Cypress Semiconductor Corp CY7C1620KV18-333BZXI

Overview

CY7C1620KV18-333BZXI from Infineon Technologies (formerly Cypress) is a 144-Mbit DDR II synchronous SRAM configured as 4M × 36, operating at 333 MHz with double-data-rate I/O delivering 666 MT/s bandwidth. It features dual input clocks (K/K), echo clocks (CQ/CQ), programmable output impedance via ZQ, and supports 1.5-cycle read latency (DOFF = high) or 1-cycle latency (DOFF = low). It is used in high-speed networking line cards and packet buffering subsystems requiring deterministic low-latency memory access.

For engineers reviewing the CY7C1620KV18-333BZXI datasheet, CY7C1620KV18-333BZXI pinout, CY7C1620KV18-333BZXI application, or CY7C1620KV18-333BZXI equivalent, key selection criteria include DDR II burst timing compliance, HSTL-18 I/O compatibility, FBGA-165 package integration, and JTAG 1149.1 testability for production validation.

Technical Context

The device implements a synchronous pipelined architecture with two-word burst addressing, where A0 drives an internal 1-bit counter to generate sequential 36-bit word addresses. All address, control, and data inputs are registered on rising edges of K and K clocks, enabling precise setup/hold timing at 333 MHz.

Read data is driven synchronously on C and C clock edges (or K/K in single-clock mode), with echo clocks CQ/CQ phase-aligned to output data for simplified capture at the controller. The integrated PLL ensures accurate data placement, while ZQ calibration adjusts output driver impedance to match system trace impedance (typically 50 Ω).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C3256A-15JCIN and IS61WV102418BLL-10BLI, CY7C1620KV18-333BZXI uniquely delivers DDR II timing, echo-clock–assisted capture, and ZQ impedance tuning-enabling reliable 666 MT/s operation in systems where signal integrity and deterministic latency are non-negotiable.

Availability

CY7C1620KV18-333BZXI is available at Aetrix Electronics and suitable for telecom line card buffering, network packet switching, and baseband processing applications requiring stable component supply and long-term lifecycle support.

Supply support for CY7C1620KV18-333BZXI 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and memory solutions for industrial, automotive, and communications markets.

This device belongs to Infineon's high-performance DDR II SRAM product line, designed specifically for deterministic, low-jitter memory buffering in high-speed serial data infrastructure where timing predictability outweighs density-per-dollar metrics.

FAQ

What is the function of the DOFF pin on CY7C1620KV18-333BZXI?

The DOFF (Data Output OFFset) pin selects read latency mode: when asserted high, it enables DDR II operation with 1.5-cycle latency; when low, it reverts to DDR I–compatible 1-cycle latency. This allows backward compatibility with legacy controllers while supporting newer high-performance designs that benefit from tighter burst alignment.

Can CY7C1620KV18-333BZXI operate without external C and C clocks?

Yes - the device supports single-clock mode using only K and K for both input registration and output timing. In this mode, CQ and CQ are generated relative to K/K instead of C/C, and data is driven on K/K edges. However, echo-clock–assisted capture and optimal deskewing require C/C inputs.

How does ZQ calibration affect signal integrity in high-speed layouts?

ZQ calibration dynamically adjusts the output driver impedance of DQ[35:0], CQ, and CQ to match the system's characteristic trace impedance (typically 50 Ω). This minimizes reflections and improves eye diagram margins, especially critical for maintaining clean 666 MT/s transitions across FR4 PCBs with length-matched routes.

Is CY7C1620KV18-333BZXI pin-compatible with CY7C1618KV18-333BZXI?

No - although both share the same 165-ball FBGA package and many signal names, CY7C1620KV18 uses DQ[35:0] and BWS[3:0], while CY7C1618 uses DQ[17:0] and BWS[1:0]. Pin assignments differ significantly in the data and byte-select regions; direct replacement requires PCB redesign and firmware adaptation.