Infineon Technologies CY7C25652KV18-500BZC

Overview

CY7C25652KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 2.5-cycle read latency, 550 MHz clock operation (1100 MT/s DDR), and on-die termination (ODT) for D[35:0], BWS[3:0], and K/K inputs - deployed in high-bandwidth network packet buffers and FPGA co-processor memory interfaces.

For engineers reviewing the CY7C25652KV18 datasheet, CY7C25652KV18 pinout, CY7C25652KV18 application, or CY7C25652KV18 equivalent, key selection criteria include burst depth (four-word), echo clock timing (CQ/CQ), QVLD data validity signaling, HSTL I/O compatibility, and FBGA-165 package thermal/mechanical constraints.

Technical Context

The CY7C25652KV18 implements a synchronous pipelined architecture with physically separate read and write ports, enabling true concurrent read/write transactions without bus turnaround. Its four-word burst transfers 144 bits per access cycle, and internal self-timed writes eliminate external write-strobe coordination.

It uses dual input clocks (K and K) - both rising edges sampled for DDR data capture - and embeds a PLL to align CQ/CQ echo clocks with output data edges. ODT is configurable via ZQ resistor and ODT pin, supporting 175–350 Ω termination ranges for D[35:0], BWS[3:0], and clock inputs.

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, Pb-free option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615 and IS61WV102436B, CY7C25652KV18 delivers 10% higher bandwidth, eliminates 72 external terminations, and provides deterministic QVLD timing - making it optimal for new 10G+ infrastructure designs demanding signal integrity and layout efficiency.

Availability

CY7C25652KV18 is available at Aetrix Electronics and suitable for network packet buffering, FPGA co-processor caching, and telecom baseband processing requiring stable component supply across multi-year production cycles.

Supply support for CY7C25652KV18 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 programmable systems-on-chip for industrial, automotive, and communications markets.

The QDR® II+ SRAM product line was designed specifically for bandwidth-constrained, low-latency applications in networking ASICs, FPGA-based accelerators, and high-speed test instrumentation - prioritizing deterministic timing, concurrent access, and signal integrity at 550 MHz.

FAQ

What is the function of the DOFF pin on CY7C25652KV18?

The DOFF (Data Output OFF) pin configures read latency mode: when asserted HIGH, it enables 2.5-cycle read latency for maximum bandwidth; when LOW, it reverts to 1-cycle latency like QDR I devices. This pin is sampled at power-up and remains static during operation - it does not support dynamic switching.

How is on-die termination (ODT) configured for D[35:0] inputs?

ODT for D[35:0] is enabled by driving the ODT pin HIGH or LOW at power-up and connecting a precision resistor (175–350 Ω) between ZQ and GND. The ODT pin selects the scaling factor: LOW → RQ/3.33; HIGH → RQ/1.66. No register programming is required - configuration is hardware-only and latched at initialization.

Can CY7C25652KV18 operate with VDDQ = 1.4 V while maintaining 550 MHz performance?

Yes - the device supports VDDQ from 1.4 V to 1.8 V per datasheet specification (Document 001-66482 Rev. *I). At 1.4 V, AC timing parameters remain compliant up to 550 MHz, though core VDD must be maintained at 1.8 V ± 0.1 V. System-level validation is recommended for marginal voltage corners.

What is the purpose of the CQ and CQ echo clocks?

CQ and CQ are free-running, phase-aligned copies of K and K clocks, respectively, driven out synchronously with Q[35:0] data. They provide a dedicated, low-skew timing reference for capturing burst data in receiving logic (e.g., FPGA IDELAY/ISERDES), eliminating need for deskew circuitry and relaxing PCB trace length matching requirements.