Cypress Semiconductor Corp CY7C1515KV18-333BZXI

Overview

CY7C1515KV18 from Cypress Semiconductor is a 72-Mbit QDR® II SRAM with 2M × 36 organization, 333 MHz clock frequency, 1.8 V core supply, and 165-ball FBGA (13 × 15 × 1.4 mm) package. It implements separate read/write DDR ports, four-word burst architecture, and echo clocks (CQ/CQ) for high-speed data capture in networking and packet buffering systems.

For engineers reviewing the CY7C1515KV18 datasheet, CY7C1515KV18 pinout, CY7C1515KV18 application, or CY7C1515KV18 equivalent, key selection criteria include its 666 MHz effective data rate, DOFF-configurable 1.5-cycle vs. 1-cycle read latency, 36-bit wide synchronous interface, and support for depth expansion via RPS/WPS and BWS[3:0] controls.

Technical Context

This QDR II SRAM uses dual independent DDR interfaces: write data sampled on rising edges of K/K clocks, read data driven on rising edges of C/C clocks. Its internal 512K × 36 memory array is accessed via a shared 19-bit address bus latched on K-clock edges, enabling concurrent read/write transactions without bus turnaround.

The device integrates a PLL for precise data placement, supports programmable impedance via ZQ pin, and features JTAG 1149.1 boundary scan. Echo clocks (CQ/CQ) align with output data to simplify timing closure at 666 MHz, while DOFF pin selects between 1.5-cycle (HIGH) and 1-cycle (LOW) read latency modes.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615 and IS61WV102436B, CY7C1515KV18 uniquely balances 333 MHz operation with flexible latency (DOFF), echo-clock timing aid, and mature QDR II ecosystem support - making it optimal for field-deployed telecom and networking hardware requiring long-term supply stability.

Availability

CY7C1515KV18 is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, and telecom baseband processing requiring stable component supply over extended product 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.

The QDR II SRAM product line was engineered specifically for deterministic, low-latency, high-throughput memory access in networking infrastructure - addressing the need for concurrent read/write without bus contention in packet-forwarding ASICs and FPGAs.

FAQ

What is the function of the DOFF pin on CY7C1515KV18?

The DOFF (Data Output OFFset) pin configures read latency mode: when asserted HIGH, it enables 1.5-cycle read latency for improved timing margin in high-skew layouts; when LOW, it selects 1-cycle latency for maximum throughput. This setting is sampled synchronously on the K clock and affects all subsequent read operations until changed.

How does the CY7C1515KV18 handle byte-level writes?

Byte-level writes are controlled by four active-low BWS[3:0] inputs, each selecting an 8-bit segment of the 36-bit D[35:0] bus. When a BWS signal is deasserted, the corresponding byte remains unaltered in memory. All BWS signals are sampled on the same K/K clock edge as the write data, enabling atomic partial-word updates without read-modify-write cycles.

Can CY7C1515KV18 operate with only a single clock source?

Yes - the device supports single-clock-domain operation using only the K clock for both input capture and output driving (with C tied to K). In this mode, Q[35:0] data is driven on K's rising edge, and CQ echoes K. However, dual-clock operation (K/K for inputs, C/C for outputs) is required to achieve full 333 MHz performance and minimize skew in high-speed systems.

What is the purpose of the ZQ pin?

The ZQ pin connects to an external 240 Ω precision resistor to ground, enabling on-die termination impedance calibration. This adjusts HSTL output driver strength to match PCB trace impedance, reducing signal reflections and improving eye diagram integrity at 666 MHz DDR rates - critical for reliable operation in dense, high-speed memory subsystems.