Infineon Technologies CY7C1568KV18-550BZXC

Overview

CY7C1568KV18 from Cypress Semiconductor is a 72-Mbit (4M × 18) synchronous pipelined 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 used in high-bandwidth networking line cards requiring deterministic low-latency memory access.

For engineers reviewing the CY7C1568KV18 datasheet, CY7C1568KV18 pinout, CY7C1568KV18 application, or CY7C1568KV18 equivalent, this page delivers verified technical context, validated pin functions, real-world timing behavior under DDR II+ and DDR I modes, and direct alternatives with documented functional trade-offs.

Technical Context

The CY7C1568KV18 implements a synchronous pipelined SRAM core with dual-edge DDR II+ interface: address and control inputs are registered on K rising edges only, while write data is latched on both K and K rising edges, and read data is driven synchronously on both K and K rising edges. Its internal organization comprises two 2M × 18 arrays enabling concurrent burst access.

It supports configurable latency via DOFF pin: when asserted HIGH, it enables 2.5-cycle read latency with PLL-locked echo clocks (CQ/CQ); when LOW, it reverts to 1-cycle DDR I mode up to 167 MHz. Echo clocks are free-running, edge-aligned with K/K, and tightly track output data timing to eliminate system-level capture skew.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch BGA (13 mm × 15 mm × 1.4 mm), RoHS-compliant, with 0.8 mm ball pitch and standard JEDEC thermal pad layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed synchronous SRAM applications.

Compared with AS7C362000B-15TIN and IS61WV102418BLL-10BLI, the CY7C1568KV18 uniquely delivers 550 MHz DDR II+ operation with echo clocks and selectable latency - enabling higher throughput and simpler system timing closure in new designs, while retaining backward compatibility via DOFF pin.

Availability

CY7C1568KV18 is available at Aetrix Electronics and suitable for telecom infrastructure, high-speed test equipment, industrial motion control, and network processor buffering requiring stable component supply and long-term lifecycle assurance.

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 applications.

The CY7C1568KV18 belongs to Cypress's QDR II+/DDR II+ SRAM product line, engineered specifically for deterministic, high-bandwidth buffering in packet-processing and real-time control systems where latency predictability and signal integrity are critical.

FAQ

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

The DOFF pin is an active-low PLL enable control. When tied HIGH (≥0.7×VDDQ), the internal PLL is active, enabling 2.5-cycle read latency and full DDR II+ operation at up to 550 MHz. When pulled LOW, the PLL is disabled and the device reverts to DDR I mode with 1-cycle latency and maximum 167 MHz frequency. This hardware-selectable mode allows one design to serve both legacy and high-performance applications.

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

CQ and CQ are free-running output clocks synchronized to K and K, respectively, and edge-aligned with valid DQ data and QVLD assertion. They eliminate the need for system logic to generate precise capture clocks - receivers use CQ/CQ directly to latch DQ[17:0], removing board trace length matching requirements and reducing timing closure effort by up to 300 ps margin.

Can CY7C1568KV18 operate with VDDQ = 1.5 V while maintaining 550 MHz performance?

Yes. The device supports VDDQ from 1.4 V to 1.8 V, and all AC specifications-including 550 MHz maximum frequency and 2.5-cycle latency-are guaranteed across this range per the datasheet's "Operating Range" table. At 1.5 V, HSTL-15-compatible signaling is achieved without derating, provided VDD remains at 1.8 V ± 0.1 V.

What is the role of the ZQ pin, and what happens if it is left unconnected?

ZQ is an impedance calibration input. It must be connected either to ground via an external precision resistor (RQ) to set output impedance to 0.2×RQ, or directly to VDDQ to enable minimum-impedance mode. Leaving ZQ floating or connecting it to GND without RQ violates Absolute Maximum Ratings and may cause output driver instability, signal integrity degradation, or premature device failure.