency, echo-clock–synchronized data capture, and seamless integration with high-speed ASIC and FPGA memory controllers.

FAQ

What is the function of the DOFF pin, and how does it affect timing behavior?

The DOFF pin controls internal PLL operation: when asserted HIGH, the PLL is active and the device operates in DDR II+ mode with 2.5-cycle read latency at up to 550 MHz; when pulled LOW, the PLL is disabled and the device reverts to DDR I timing with 1-cycle latency and maximum 167 MHz clock rate. This allows hardware-selectable performance modes without firmware changes.

How do CQ and CQ echo clocks simplify system-level data capture?

CQ and CQ are free-running output clocks synchronized to the input K/K clocks, with fixed phase relationship to DQ[17:0] transitions. They eliminate the need for external delay-locked loops or PCB trace-length matching because receivers can use CQ/CQ edges-rather than K/K-to sample data, ensuring zero-skew capture across all data bits in high-speed systems.

Can CY7C1568KV18 operate with VDDQ = 1.5 V, and what is the impact on signal integrity?

Yes-CY7C1568KV18 supports VDDQ from 1.4 V to 1.8 V, including 1.5 V. At 1.5 V, HSTL output drive strength scales proportionally, maintaining signal integrity within HSTL Class I specifications. The ZQ calibration pin ensures output impedance remains matched to the system bus regardless of VDDQ level, preserving termination accuracy.

What is the role of the QVLD signal, and how is it timed relative to CQ/CQ?

QVLD is a synchronous output that asserts high exactly on the same edge of CQ and CQ that drives valid data onto DQ[17:0]. It remains asserted for the duration of valid data (one full CQ/CQ period), providing unambiguous, clock-synchronized indication of the data validity window-critical for reliable latching in high-speed receivers without additional timing margin analysis.