Cypress Semiconductor Corp CY7C1565V18-400BZI

Overview

CY7C1565V18 from Cypress Semiconductor is a 72-Mbit QDR-II+ SRAM with 2M × 36 organization, 400 MHz clock operation, 2.5-cycle read latency, and DDR interfaces on independent read/write ports. It delivers 800 MT/s data transfer rate per port and supports burst-4 sequential access for high-bandwidth networking buffers and packet memory in telecom line cards.

For engineers reviewing the CY7C1565V18 datasheet, CY7C1565V18 pinout, CY7C1565V18 application, or CY7C1565V18 equivalent, key selection criteria include x36 bus width support, 165-ball FBGA (15 × 17 mm) package compatibility, HSTL I/O voltage range (VDDQ = 1.4V to 1.8V), and DLL-enabled precise timing alignment via CQ/CQ echo clocks.

Technical Context

This device implements QDR-II+ architecture with fully independent read and write ports sharing a single multiplexed address bus. Address latching occurs on alternating rising edges of K and K clocks, enabling concurrent access without bus turnaround.

It uses synchronous self-timed writes, JTAG 1149.1 test access, and a Delay Lock Loop (DLL) to align output data with echo clocks CQ/CQ. The ZQ pin enables impedance tuning of Q[35:0], CQ, and CQ outputs to match system trace impedance.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 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 high-bandwidth dual-port SRAM applications.

Compared with CY7C1563V18 and AS7C3256B-15JCIN, the CY7C1565V18 uniquely delivers native x36 width, 800 MT/s DDR throughput, and DLL-aligned echo clocks - eliminating inter-chip skew and enabling single-device 72-Mbit buffering at 400 MHz.

Availability

CY7C1565V18 is available at Aetrix Electronics and suitable for telecom infrastructure, network processor interfacing, wireless baseband processing, and high-speed test equipment requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1565V18 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 demanding communications and industrial applications.

The QDR-II+ SRAM product line targets ultra-low-latency, high-throughput memory subsystems in networking, telecom, and test equipment where deterministic timing and concurrent access are mandatory.

FAQ

What is the minimum VDDQ voltage supported by CY7C1565V18?

The device supports VDDQ from 1.4 V to 1.8 V, exceeding the QDR Consortium's 1.5 V ± 0.1 V specification. Operation at 1.4 V is validated and maintains full 400 MHz functionality with HSTL-compatible signaling margins.

How does the ZQ pin affect output impedance calibration?

ZQ connects to an external 240 Ω resistor to ground, calibrating internal output drivers to 48 Ω (0.2 × 240 Ω). This matches standard 50 Ω PCB traces, minimizing reflections and ensuring signal integrity at 800 MT/s data rates.

Can CY7C1565V18 operate without the DLL enabled?

Yes - pulling DOFF LOW disables the DLL and reverts the device to QDR-I timing mode, supporting up to 167 MHz operation. In this mode, CQ/CQ become simple buffered copies of K/K, and QVLD alignment shifts accordingly.

What is the function of BWS[3:0] in x36 configuration?

BWS[3:0] controls four independent 9-bit byte lanes: BWS0 → D[8:0], BWS1 → D[17:9], BWS2 → D[26:18], BWS3 → D[35:27]. Each active-low signal enables writing to its respective byte group while preserving others - essential for partial updates in packet headers.