Infineon Technologies CY7C1568KV18-400BZXC

Overview

CY7C1568KV18 from Cypress Semiconductor is a 72-Mbit (4M × 18) DDR II+ synchronous SRAM with two-word burst architecture, 2.5-cycle read latency at 550 MHz, HSTL I/O interface, and integrated PLL for precise DDR timing. 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 data acquisition systems.

For engineers reviewing the CY7C1568KV18 datasheet, CY7C1568KV18 pinout, CY7C1568KV18 application, or CY7C1568KV18 equivalent, key selection criteria include DDR II+ burst timing compliance, echo clock (CQ/CQ) synchronization capability, QVLD data validity signaling, and DOFF-pin-selectable 1-cycle vs. 2.5-cycle latency modes.

Technical Context

This SRAM implements a synchronous pipelined architecture where all address, control, and data transfers are edge-triggered on rising edges of complementary clocks K and K. Read and write operations initiate on K's rising edge, while data is registered and driven on both K and K edges-enabling true double-data-rate throughput up to 1100 MT/s.

The device integrates an on-chip PLL for accurate data placement relative to echo clocks CQ/CQ, supports byte-write masking via BWS[1:0], and uses QVLD to indicate valid output data aligned with CQ/CQ edges. Its internal organization comprises two 2M × 18 arrays, enabling depth-expansion without wait states.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 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-speed synchronous SRAM applications.

Compared with AS7C362000B-15JIN and IS61WV102418BLL-10BLI, CY7C1568KV18 delivers 550 MHz DDR II+ operation with built-in echo clocks and QVLD-reducing external timing components and enabling deterministic sub-cycle data capture unattainable with QDR-II or async alternatives.

Availability

CY7C1568KV18 is available at Aetrix Electronics and suitable for network packet buffering, FPGA-based data acquisition, and telecom baseband processing requiring stable component supply, long-term lifecycle support, and guaranteed 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 demanding embedded and communications applications.

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 subsystems where timing predictability and signal integrity are critical.

FAQ

What is the function of the DOFF pin?

The DOFF pin controls the internal PLL: when asserted HIGH, the device operates in DDR II+ mode with 2.5-cycle read latency at up to 550 MHz; when pulled LOW, it disables the PLL and reverts to DDR I mode with 1-cycle latency and a maximum frequency of 167 MHz. This dual-mode capability supports both performance-critical and legacy-compatible system integration without hardware redesign.

How does the ZQ pin affect output drive strength?

The ZQ pin connects to an external resistor (RQ) tied to ground, enabling on-die calibration of CQ, CQ, and DQ output driver impedance to precisely 0.2 × RQ. This ensures consistent 25–35 Ω drive strength across voltage and temperature variations-critical for maintaining signal integrity on high-speed memory buses without discrete termination resistors.

Can CY7C1568KV18 be used in depth-expanded configurations?

Yes-the device supports seamless depth expansion using LD and R/W signals across multiple units. When one device completes a read, its outputs tristate automatically on the next K rising edge, allowing immediate access to the next device without wait states or external arbitration logic-enabling scalable memory capacity with fixed timing overhead.

What is the role of QVLD in system timing design?

QVLD is a synchronous, edge-aligned output that asserts HIGH only when DQ[17:0] carries valid read data-its timing is locked to CQ/CQ edges. System designers use QVLD as a direct latch-enable signal for downstream registers, eliminating setup/hold margin uncertainty and removing the need for manual clock-data phase adjustment in high-speed capture logic.