Infineon Technologies CY7C1568KV18-500BZXI

Overview

CY7C1568KV18 from Cypress Semiconductor is a 72-Mbit (4M × 18) DDR II+ synchronous pipelined 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 V to 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, key selection considerations include DDR II+ burst timing alignment, echo clock (CQ/CQ)–driven data capture, QVLD-synchronized output validity, and DOFF-controlled latency mode switching between DDR I (1-cycle) and DDR II+ (2.5-cycle) operation.

Technical Context

The device implements a synchronous pipelined architecture where all address, control, and data transfers are edge-aligned to dual input clocks (K and K). Read and write operations initiate on the rising edge of K, with data latched on both K and K edges - enabling true double-data-rate throughput at 1100 MT/s while maintaining 550 MHz clock frequency.

Its internal organization comprises two 2M × 18 arrays, supporting two-word sequential bursts per access. The integrated PLL synchronizes echo clocks (CQ/CQ) to K, eliminating system-level skew compensation; QVLD provides edge-aligned validity indication referenced to CQ/CQ, and ZQ enables programmable output impedance matching to the data bus.

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 synchronous SRAM applications.

Compared with AS7C36256P-15JIN and IS61WV102418BLL-10BLI, CY7C1568KV18 delivers 2× bandwidth at same clock frequency via DDR, eliminates system-level skew tuning with CQ/CQ, and supports runtime latency adaptation - making it uniquely suited for new high-speed serial fabric designs.

Availability

CY7C1568KV18 is available at Aetrix Electronics and suitable for high-speed network line cards, telecom baseband processing, ATE pattern memory, and industrial real-time control buffers 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) 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 deterministic, low-jitter, high-throughput buffering in serial fabric and packet-processing systems where timing predictability outweighs cost-per-bit optimization.

FAQ

What is the function of the DOFF pin on CY7C1568KV18?

The DOFF (DLL/PLL Off) pin is an active-low control that disables the internal PLL. When asserted LOW, the device reverts to DDR I timing with 1-cycle read latency and maximum 167 MHz operation. When HIGH, it enables DDR II+ mode with 2.5-cycle latency and up to 550 MHz clock frequency. Pull-up resistor (≤10 kΩ to VDDQ) is required for normal DDR II+ operation.

How does the QVLD signal improve system timing margin?

QVLD is a synchronous output that asserts edge-aligned with the rising edges of CQ and CQ, indicating precisely when DQ[17:0] carries valid data. Unlike asynchronous ready signals, QVLD eliminates setup/hold uncertainty at the receiver, allowing direct connection to FPGA input registers without additional timing constraints or deskew logic.

Can CY7C1568KV18 operate with VDDQ = 1.5 V?

Yes. The device supports VDDQ from 1.4 V to VDD (1.8 V), explicitly including 1.5 V operation. HSTL Class I input thresholds and variable-drive output buffers are fully characterized across this range, ensuring reliable signaling in mixed-voltage systems where 1.5 V I/O standards coexist with 1.8 V core logic.

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

ZQ is an impedance calibration input tied to an external precision resistor (RQ) between ZQ and ground. The device uses this to tune its HSTL output drivers to 0.2 × RQ. For example, a 60 Ω resistor sets output impedance to 12 Ω. Alternatively, connecting ZQ directly to VDDQ enables minimum-impedance mode - but it must never be left floating or tied to GND.