Cypress Semiconductor Corp CY7C1525KV18-250BZXC

Overview

CY7C1525KV18-250BZXC from Cypress Semiconductor is an 8M × 9 (72-Mbit) QDR® II SRAM with synchronous pipelined architecture, dual independent read/write ports, 250 MHz K-clock operation (500 MT/s effective), 1.8 V core supply, and 1.4–1.8 V I/O supply. It delivers concurrent high-bandwidth memory access for network packet buffering in telecom line cards.

For engineers reviewing the CY7C1525KV18-250BZXC datasheet, CY7C1525KV18-250BZXC pinout, CY7C1525KV18-250BZXC application, or CY7C1525KV18-250BZXC equivalent, key selection criteria include burst depth (2-word), DDR timing compliance, echo clock (CQ) support for source-synchronous capture, and HSTL-18-compatible output drive.

Technical Context

This QDR II SRAM implements separate read and write data paths with fully independent address latching on alternating edges of the K clock, enabling true concurrent transactions without bus turnaround. Its internal PLL aligns CQ echo clocks to output data edges for reliable capture at 700 Mbps per port.

The device supports programmable DOFF mode for configurable read latency (1-cycle when LOW, 1.5-cycle when HIGH) and uses synchronous self-timed writes with byte-level write enables (BWS0). All I/Os comply with HSTL Class I specifications under 1.4–1.8 V VDDQ.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch, RoHS-compliant Pb-free finish (BZXC suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418BLL-10BLI, CY7C1525KV18-250BZXC uniquely delivers 72-Mbit density with true concurrent DDR ports, echo-clock timing, and QDR-II burst protocol-enabling higher throughput and simpler interface design in next-generation packet processing systems.

Availability

CY7C1525KV18-250BZXC is available at Aetrix Electronics and suitable for telecom infrastructure, network processor subsystems, and high-speed test equipment requiring stable component supply across extended product lifecycles.

Supply support for CY7C1525KV18-250BZXC 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) designs high-performance memory and programmable solutions for demanding embedded and communications applications.

The QDR® II SRAM product line targets high-bandwidth, low-latency memory subsystems in networking, test, and military/aerospace systems-emphasizing concurrent access, timing predictability, and signal integrity at multi-Gbps rates.

FAQ

What is the function of the DOFF pin on CY7C1525KV18-250BZXC?

The DOFF (Data Output OFFset) pin configures read latency mode: when asserted HIGH, it enables 1.5-cycle latency (standard QDR II operation); when LOW, it reduces latency to 1 cycle for QDR I compatibility. This setting directly affects the timing relationship between address assertion and first valid Q[8:0] output, and must be held stable during initialization.

How does the ZQ pin operate, and what external component is required?

The ZQ pin connects to a precision 240 Ω resistor to ground for on-die output driver impedance calibration. During ZQ calibration cycles (initiated via command or power-up), the device measures this reference to tune its HSTL output drivers to ±15% of target impedance, ensuring consistent signal integrity across voltage and temperature.

Can CY7C1525KV18-250BZXC operate with only one clock domain (K = C)?

Yes-the device supports single-clock-domain operation where K and C are tied together. In this mode, read data is clocked by the same edge that latches read addresses, simplifying board layout but reducing maximum achievable bandwidth compared to dual-clock (K/C separated) configuration with echo-clock capture.

What is the role of BWS0 in CY7C1525KV18-250BZXC, given its 9-bit data width?

BWS0 is the sole byte write select for the 9-bit interface; it operates as a global write enable for D[8:0]. Unlike x18/x36 variants with multiple BWS pins, CY7C1525KV18 uses BWS0 to gate the entire 9-bit word-either writing all bits or none-making it functionally equivalent to a standard write enable (WE#) for this configuration.