Infineon Technologies CY7C1565XV18-633BZXC

Overview

CY7C1565XV18 from Infineon Technologies (formerly Cypress) is a 2M × 36, 72-Mbit QDR® II+ Xtreme SRAM with separate read/write ports, 633 MHz clock support, 2.5-cycle read latency, DDR interfaces on both ports (1266 MT/s effective), and HSTL I/O compatible with 1.5 V supply. It serves as high-bandwidth buffer memory in network packet processors and telecom line cards requiring concurrent access and deterministic timing.

For engineers reviewing the CY7C1565XV18 datasheet, CY7C1565XV18 pinout, CY7C1565XV18 application, or CY7C1565XV18 equivalent, key selection criteria include its 2.5-cycle latency mode, DOFF-controlled PLL bypass, echo clock (CQ/CQ) timing alignment, and 165-ball FBGA package compatibility with high-speed PCB layout constraints.

Technical Context

The device implements a synchronous pipelined architecture with independent read and write ports sharing a multiplexed address bus. Address latching occurs on alternating rising edges of K and K clocks, enabling four-word burst transfers per access without bus turnaround.

It integrates a phase-locked loop (PLL) for precise data placement and supports two operational modes: QDR II+ mode (2.5-cycle latency, up to 633 MHz) when DOFF is HIGH, and QDR I mode (1-cycle latency, ≤167 MHz) when DOFF is LOW. Echo clocks CQ and CQ are free-running and synchronized to K/K for simplified high-speed data capture.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-bandwidth dual-port SRAM applications.

Compared with IDT72T36150 and IS61WV102436B, CY7C1565XV18 delivers 26% higher bandwidth and hardware-supported latency flexibility via DOFF, making it uniquely suited for next-generation packet processing where timing predictability and interface simplification are critical.

Availability

CY7C1565XV18 is available at Aetrix Electronics and suitable for network packet processing, telecom line cards, baseband processing, and high-frequency trading systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for CY7C1565XV18 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

Infineon Technologies acquired Cypress Semiconductor in 2020 and now owns and supports the full QDR® SRAM portfolio, including legacy Cypress designs like the CY7C1565XV18.

This device belongs to Infineon's QDR® II+ Xtreme SRAM product line, engineered specifically for deterministic, high-throughput memory interfacing in networking, telecom, and high-performance computing infrastructure.

FAQ

What is the function of the DOFF pin?

The DOFF (PLL Turn Off) pin is an active-low control that disables the internal phase-locked loop. When pulled LOW, the device reverts to QDR I timing mode with 1-cycle read latency and maximum operating frequency of 167 MHz. In normal operation, DOFF must be pulled HIGH via ≤10 kΩ resistor to enable QDR II+ mode at up to 633 MHz.

How does the ZQ pin affect signal integrity?

The ZQ pin connects to an external resistor to ground (typically 240 Ω) to calibrate the output driver impedance of Q[35:0], CQ, and CQ pins to 0.2 × RQ (≈48 Ω). This ensures consistent HSTL-compatible termination across process/voltage/temperature, minimizing reflections and improving timing margin on high-speed traces.

Can CY7C1565XV18 operate with only one clock input?

No. The device requires both K and K clock inputs. Although they are single-ended (not true differential), both signals are essential: K captures address, control, and write data; K captures read data and controls read output timing. Omitting either clock violates the timing architecture and prevents functional operation.

What is the role of QVLD in system timing?

QVLD is an edge-aligned valid-data strobe synchronized to CQ and CQ. It asserts one cycle before valid data appears on Q[35:0], indicating precisely when output data meets setup/hold requirements at the receiving device. This eliminates need for fixed delay assumptions and enables robust source-synchronous capture in FPGA or ASIC receivers.