Infineon Technologies CY7C1565KV18-500BZXI

Overview

CY7C1565KV18-500BZXI 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 CY7C1565KV18-500BZXI datasheet, CY7C1565KV18-500BZXI pinout, CY7C1565KV18-500BZXI application, or CY7C1565KV18-500BZXI 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 CY7C1565KV18-500BZXI implements a true dual-port synchronous SRAM architecture with physically independent read and write data paths-no bus turnaround required. It uses two input clocks (K and K) for DDR timing control, with all synchronous inputs latched on rising edges and outputs edge-aligned to K/K and echo clocks CQ/CQ.

Its internal 512K × 36 × 4 array structure supports full data coherency across concurrent transactions. The PLL enables precise data placement for 2.5-cycle latency operation when DOFF = HIGH; disabling the PLL via DOFF = LOW reverts behavior to QDR I mode (1-cycle latency, ≤167 MHz).

Key Specifications

Pinout & Package

Package: 165-ball fine-pitch BGA (13 mm × 15 mm × 1.4 mm), RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C36256P-500BIN and IS42S32800J-5BL, the CY7C1565KV18-500BZXI uniquely delivers guaranteed 2.5-cycle latency with PLL control, echo-clock–assisted capture, and true dual-port concurrency-making it irreplaceable in QDR II+-compliant switch fabric and telecom infrastructure designs.

Availability

CY7C1565KV18-500BZXI 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 obsolescence management.

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

The CY7C1565KV18 belongs to Cypress's QDR® II+ SRAM product line, engineered specifically for ultra-low-latency, high-bandwidth buffering in networking and telecommunications infrastructure where deterministic timing and concurrent access are mandatory.

FAQ

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

The DOFF pin controls the internal PLL: when pulled HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency and full 500 MHz capability; when pulled LOW, the PLL is disabled and the device reverts to QDR I timing with 1-cycle latency and reduced maximum frequency (≤167 MHz). This pin must not be left floating and should use a ≤10 kΩ pull-up for normal operation.

How does the ZQ pin affect signal integrity?

The ZQ pin connects to an external resistor to ground to calibrate the output driver impedance of Q[35:0], CQ, and CQ signals to 0.2 × RQ. This matches the SRAM's output impedance to the PCB trace impedance (typically 50 Ω), minimizing reflections and ensuring clean eye diagrams at 500 MHz DDR. Connecting ZQ directly to VDDQ enables minimum-drive mode but forfeits calibration accuracy.

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

No. The device requires both K and K differential clock inputs for proper DDR operation: K clocks write-side inputs (D[35:0], WPS, BWS[3:0]), while K clocks read-side inputs (A, RPS) and drives Q[35:0] outputs. Both clocks must be present and phase-aligned; using only one clock violates timing specifications and prevents valid data transfer on either port.

What is the role of QVLD in system timing design?

QVLD is a synchronous output that asserts coincident with the first valid 36-bit word on Q[35:0] during a read burst. It eliminates reliance on fixed clock-cycle delays for data capture-allowing receivers to sample data only when QVLD is active. This accommodates process/voltage/temperature variation and simplifies timing closure in high-speed FPGA or ASIC interfaces.