Cypress Semiconductor Corp CY7C1568KV18-500BZC

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 co-processor 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 latency mode (2.5-cycle vs. 1-cycle), and HSTL-compatible drive strength matching.

Technical Context

This SRAM implements a pipelined synchronous architecture where all address, control, and data transfers are edge-triggered on rising edges of complementary clocks K and K. Read data bursts two 18-bit words per access, latched on alternating K/K edges, with output timing aligned to echo clocks CQ/CQ and validated by QVLD.

The device integrates a phase-locked loop (PLL) for accurate internal clock synthesis and data strobe alignment, supports programmable output impedance via ZQ calibration, and allows dynamic latency reconfiguration via DOFF pin - HIGH enables 2.5-cycle DDR II+ mode (up to 550 MHz), LOW reverts to 1-cycle DDR I mode (≤167 MHz).

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, with 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10PA and IS61WV102418BLL-10BLI, CY7C1568KV18 uniquely delivers DDR II+ burst bandwidth with user-selectable latency and integrated echo-clock timing - critical for FPGA- and ASIC-based systems demanding both speed and interface simplicity.

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 traceable sourcing.

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 embedded systems, emphasizing signal integrity, timing precision, and industrial reliability.

The CY7C1568KV18 belongs to Cypress's DDR II+ SRAM product line, engineered specifically for deterministic, high-bandwidth memory interfacing in FPGA, ASIC, and network processor platforms where echo-clock synchronization and latency configurability are essential.

FAQ

What is the function of the DOFF pin on CY7C1568KV18?

The DOFF pin is an active-LOW input that disables the internal PLL. When asserted LOW, the device operates in DDR I mode with 1-cycle read latency and maximum frequency of 167 MHz. When HIGH, it enables DDR II+ mode with 2.5-cycle latency and up to 550 MHz operation. Pull-up to VDDQ via ≤10 kΩ resistor is required for normal DDR II+ use.

How do CQ and CQ echo clocks improve system timing margin?

CQ and CQ are free-running, K-synchronized output clocks that track the same skew and jitter as the DQ[17:0] data outputs. By using CQ/CQ as capture clocks in the receiving logic (e.g., FPGA IDELAY/ISERDES), board-level trace skew and clock-to-data skew are inherently canceled, eliminating manual delay tuning and improving timing closure at >500 MHz.

Can CY7C1568KV18 operate with VDDQ = 1.5 V?

Yes. The device supports VDDQ from 1.4 V to 1.8 V, explicitly including 1.5 V operation. HSTL Class I input thresholds and variable-drive output buffers are designed to maintain signal integrity across this range. No configuration change is needed - simply supply VDDQ = 1.5 V and ensure ZQ calibration resistor is correctly sized.

What is the role of the ZQ pin and how should it be connected?

ZQ is an input used for output driver impedance calibration. It must be connected to a precision resistor (RQ) tied to ground; typical RQ = 240 Ω yields 48 Ω output impedance. Alternatively, connecting ZQ directly to VDDQ enables minimum-impedance mode. ZQ must never be left floating or tied to GND, as this disables calibration and risks signal integrity failure.