Infineon Technologies CY7C1663KV18-550BZXC

Overview

CY7C1663KV18 from Cypress Semiconductor is a 144-Mbit QDR® II+ SRAM with 8 M × 18 organization, 550-MHz clock support, 2.5-cycle read latency, and separate read/write DDR ports delivering 1100 MT/s data rate. It operates at 1.8-V core (VDD) and 1.4–1.8-V I/O (VDDQ), housed in a 165-ball FBGA (15 × 17 × 1.4 mm), and is used in high-bandwidth packet buffering for network line cards and switch fabric interfaces.

For engineers reviewing the CY7C1663KV18 datasheet, CY7C1663KV18 pinout, CY7C1663KV18 application, or CY7C1663KV18 equivalent, key selection criteria include its quad-data-rate burst architecture, echo-clock–assisted timing closure, JTAG 1149.1 testability, DOFF-configurable latency mode, and HSTL-compatible I/O drive strength.

Technical Context

The CY7C1663KV18 implements a synchronous pipelined QDR II+ architecture with physically independent read and write ports-each using DDR interfaces synchronized to complementary K/K clocks. Address inputs are multiplexed and latched on alternating rising edges of K/K, enabling concurrent read/write operations without bus turnaround.

It integrates an internal PLL for precise data placement, supports programmable output impedance via ZQ calibration, and uses echo clocks (CQ/CQ) aligned to output data for simplified high-speed capture. The DOFF pin selects between 2.5-cycle QDR II+ mode (DOFF = high) and 1-cycle QDR I mode (DOFF = low), altering both latency and maximum frequency.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 15 mm × 17 mm × 1.4 mm, RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-bandwidth dual-port SRAM applications.

Compared with IDT72T36120, CY7C1663KV18 offers wider VDDQ flexibility and on-die impedance tuning; compared with IS61WV102418B, it delivers >30× higher effective bandwidth and deterministic latency essential for real-time data-path buffering.

Availability

CY7C1663KV18 is available at Aetrix Electronics and suitable for network packet buffering, switch fabric interface, baseband processing memory, and high-speed test equipment data capture requiring stable component supply and long-term industrial availability.

Supply support for CY7C1663KV18 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 systems, with emphasis on signal integrity and timing precision.

The QDR II+ SRAM product line targets high-speed data-path applications demanding deterministic latency, concurrent access, and robust DDR timing-especially in telecom infrastructure and test instrumentation.

FAQ

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

The DOFF pin disables the internal PLL when asserted low, switching the device from QDR II+ mode (2.5-cycle latency, 550 MHz max) to QDR I mode (1-cycle latency, ≤167 MHz). In QDR I mode, timing parameters change significantly-setup/hold margins widen, but bandwidth drops by over 60%. This mode is intended for debug, timing margin validation, or legacy system compatibility-not production operation at rated speed.

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

The ZQ pin connects to a precision resistor (typically 100 Ω ±1%) tied to ground, enabling on-die calibration of CQ, CQ, and Q[17:0] output drivers to match system trace impedance. Calibration sets output impedance to 0.2 × RQ (e.g., 20 Ω for 100 Ω RQ). Direct connection to VDDQ enables minimum-impedance mode (≈15 Ω); floating or grounding ZQ is prohibited and may cause undefined behavior.

Can CY7C1663KV18 be used with a 1.5-V-only system, and what I/O voltage settings are supported?

Yes-CY7C1663KV18 supports VDDQ from 1.4 V to 1.8 V, making it compatible with both 1.5-V and 1.8-V HSTL systems. When VDDQ = 1.5 V, all HSTL Class I input thresholds and output drive levels remain compliant per JEDEC standards. No configuration register or strap is needed; voltage tolerance is inherent in the I/O cell design.

What is the role of CQ and CQ echo clocks, and how do they differ from K and K?

CQ and CQ are free-running, edge-aligned copies of K and K generated internally and output synchronously with Q[17:0]. Unlike K/K (which drive internal registers), CQ/CQ serve as source-synchronous strobes for capturing Q[17:0] at the receiver-reducing skew sensitivity and eliminating need for board-level delay tuning. Their phase relationship to Q[17:0] is guaranteed per AC specs (tQVQ, tQVQH).