Infineon Technologies CY7C1515KV18-333BZXC

Overview

CY7C1515KV18 from Cypress Semiconductor is a 2M × 36, 72-Mbit QDR® II SRAM with four-word burst architecture, 333 MHz clock operation (666 MHz DDR data rate), separate read/write ports, and 1.8 V core / 1.4–1.8 V I/O supply - deployed in high-bandwidth packet buffering for network line cards and switch fabric interfaces.

For engineers reviewing the CY7C1515KV18 datasheet, CY7C1515KV18 pinout, CY7C1515KV18 application, or CY7C1515KV18 equivalent, key selection criteria include concurrent read/write capability, echo clock (CQ/CQ) support for timing margin recovery, DOFF-controlled 1.5-cycle vs. 1-cycle read latency, and FBGA-165 package compatibility with high-speed PCB layout constraints.

Technical Context

This QDR II SRAM implements fully independent synchronous read and write ports sharing a multiplexed 19-bit address bus, with all transactions latched on rising edges of K/K clocks. It uses internal self-timed writes and supports depth expansion via RPS/WPS controls and four byte write selects (BWS[3:0]).

The device integrates a PLL for precise data placement, echo clocks (CQ/CQ) for source-synchronous data capture, and programmable HSTL output drivers. Read latency is configurable via DOFF pin: 1.5 cycles (DOFF = HIGH) or 1 cycle (DOFF = LOW), enabling trade-offs between throughput and timing closure in FPGA- or ASIC-based memory controllers.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, with 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C36256A-333BIN and IS45S32800J-333BLI, CY7C1515KV18 uniquely delivers DOFF-selectable latency, integrated echo clocks for timing margin recovery, and full JTAG testability - critical for high-reliability telecom and test equipment designs.

Availability

CY7C1515KV18 is available at Aetrix Electronics and suitable for packet buffering in network switches, high-speed test instrumentation, and telecom baseband processing requiring stable component supply across extended production lifecycles.

Supply support for CY7C1515KV18 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.

CY7C1515KV18 belongs to Cypress's QDR II SRAM product line, engineered specifically for deterministic, low-latency, high-throughput memory interfacing in networking and test equipment where concurrent read/write bandwidth and timing precision are critical.

FAQ

What is the function of the DOFF pin on CY7C1515KV18?

The DOFF (Data Output OFF) pin configures read latency: when asserted HIGH, it enables 1.5-cycle latency for higher sustained bandwidth; when LOW, it selects 1-cycle latency for minimal access delay. This setting directly affects timing budget allocation in the memory controller and must be held stable during operation - it is not dynamically switchable mid-burst.

How does the CY7C1515KV18 handle byte-level writes?

It uses four active-low byte write select signals (BWS[3:0]), each enabling write to a specific 9-bit byte lane: BWS0 → D[8:0], BWS1 → D[17:9], BWS2 → D[26:18], BWS3 → D[35:27]. Unselected bytes retain prior contents, enabling partial-word updates without read-modify-write cycles - essential for protocol header manipulation in packet processing.

Can CY7C1515KV18 operate with only a single clock domain?

Yes - when C and C are tied together and driven by the same source as K and K, the device operates in single-clock mode. In this configuration, Q[35:0] data is clocked by K/K instead of C/C, simplifying clock distribution at the cost of reduced timing margin; echo clocks (CQ/CQ) remain functional for data capture alignment.

What is the purpose of the NC/144M and NC/288M pins?

These are no-connect pins not bonded to the die; they may be left floating or tied to any valid voltage level (VSS, VDD, or VDDQ) per board layout requirements. They serve as thermal or mechanical relief pads in the FBGA package and have no electrical function - their state does not affect device operation or timing behavior.