Infineon Technologies CY7C1568KV18-450BZXC

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 450 MHz, HSTL I/O interface, and 1.8 V core / 1.4–1.8 V I/O supply. It delivers 1100 MT/s data throughput via double-data-rate transfers synchronized to K/K clocks and supports echo-clock–based data capture in high-speed memory subsystems for networking line cards and packet buffer applications.

For engineers reviewing the CY7C1568KV18 datasheet, CY7C1568KV18 pinout, CY7C1568KV18 application, or CY7C1568KV18 equivalent, key selection criteria include DDR II+ timing compliance, 165-ball FBGA package compatibility, QVLD-synchronized output validity, DOFF-configurable latency mode (2.5-cycle vs. 1-cycle), and JTAG 1149.1 test access support for production validation.

Technical Context

This SRAM implements a pipelined synchronous architecture where address and control signals are registered on the rising edge of K, while data is sampled on both K and K edges. Internal organization comprises two 2M × 18 arrays, enabling concurrent access management and depth expansion without wait states.

The device integrates a PLL for precise data placement relative to echo clocks CQ/CQ, supports programmable output impedance via ZQ calibration, and provides QVLD as an edge-aligned strobe indicating valid DQ[17:0] output. DOFF pin selection determines whether operation follows DDR II+ (2.5-cycle latency, up to 550 MHz) or legacy DDR I (1-cycle latency, ≤167 MHz) timing.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C362000B-15JIN and IS61WV102418BLL-10BLI, CY7C1568KV18 uniquely delivers DDR II+-optimized bandwidth, echo-clock–assisted data capture, and configurable latency - making it irreplaceable in systems demanding >1 GB/s sustained throughput with deterministic timing.

Availability

CY7C1568KV18 is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, depth-expanded memory subsystems, and real-time signal processing buffers requiring stable component supply across extended production lifecycles.

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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

CY7C1568KV18 belongs to Cypress's QDR II+/DDR II+ SRAM product line, engineered specifically for high-bandwidth, low-latency memory subsystems in networking, telecom, and test equipment where burst access and precise DDR timing are mandatory.

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 a 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 resistors ≤10 kΩ are recommended for normal DDR II+ use.

How does the ZQ pin affect output drive strength?

ZQ connects to an external resistor to ground to calibrate output driver impedance. The device sets CQ, CQ, and DQ output impedance to 0.2 × RQ, where RQ is the external resistor value. 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.

Can CY7C1568KV18 be used without the PLL enabled?

Yes - asserting DOFF LOW disables the PLL and reverts timing to DDR I specification: 1-cycle read latency, maximum 167 MHz clock rate, and simplified timing relationships. However, echo clocks CQ/CQ remain functional, and QVLD retains its edge alignment. This mode is intended for compatibility testing or low-frequency fallback, not full performance operation.

What is the purpose of the QVLD signal?

QVLD is a synchronous output that indicates when DQ[17:0] data is valid and stable. It is edge-aligned with CQ and CQ, asserting one clock cycle before the first valid data word appears on DQ. This eliminates guesswork in controller sampling logic and replaces traditional tAC/tOH timing margins with a deterministic strobe-driven capture window.