Infineon Technologies CY7C1568XV18-600BZXC

Overview

CY7C1568XV18-600BZXC from Cypress Semiconductor is a 72-Mbit (4M × 18) DDR II+ Xtreme SRAM with synchronous pipelined architecture, 2.5-cycle read latency, 600 MHz clock operation, and HSTL I/O interface. It delivers 1200 MT/s data throughput via double-data-rate transfers on rising edges of complementary K/K clocks, and is used in high-bandwidth networking buffers, packet processing ASIC/FPGA interfaces, and telecom line-card memory subsystems.

For engineers reviewing the CY7C1568XV18-600BZXC datasheet, CY7C1568XV18-600BZXC pinout, CY7C1568XV18-600BZXC application, or CY7C1568XV18-600BZXC equivalent, key selection criteria include DDR II+ burst timing compliance, echo-clock–synchronized data capture, QVLD-driven valid-data handshaking, and 1.8 V core / 1.5 V I/O supply compatibility.

Technical Context

This SRAM implements a two-word burst architecture where each address access retrieves two sequential 18-bit words on alternating K and K rising edges. Internal PLL ensures precise data placement relative to echo clocks CQ/CQ, enabling deterministic setup/hold margins at 600 MHz.

All synchronous inputs (A, R/W, LD, BWS[1:0], DOFF) are registered on K's rising edge; write data is latched on both K and K edges; read data is driven synchronously on both K and K edges with QVLD edge-aligned to CQ/CQ. ZQ pin enables dynamic output impedance tuning to match system bus termination.

Key Specifications

Pinout & Package

Delivered in a 165-ball fine-pitch ball grid array (FBGA) package measuring 13 mm × 15 mm × 1.4 mm, with 0.8 mm ball pitch and Pb-free finish. Pin assignments follow JEDEC MO-245AC standard layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C3256P-15TIN and IS61WV102416BLL-10MLI, CY7C1568XV18-600BZXC uniquely delivers deterministic 2.5-cycle DDR latency, echo-clock–synchronized data capture, and on-die impedance tuning - essential for 600 MHz packet-processing and real-time signal buffering where timing margin is constrained.

Availability

CY7C1568XV18-600BZXC is available at Aetrix Electronics and suitable for high-speed packet buffering, FPGA-based protocol acceleration, and telecom line card memory requiring stable component supply across extended production lifecycles.

Supply support for CY7C1568XV18-600BZXC 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 networking, automotive, and industrial applications, with emphasis on signal integrity and timing precision.

CY7C1568XV18 belongs to the DDR II+ Xtreme SRAM product line, engineered specifically for deterministic, low-latency burst memory interfacing in 10G+ data-path systems where echo-clock synchronization and QVLD handshaking replace static timing budgets.

FAQ

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

The DOFF pin is an active-low PLL disable control. When asserted LOW, it disables the internal PLL and forces the device into DDR I mode with 1-cycle read latency and maximum 167 MHz operation. When HIGH, the PLL is enabled, supporting 2.5-cycle latency and up to 600 MHz clocking. This pin allows hardware-selectable timing modes without changing firmware or layout.

How does the ZQ pin enable output impedance matching, and what external component is required?

ZQ connects to a 240 Ω resistor tied to ground, enabling the device to calibrate its HSTL output drivers to 48 Ω (0.2 × 240 Ω). This matches typical PCB trace impedance, minimizing reflections and improving signal integrity at 1200 MT/s. Direct connection to VDDQ enables minimum-impedance mode; floating or grounding ZQ is prohibited and may cause undefined behavior.

Why are CQ and CQ labeled as "echo clocks," and how do they simplify system design?

CQ and CQ are free-running output clocks synchronized to K and K, respectively, and edge-aligned with valid DQ data. They eliminate the need for external delay-locked loops or manual PCB trace length matching - receivers use CQ/CQ edges to sample DQ[17:0], removing skew sensitivity and enabling robust 600 MHz interface timing across temperature and voltage variations.

Can CY7C1568XV18-600BZXC support partial-word writes, and how is byte masking implemented?

Yes - BWS[1:0] pins provide active-low byte write select control. BWS0 masks DQ[8:0], BWS1 masks DQ[17:9]. Both are sampled on K and K rising edges during write cycles. Unmasked bytes are written; masked bytes retain prior contents. This enables efficient 8-bit or 9-bit updates without full-word read-modify-write sequences, reducing bus traffic and latency in packet header manipulation.