Cypress Semiconductor Corp CY7C1515KV18-250BZXC

Overview

CY7C1515KV18 from Cypress Semiconductor is a 2M × 36, 72-Mbit QDR® II SRAM with four-word burst architecture, 250 MHz maximum operating frequency (40 ns clock period), 1.8 V core supply, and 1.4–1.8 V I/O supply. It features separate read/write ports, DDR interfaces on both ports (500 Mbps per data pin), echo clocks (CQ/CQ), and PLL-based timing control for high-bandwidth networking buffers in packet switching ASICs.

For engineers reviewing the CY7C1515KV18 datasheet, CY7C1515KV18 pinout, CY7C1515KV18 application, or CY7C1515KV18 equivalent, key selection criteria include 2M × 36 depth-width configuration, FBGA-165 package compatibility, DOFF-controlled read latency (1.5-cycle vs. 1-cycle), BWS[3:0] byte write granularity, and JTAG 1149.1 test access support.

Technical Context

The CY7C1515KV18 implements a synchronous pipelined QDR II architecture with independent read and write ports sharing a single multiplexed address bus (A[18:0]). Read and write operations are latched on alternate rising edges of the K clock, enabling concurrent transactions without bus turnaround.

It uses dual output clocks (C and C) with echo clocks (CQ and CQ) to compensate for PCB flight-time skew, and integrates a PLL for precise data placement. The device supports programmable impedance, HSTL-compatible output drivers, and synchronous self-timed writes with full data coherency across all four burst words.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, 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 CY7C1515KV18-250BZXC, the -200 variant trades 20% bandwidth for lower power and cost, while AS7C3256B requires complete redesign of timing control and data flow-neither offers functional equivalence without architectural changes.

Availability

CY7C1515KV18-250BZXC is available at Aetrix Electronics and suitable for packet-switching ASICs, telecom line cards, LTE baseband processors, and real-time video encoders requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1515KV18-250BZXC 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 memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

The QDR® II SRAM product line was designed specifically for high-bandwidth, low-latency buffering in networking and telecommunications infrastructure, emphasizing concurrent access, burst efficiency, and signal integrity at multi-Gbps rates.

FAQ

What is the function of the DOFF pin on CY7C1515KV18-250BZXC?

The DOFF (Data Output OFF) pin selects read latency mode: when asserted HIGH, it enables 1.5-cycle read latency (QDR II mode) for pipelined operation; when LOW, it configures 1-cycle latency (QDR I compatibility mode). This setting directly affects controller pipeline depth and must be fixed at power-up; it is not dynamically switchable during operation.

How does the BWS[3:0] signal operate in CY7C1515KV18-250BZXC?

BWS[3:0] are active-low byte write select signals controlling four independent 9-bit segments of the 36-bit D[35:0] bus. Each BWS bit enables writing to its corresponding byte group (e.g., BWS0 → D[8:0]); deselected bytes retain prior contents. All BWS signals are sampled synchronously with data on the rising edge of K/K, enabling partial writes without read-modify-write cycles.

Can CY7C1515KV18-250BZXC operate with only a single clock (K) instead of differential K/K?

Yes - the device supports single-clock-domain operation using only the K input clock for both address/data capture and output timing (C and C tied to K and K respectively). In this mode, echo clocks (CQ/CQ) remain functional for source-synchronous capture, but deskewing capability is reduced compared to true differential C/C usage.

What is the purpose of NC/144M and NC/288M pins in the FBGA-165 package?

NC/144M and NC/288M are no-connect pins not bonded to the die; they may be left floating or tied to any valid voltage level (e.g., VSS or VDDQ) for mechanical stability or thermal relief. These pins serve no electrical function and do not affect device operation, timing, or reliability - their presence accommodates die size variations across the QDR II family.