Infineon Technologies CY7C25652KV18-500BZXC

Overview

CY7C25652KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 2.5-cycle read latency, and 550 MHz clock operation. It features separate read/write ports, DDR interfaces on both ports (1100 MHz data rate), on-die termination (ODT) for D[35:0]/BWS[3:0]/K/K inputs, and HSTL I/O supporting 1.4–1.8 V VDDQ. It is used in high-bandwidth networking line cards for packet buffering.

For engineers reviewing the CY7C25652KV18 datasheet, CY7C25652KV18 pinout, CY7C25652KV18 application, or CY7C25652KV18 equivalent, key selection criteria include 2.5-cycle read latency timing, ODT configuration via ZQ/ODT pins, echo clock (CQ/CQ) synchronization for data capture, and depth expansion support using RPS/WPS port selects.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed address bus. Address latching occurs on alternate rising edges of K and K clocks, enabling concurrent access without bus turnaround.

It uses a PLL to align echo clocks (CQ/CQ) with input clocks for precise DDR data capture, and integrates on-die termination controlled by ODT and ZQ pins to match system impedance-eliminating external resistors for D[35:0], BWS[3:0], and K/K inputs.

Key Specifications

Pinout & Package

Available in 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, with 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36120L10BG and IS61WV102432BLL-15BLI, CY7C25652KV18 uniquely delivers 2.5-cycle latency configurability, integrated ODT across 44 pins, and echo clocks for simplified high-speed capture-making it optimal for QDR II+ legacy upgrades and 100G+ infrastructure designs requiring deterministic timing and layout efficiency.

Availability

CY7C25652KV18 is available at Aetrix Electronics and suitable for high-speed packet switching, telecom line cards, network processor offload, and test equipment pattern memory requiring stable component supply and long-term lifecycle support.

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 connectivity solutions for industrial, automotive, and communications markets.

CY7C25652KV18 belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency, high-throughput buffering in networking and telecom infrastructure where concurrent read/write bandwidth and signal integrity are critical.

FAQ

What is the function of the DOFF pin on CY7C25652KV18?

The DOFF (Delay OFF) pin configures read latency mode: when asserted HIGH, it enables 2.5-cycle read latency (QDR II+ mode); when LOW, it reverts to 1-cycle latency (QDR I compatibility mode). This pin is sampled at power-up and remains static during operation-no runtime switching is supported.

How does on-die termination (ODT) work on CY7C25652KV18?

ODT is enabled via the ODT pin and calibrated using an external resistor on the ZQ pin. A LOW on ODT selects low-range termination (~175–350 Ω), while HIGH selects high-range (~175–250 Ω). The device applies matched termination to D[35:0], BWS[3:0], and K/K inputs-reducing stub reflections and eliminating 44 discrete resistors.

Can CY7C25652KV18 be used with a 1.5 V VDDQ supply?

Yes. The device supports VDDQ from 1.4 V to 1.8 V, including 1.5 V. At 1.5 V, HSTL Class I output drive strength is maintained, and AC timing parameters (e.g., tAC, tHZ) remain within spec per the datasheet's 1.5 V operating condition tables-enabling interoperability with 1.5 V FPGA I/O banks.

What is the purpose of CQ and CQ echo clocks?

CQ and CQ are free-running, phase-aligned copies of K and K clocks, respectively. They provide a source-synchronous timing reference at the receiver (e.g., FPGA input register), allowing precise data capture without requiring tight PCB trace length matching. QVLD is edge-aligned with CQ/CQ to indicate valid data windows.