Infineon Technologies CY7C1565KV18-400BZXI

Overview

CY7C1565KV18-400BZXI from Cypress Semiconductor is a 72-Mbit QDR® II+ SRAM with 2M × 36 organization, 400 MHz maximum clock frequency, 2.5-cycle read latency (DOFF = HIGH), and 165-ball FBGA (13 × 15 × 1.4 mm) package. It features separate read/write ports, DDR interfaces on both ports, echo clocks (CQ/CQ), and QVLD data-valid indicator - deployed in high-bandwidth packet buffering for network line cards and telecom switching fabric.

For engineers reviewing the CY7C1565KV18-400BZXI datasheet, CY7C1565KV18-400BZXI pinout, CY7C1565KV18-400BZXI application, or CY7C1565KV18-400BZXI equivalent, key selection criteria include burst depth (four 36-bit words), VDDQ support range (1.4 V to 1.8 V), PLL-enabled timing alignment, HSTL I/O compatibility, and JTAG 1149.1 test access capability.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed 19-bit address bus. All inputs (A, D[35:0], RPS, WPS, BWS[3:0]) are registered on rising edges of K/K clocks; all outputs (Q[35:0], QVLD, CQ/CQ) are edge-aligned to K/K with output registers. The internal 512K × 36 × 4 array enables full data coherency and concurrent read/write transactions without bus turnaround.

Operation mode is determined by DOFF: HIGH enables QDR II+ mode (2.5-cycle latency, up to 400 MHz), LOW forces QDR I mode (1-cycle latency, ≤167 MHz). A PLL synchronizes internal timing for precise data placement, while ZQ pin calibrates output impedance to match system bus (0.2 × RQ or min-impedance mode).

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, Pb-free compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1565KV18-400BZXI, the -550BZXI delivers 37.5% higher bandwidth but increases power and layout complexity; the AS7C362000B-400BIN sacrifices deterministic timing and concurrency for lower cost and simpler interface - making it unsuitable for QDR-dependent systems.

Availability

CY7C1565KV18-400BZXI is available at Aetrix Electronics and suitable for network packet buffering, telecom switch fabric, and high-speed test equipment requiring stable component supply, long-lifecycle support, and guaranteed Pb-free compliance.

Supply support for CY7C1565KV18-400BZXI 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 focus on signal integrity and timing-critical systems.

The CY7C1565KV18 belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for deterministic, high-bandwidth memory access in packet-switched infrastructure where bus turnaround and latency variability must be eliminated.

FAQ

What is the function of the DOFF pin, and how does it affect timing?

The DOFF pin disables the internal PLL when driven LOW, forcing the device into QDR I mode with 1-cycle read latency and reduced maximum frequency (≤167 MHz). In normal QDR II+ operation (DOFF = HIGH), the PLL enables precise 2.5-cycle latency and 400 MHz operation. This dual-mode capability supports flexible initialization sequences and fallback timing margins during system bring-up.

How does the ZQ pin calibrate output impedance, and what external component is required?

ZQ connects to an external resistor (RQ) tied to ground; the device measures RQ and configures its CQ, CQ, and Q[35:0] output drivers to 0.2 × RQ. A typical RQ value is 50 Ω, yielding 10 Ω driver impedance. Alternatively, tying ZQ to VDDQ enables minimum-impedance mode. ZQ must never be left floating or connected to GND.

Can CY7C1565KV18-400BZXI support depth expansion, and how is it implemented?

Yes - depth expansion is achieved using RPS and WPS pins as port-select enables. Multiple devices can share the same address and data buses; asserting RPS/WPS on only one device per transaction isolates its read/write port. This allows stacking devices to increase total memory depth while preserving burst concurrency and timing alignment across the bank.

What is the role of QVLD, and why is it critical in high-speed systems?

QVLD is an active-HIGH output pulse edge-aligned to CQ/CQ that asserts exactly when Q[35:0] carries valid data from the current burst. In FPGA-based receivers, QVLD replaces complex clock-domain crossing logic by providing a deterministic, jitter-immune strobe - reducing timing uncertainty and eliminating metastability risk in >400 MHz DDR capture paths.