Infineon Technologies CY7C25632KV18-400BZXI

Overview

CY7C25632KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 4M × 18 organization, 2.5-cycle read latency, 550 MHz clock support, and on-die termination (ODT) for D[17:0], BWS[1:0], and K/K inputs. It delivers 1100 MT/s DDR throughput on separate read/write ports and operates at 1.8 V core / 1.4–1.8 V I/O for high-speed networking buffer applications.

For engineers reviewing the CY7C25632KV18 datasheet, CY7C25632KV18 pinout, CY7C25632KV18 application, or CY7C25632KV18 equivalent, key selection criteria include burst depth (four-word), echo clock timing (CQ/CQ), QVLD validity signaling, HSTL I/O compatibility, and FBGA-165 package constraints in high-bandwidth memory subsystems.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed 20-bit address bus. Address latching occurs on alternate rising edges of K and K clocks, enabling concurrent access without bus turnaround.

It uses a PLL for precise data placement and supports dual-mode latency: 2.5 cycles when DOFF = HIGH (QDR II+ mode) or 1 cycle when DOFF = LOW (QDR I compatibility). ODT is configurable via ZQ resistor and ODT pin to match system impedance for D[17:0], BWS[1:0], and K/K.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T36120L10BG and IS61WV102418B, CY7C25632KV18 uniquely combines 72-Mbit density, 400 MHz DDR bandwidth, ODT, echo clocks, and QVLD in a 1.8 V FBGA package - making it optimal for new high-speed packet processing designs requiring signal integrity and timing determinism.

Availability

CY7C25632KV18 is available at Aetrix Electronics and suitable for high-speed network packet buffering, telecom line card data buffers, multi-core processor cache coherency directories, and test equipment pattern memory requiring stable component supply and long-term lifecycle assurance.

Supply support for CY7C25632KV18 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.

This device belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency, high-throughput memory interfacing in networking ASICs, FPGAs, and baseband processors where bus turnaround overhead must be eliminated.

FAQ

What is the function of the DOFF pin on CY7C25632KV18?

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

How does on-die termination (ODT) work on CY7C25632KV18?

ODT applies programmable termination resistance to D[17:0], BWS[1:0], and K/K inputs using an internal switched resistor network. The ODT pin selects between two ranges (RQ/3.33 or RQ/1.66), while ZQ connects to an external precision resistor to ground to calibrate output driver and ODT impedance to 0.2 × RQ - eliminating external resistors and improving signal integrity.

Can CY7C25632KV18 operate with VDDQ = 1.5 V while VDD = 1.8 V?

Yes. The datasheet explicitly states VDDQ supports 1.4 V to VDD (1.8 V), including 1.5 V operation. This allows interoperability with 1.5 V FPGA I/O banks while maintaining 1.8 V core logic stability - verified in DC electrical characteristics tables and supported across all speed grades including the -400BZXI variant.

What is the role of CQ and CQ echo clocks in system timing?

CQ and CQ are free-running, phase-aligned copies of K and K clocks, respectively. They provide a local, low-skew timing reference at the receiver to sample Q[17:0] data - decoupling data capture timing from board-level clock distribution skew and enabling robust setup/hold margin at 400 MHz clock rates without complex deskew circuitry.