Cypress Semiconductor Corp CY7C1565KV18-450BZXI

Overview

CY7C1565KV18-450BZXI from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, four-word burst architecture, and 2.5-cycle read latency at 450 MHz. It features separate read/write ports, DDR interfaces on both ports (effective 900 Mbps per port), 1.8 V core supply, and 1.4–1.8 V I/O supply. Used in high-bandwidth packet buffering for network switches and routers.

For engineers reviewing the CY7C1565KV18-450BZXI datasheet, CY7C1565KV18-450BZXI pinout, CY7C1565KV18-450BZXI application, or CY7C1565KV18-450BZXI equivalent, key selection criteria include burst depth, dual-port concurrency, echo clock timing support, DOFF-configurable latency mode, and FBGA-165 package compatibility with high-speed PCB layout constraints.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write data paths, eliminating bus turnaround. It uses two input clocks (K and K) - both rising edges drive register sampling - and provides echo clocks (CQ/CQ) aligned to output data for precise capture in source-synchronous systems.

Internal operation relies on a PLL for accurate data placement and supports two latency modes: 2.5-cycle (DOFF = HIGH) for QDR II+ compliance at up to 550 MHz, or 1-cycle (DOFF = LOW) for QDR I compatibility at lower frequencies. Depth expansion is enabled via RPS/WPS and BWS[3:0] controls across multiple devices.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, lead-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 IDT72T36150L10BG and IS61WV102436B, CY7C1565KV18-450BZXI delivers double the density and 32× higher bandwidth via its QDR II+ architecture, while DOFF pin enables field-selectable latency modes - critical for mixed-speed system integration.

Availability

CY7C1565KV18-450BZXI is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, and high-speed test equipment requiring stable component supply and long-term industrial availability.

Supply support for CY7C1565KV18-450BZXI 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.

CY7C1565KV18 belongs to the QDR® II+ SRAM product line, engineered specifically for deterministic, low-latency, high-throughput buffering in packet-switched infrastructure where concurrent read/write bandwidth is non-negotiable.

FAQ

What is the function of the DOFF pin on CY7C1565KV18-450BZXI?

The DOFF pin controls the internal PLL: when asserted HIGH, it enables QDR II+ mode with 2.5-cycle read latency and supports up to 550 MHz operation; when LOW, it disables the PLL and reverts the device to QDR I mode with 1-cycle latency and reduced max frequency (≤167 MHz). This allows hardware-selectable timing behavior without changing firmware or controller logic.

How does the ZQ pin affect signal integrity in high-speed designs?

ZQ connects to an external resistor (typically 240 Ω) to ground to calibrate output driver impedance for Q[35:0], CQ, and CQ pins. This achieves ~50 Ω termination matching to PCB traces, minimizing reflections and ensuring clean eye diagrams at 450 MHz. Leaving ZQ unconnected or tied to GND violates specification and causes undefined drive strength.

Can CY7C1565KV18-450BZXI operate with only one clock input?

No - the device requires both K and K differential clock inputs. All synchronous inputs (D[x], RPS, WPS, BWS[x]) and outputs (Q[x], CQ, CQ) are sampled or driven on the rising edge of each clock. Using only K violates timing specifications and prevents correct burst sequencing; K must be inverted and phase-matched to K in PCB layout.

What is the role of QVLD in system-level timing validation?

QVLD is a synchronous output that transitions edge-aligned with CQ/CQ to indicate when Q[35:0] carries valid burst data. It replaces complex setup/hold margin calculations at the receiver - designers use QVLD as a strobe to latch Q[x] in FPGA fabric, ensuring reliable capture even with ±100 ps clock-to-Q skew across the 36-bit bus.