Cypress Semiconductor Corp CY7C1515KV18-333BZC

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 1.4–1.8 V I/O supply. It implements separate read/write ports with DDR interfaces (666 MHz data rate), four-word burst architecture, and echo clocks (CQ/CQ) for high-speed system timing alignment. Used in network packet buffers and high-throughput switch fabric memory subsystems.

For engineers reviewing the CY7C1515KV18 datasheet, CY7C1515KV18 pinout, CY7C1515KV18 application, or CY7C1515KV18 equivalent, key selection criteria include its 2M × 36 × 4-word burst depth, dual-clock DDR timing (K/K and C/C), DOFF-controlled 1.5-cycle vs. 1-cycle read latency, HSTL-compatible output drive, and JTAG 1149.1 test access support.

Technical Context

The CY7C1515KV18 employs true dual-port QDR II architecture: independent read and write ports share one multiplexed 19-bit address bus but use separate control clocks (K/K for input, C/C for output) and dedicated data paths (D[35:0] inputs, Q[35:0] outputs). Its internal 512K × 36 array is replicated across four banks to enable concurrent access.

It integrates a PLL for precise data placement, supports programmable impedance via ZQ pin, and uses synchronous self-timed writes with byte write select (BWS[3:0]) enabling partial 36-bit word updates without read-modify-write. Echo clocks CQ/CQ align with output data edges to simplify capture at the controller.

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 delivers higher bandwidth (666 vs. 600/332 MT/s), integrated signal integrity features (ZQ, CQ), and true concurrency - making it optimal for next-gen networking and test equipment demanding deterministic latency and scalable memory bandwidth.

Availability

CY7C1515KV18 is available at Aetrix Electronics and suitable for network packet buffering, switch fabric memory, and telecom line card buffering requiring stable component supply across long-lifecycle deployments.

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) designs high-performance memory and programmable solutions for networking, automotive, and industrial applications.

The QDR II SRAM product line targets high-speed packet processing systems requiring deterministic latency, concurrent access, and DDR bandwidth - specifically engineered for switch fabric, router line cards, and test instrumentation.

FAQ

What is the function of the DOFF pin on CY7C1515KV18?

The DOFF (Data Output OFF) pin selects read latency mode: when asserted HIGH, it configures 1.5-cycle latency for improved setup/hold timing margins; when LOW, it enables 1-cycle latency for minimal access delay. This setting is sampled synchronously on the rising edge of the K clock and affects all subsequent read operations until changed.

How does the CY7C1515KV18 handle partial writes to a 36-bit word?

Partial writes are controlled by the four active-low byte write select signals BWS[3:0], each enabling one 9-bit segment of the 36-bit D[35:0] bus. When a BWS signal is deasserted, the corresponding 9-bit byte remains unaltered in memory - eliminating need for read-modify-write cycles and preserving data integrity in multi-threaded access scenarios.

Can CY7C1515KV18 operate with only a single clock domain?

Yes - the device supports single-clock mode where K and C are tied together (and K and C likewise), simplifying system clocking. In this mode, data is latched and driven on the same clock edges, though maximum frequency is reduced versus dual-clock operation due to timing constraints on combined clock path routing and skew.

What is the purpose of the ZQ pin on CY7C1515KV18?

The ZQ pin connects to an external 240 Ω precision resistor to ground, enabling on-die impedance calibration of HSTL output drivers. This calibrates output drive strength and termination to match PCB trace impedance, reducing reflections and improving signal integrity at 666 MT/s data rates without requiring discrete termination resistors.