Cypress Semiconductor Corp CY7C1615KV18-300BZXI

Overview

CY7C1615KV18-300BZXI from Cypress Semiconductor is a 4 M × 36, 144-Mbit QDR® II SRAM with separate read/write ports, 300 MHz clock operation (600 MHz DDR data rate), 1.8 V core supply, and 1.4–1.8 V I/O supply. It delivers concurrent read/write transactions with four-word burst transfers and supports depth expansion via RPS/WPS controls in high-bandwidth networking buffers.

For engineers reviewing the CY7C1615KV18-300BZXI datasheet, CY7C1615KV18-300BZXI pinout, CY7C1615KV18-300BZXI application, or CY7C1615KV18-300BZXI equivalent, key selection criteria include its dual-clock DDR timing architecture, echo clock (CQ/CQ) support for high-speed data capture, DOFF-configurable 1-cycle vs. 1.5-cycle read latency, and 165-ball FBGA package compatibility with HSTL-18 interfaces.

Technical Context

The device implements true quad data rate (QDR® II) architecture with physically independent read and write ports-each with dedicated DDR I/O, separate address latching on K/K edges, and synchronous self-timed writes. It uses two input clocks (K/K) for address/data capture and two output clocks (C/C) plus echo clocks (CQ/CQ) to minimize skew across high-speed memory buses.

Internal organization comprises four 1 M × 36 arrays; address bus is multiplexed (A[19:0]), and byte write select (BWS[3:0]) enables granular 9-bit write masking. The PLL ensures precise data placement, while ZQ pin calibrates output impedance to match system trace impedance (0.2 × RQ).

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 15 mm × 17 mm × 1.4 mm body, 0.8 mm ball pitch, RoHS-compliant Pb-free finish (BZXI suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1615KV18-250BZXI and AS7C362000B-300BIN, the CY7C1615KV18-300BZXI uniquely combines 300 MHz operation, HSTL-18 compatibility, echo clock support, and DOFF-configurable latency - making it optimal for new high-speed designs demanding both bandwidth and timing flexibility.

Availability

CY7C1615KV18-300BZXI is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, and baseband processing cache applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY7C1615KV18-300BZXI 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.

The CY7C1615KV18 belongs to Cypress's QDR® II SRAM product line, designed specifically for high-bandwidth, low-latency buffering in networking switches, routers, and baseband processors where concurrent read/write and deterministic timing are mandatory.

FAQ

What is the function of the DOFF pin on CY7C1615KV18-300BZXI?

The DOFF (Data Output OFFset) pin configures read latency mode: when tied high, the device operates in QDR II mode with 1.5-cycle read latency; when tied low or to VSS, it reverts to QDR I mode with 1-cycle latency. This setting affects internal pipeline staging and must be fixed at power-up - it is not dynamically switchable during operation.

Can CY7C1615KV18-300BZXI operate with only a single clock input?

Yes - the device supports single-clock mode where K serves as both input and output clock (C = K, C = K). In this mode, echo clocks CQ/CQ are generated relative to K/K, and data is sampled/driven on K/K edges. However, dual-clock mode (separate K/K and C/C) is required to achieve full timing margin and deskew capability using CQ/CQ.

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

ZQ is an output impedance calibration reference. It must be connected to a precision resistor (RQ) to ground - typical value is 240 Ω - to set Q and CQ output impedance to 0.2 × RQ (e.g., 48 Ω). Direct connection to VDDQ enables minimum impedance mode (~25 Ω); connection to GND or leaving it floating violates specification and risks signal integrity failure.

How does depth expansion work with RPS and WPS signals?

RPS (Read Port Select) and WPS (Write Port Select) are active-low, synchronous controls that gate read and write operations independently. To expand memory depth, multiple CY7C1615KV18 devices share the same address and data buses while using unique RPS/WPS lines - enabling one device to read while another writes, or stacking devices for wider addressing without external multiplexers.