Cypress Semiconductor Corp CY7C25652KV18-500BZI

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), on-die termination (ODT), and HSTL I/O interfaces. It delivers concurrent read/write throughput for high-speed packet buffering in network switches and routers.

For engineers reviewing the CY7C25652KV18 datasheet, CY7C25652KV18 pinout, CY7C25652KV18 application, or CY7C25652KV18 equivalent, key selection criteria include burst depth (4-word), ODT support for D[35:0]/BWS[3:0]/K/K, echo clock timing (CQ/CQ), QVLD validity signaling, and 165-ball FBGA (13 × 15 × 1.4 mm) package compatibility.

Technical Context

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

It uses a PLL for precise data placement and supports dual VDDQ (1.4–1.8 V) with HSTL-18/15-compatible drivers. The DOFF pin selects between 2.5-cycle (HIGH) and 1-cycle (LOW) read latency modes, maintaining functional alignment with legacy QDR I systems.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36150 and IS61WV102432BLL, CY7C25652KV18 uniquely combines 550 MHz DDR operation, ODT, echo clocks, and QVLD in a single 165-ball FBGA - delivering superior signal integrity, timing margin, and system-level integration for high-end networking and test equipment.

Availability

CY7C25652KV18 is available at Aetrix Electronics and suitable for network packet buffering, high-speed test equipment memory, telecom baseband processing, and FPGA co-processing buffer applications 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, concurrent-access memory subsystems in infrastructure-grade networking and test equipment.

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 for maximum bandwidth; when LOW, it reverts to 1-cycle latency compatible with QDR I timing. This pin is sampled at power-up and remains static during operation - it cannot be toggled dynamically during normal use.

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

ODT applies programmable termination resistance to D[35:0], BWS[3:0], K, and K inputs using an internal resistor network calibrated via the ZQ pin. ODT range (low/high) is selected by the ODT pin voltage, and values scale with the external ZQ resistor (175–350 Ω). No external resistors are needed, reducing PCB layer count and improving signal integrity at 550 MHz.

Can CY7C25652KV18 operate with 1.5 V I/O supply?

Yes - VDDQ supports 1.4 V to 1.8 V, explicitly including 1.5 V operation. The device uses HSTL-compatible output drivers that meet HSTL Class I specifications at 1.5 V, and input thresholds are designed for robust recognition of 1.5 V logic levels without level shifters or voltage translation.

What is the role of CQ and CQ echo clocks?

CQ and CQ are free-running, phase-aligned output copies of the K and K input clocks. They provide a local timing reference at the memory output pins, allowing receivers to latch Q[35:0] data with minimal skew. Unlike source-synchronous clocks in other protocols, CQ/CQ are not delayed or adjusted - their fixed relationship to QVLD and data edges simplifies high-speed capture in FPGA-based systems.