Infineon Technologies CY7C1650KV18-450BZC

Overview

CY7C1650KV18-450BZC from Cypress Semiconductor is a 144-Mbit QDR® II SRAM with 8 M × 18 organization, 333 MHz clock frequency, 1.8 V core supply, and 1.4–1.8 V I/O supply. It implements separate read/write ports with DDR interfaces on both, four-word burst architecture, and 1.5-cycle read latency (DOFF = high), targeting high-bandwidth packet buffering in network switches and routers.

For engineers reviewing the CY7C1650KV18-450BZC datasheet, CY7C1650KV18-450BZC pinout, CY7C1650KV18-450BZC application, or CY7C1650KV18-450BZC equivalent, key selection criteria include concurrent read/write capability, echo clock (CQ/CQ) support for timing margin recovery, HSTL-18 I/O compatibility, and 165-ball FBGA (15 × 17 × 1.4 mm) package constraints.

Technical Context

The device uses dual independent clock domains: K/K for address/data capture and C/C for output data timing, enabling precise DDR alignment without bus turnaround. Its internal PLL ensures accurate data placement relative to echo clocks CQ/CQ, critical for >666 MT/s system-level data capture.

It supports depth expansion via RPS/WPS and byte write control (BWS0/BWS1), allowing flexible memory subsystem scaling. The DOFF pin selects between QDR II mode (1.5-cycle latency) and QDR I–compatible mode (1-cycle latency), providing design flexibility across generations of controller IP.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar QDR II SRAM applications.

Compared with IDT72T3615L10PA and IS61WV102418BLL-10BLI, CY7C1650KV18-450BZC delivers 33% higher bandwidth, built-in echo clock timing recovery, and true concurrent read/write-making it uniquely suited for line-rate packet processing where deterministic latency and maximum throughput are mandatory.

Availability

CY7C1650KV18-450BZC is available at Aetrix Electronics and suitable for network switch fabric design, telecom line card development, and 5G baseband processing requiring stable component supply across multi-year production cycles.

Supply support for CY7C1650KV18-450BZC 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-critical applications.

This device belongs to Cypress's QDR® II SRAM product line, engineered specifically for high-throughput, low-latency buffering in packet-switched infrastructure where concurrent read/write and precise DDR timing are essential.

FAQ

What is the function of the DOFF pin on CY7C1650KV18-450BZC?

The DOFF (Double Output OFF) pin configures the device's read latency mode. When asserted high, it enables QDR II operation with 1.5-cycle read latency and full four-word burst capability. When tied low or to VSS, it reverts to QDR I–compatible mode with 1-cycle latency and reduced burst efficiency-allowing interoperability with legacy controllers designed for earlier QDR generations.

How does the ZQ pin affect signal integrity in high-speed designs?

The ZQ pin connects to an external precision resistor (typically 100 Ω) to ground, enabling on-die calibration of output driver impedance for Q[17:0] and CQ/CQ signals. This tunes output strength to match PCB trace impedance, minimizing reflections and improving eye diagram margins-critical for reliable 666 MT/s operation without external termination resistors.

Can CY7C1650KV18-450BZC operate with only one clock (K) instead of K/K and C/C pairs?

Yes-the device supports single-clock mode where K serves as both input and output clock. In this mode, C and C are unused, and Q[17:0] outputs are driven on K/K edges. However, echo clock functionality (CQ/CQ) and optimal deskew capability are lost, reducing timing margin in high-speed multi-device systems where flight time mismatches exist.

What is the role of BWS0 and BWS1 in byte write operations?

BWS0 and BWS1 are active-low byte write select signals controlling D[8:0] and D[17:9], respectively. When asserted, they enable writing to their associated 9-bit subwords; when deasserted, those bits retain prior content. This eliminates need for read-modify-write cycles during partial updates-reducing latency and bus contention in real-time control applications.