Infineon Technologies CY7C25632KV18-450BZXI

Overview

CY7C25632KV18 from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 4M × 18 organization, 450 MHz maximum operating frequency, 2.5-cycle read latency, and on-die termination (ODT) for D[17:0], BWS[1:0], and K/K inputs. It features separate read/write ports, DDR interfaces on both ports (2.2 Gbps effective data rate), and operates at 1.8 V core / 1.4–1.8 V I/O supply - deployed in high-bandwidth packet buffering for network line cards and switch fabric controllers.

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 thermal/mechanical constraints for high-speed PCB layout.

Technical Context

The CY7C25632KV18 implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed 20-bit address bus. Address latching occurs on alternating rising edges of K and K clocks, enabling concurrent access without bus turnaround.

It uses a PLL for precise data placement and supports two latency modes: 2.5-cycle read latency (DOFF = HIGH) and 1-cycle latency (DOFF = LOW). Echo clocks CQ and CQ are free-running, edge-aligned to K/K, and used for source-synchronous data capture in systems requiring sub-nanosecond timing margins.

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 option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418BLL-15BLI, the CY7C25632KV18 uniquely combines 72-Mbit density, 450 MHz DDR bandwidth, integrated ODT, and echo-clock timing - making it the sole fit for new designs targeting >1 GB/s sustained throughput with deterministic sub-10 ns latency.

Availability

CY7C25632KV18 is available at Aetrix Electronics and suitable for network packet buffering, switch fabric controller memory, telecom baseband processing, and high-frequency trading engine cache requiring stable component supply across multi-year production cycles.

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) designs high-performance memory and programmable solutions for networking, automotive, and industrial applications, with emphasis on signal integrity and timing precision.

The QDR® II+ SRAM product line targets high-speed infrastructure systems requiring deterministic latency, concurrent access, and simplified board design - specifically engineered for switch fabric, packet buffer, and baseband memory subsystems.

FAQ

What is the function of the DOFF pin on CY7C25632KV18?

The DOFF (Data-Off) pin configures read latency mode: when asserted HIGH, it enables 2.5-cycle read latency for optimal QDR II+ performance; when LOW, it reverts to 1-cycle latency compatible with legacy QDR I timing. 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 CY7C25632KV18?

ODT applies programmable termination resistance to D[17:0], BWS[1:0], and K/K inputs using an internal resistor network calibrated against the ZQ pin's external reference resistor. ODT range is selected by the ODT pin state (LOW = RQ/3.33; HIGH = RQ/1.66), eliminating need for 36 discrete 50 Ω resistors and reducing PCB routing complexity.

Can CY7C25632KV18 operate with only one clock input?

No - the device requires both K and K differential clock inputs. All synchronous inputs (D[17:0], BWS[1:0], RPS, WPS, A[19:0]) are sampled on rising edges of K or K, and all outputs (Q[17:0], CQ, CQ) are driven relative to these clocks. Using only K or only K violates timing specifications and causes functional failure.

What is the role of the QVLD signal in system timing?

QVLD is a synchronous, edge-aligned output that asserts coincident with the first valid word of a four-word read burst on Q[17:0]. It is timed to align with CQ/CQ edges, providing a reliable strobe for capturing Q[17:0] without additional setup/hold margin calculations - essential for timing closure in 450 MHz FPGA interfaces.