Cypress Semiconductor Corp CY7C1565KV18-500BZI

Overview

CY7C1565KV18-500BZI 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 500 MHz. It features separate read/write ports, DDR interfaces on both ports (1000 Mbps effective data rate), 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 CY7C1565KV18-500BZI datasheet, CY7C1565KV18-500BZI pinout, CY7C1565KV18-500BZI application, or CY7C1565KV18-500BZI equivalent, key selection criteria include concurrent read/write capability, echo clock timing support (CQ/CQ), QVLD data validity signaling, and PLL-controlled 2.5-cycle latency mode enabled by DOFF pin configuration.

Technical Context

The CY7C1565KV18-500BZI implements a true dual-port synchronous SRAM architecture with physically independent read and write data paths-no bus turnaround required. Its QDR II+ core uses two input clocks (K and K) to latch address/control on rising edges and drive DDR outputs synchronized to those same edges.

It integrates an internal PLL for precise data placement and supports two operational modes: 2.5-cycle latency (DOFF = HIGH) for 500 MHz operation, and 1-cycle latency (DOFF = LOW) emulating QDR I up to 167 MHz. Echo clocks CQ/CQ are free-running and edge-aligned to K/K, simplifying high-speed capture in FPGA-based systems.

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch ball grid array (FBGA), 13 mm × 15 mm × 1.4 mm body height, 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 IDT72T36115L10BG and IS61WV102436B, CY7C1565KV18-500BZI provides double the density, integrated timing control via PLL and echo clocks, and true hardware concurrency-making it uniquely suited for new high-speed packet processing architectures where latency predictability and bandwidth scalability are critical.

Availability

CY7C1565KV18-500BZI is available at Aetrix Electronics and suitable for network switches, telecom baseband units, and high-speed test equipment requiring stable component supply, long-lifecycle support, and Pb-free compliance.

Supply support for CY7C1565KV18-500BZI 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 programmable system-on-chip solutions for industrial, automotive, and communications markets.

The QDR® II+ SRAM product line was designed specifically for deterministic, low-latency, high-bandwidth buffering in packet-switched infrastructure-addressing the needs of 10G/25G/100G networking, radar signal processing, and real-time instrumentation.

FAQ

What is the function of the DOFF pin on CY7C1565KV18-500BZI?

The DOFF pin controls the internal PLL: when pulled HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency at up to 500 MHz; when pulled LOW, the PLL is disabled and the device reverts to QDR I timing with 1-cycle latency and reduced max frequency (167 MHz). This allows runtime mode selection without changing clock sources or firmware.

How does the QVLD signal improve system timing margin?

QVLD is edge-aligned with CQ and CQ echo clocks and asserts precisely when Q[35:0] data is valid. This eliminates the need for fixed delay calibration or worst-case timing budgeting in FPGA capture logic-enabling reliable 500-MHz DDR sampling using simple register-based capture triggered by QVLD rather than clock phase adjustment.

Can CY7C1565KV18-500BZI operate with only one clock input?

No. The device requires both K and K differential clock inputs for proper operation. All synchronous inputs (address, data, control) and outputs (Q[35:0], CQ, CQ) are referenced to the rising edges of both clocks. Using only one clock violates timing specifications and will result in undefined behavior or functional failure.

What is the purpose of the ZQ pin and how must it be connected?

ZQ enables output impedance calibration: connecting a 50-Ω resistor from ZQ to ground sets CQ, CQ, and Q[35:0] output drive strength to match 50-Ω transmission lines. Alternatively, tying ZQ to VDDQ enables minimum-impedance mode. ZQ must never be left floating or tied to GND directly-doing so disables calibration and risks signal integrity degradation.