Infineon Technologies CY7C2564XV18-450BZXC

Overview

CY7C2564XV18 from Cypress Semiconductor is a 2M × 36, 72-Mbit QDR® II+ Xtreme SRAM with separate read/write ports, 450 MHz clock operation (900 Mbps DDR data rate), 2.5-cycle read latency when DOFF = HIGH, and on-die termination (ODT) for D[35:0], BWS[3:0], and K/K inputs-designed for high-bandwidth packet buffering in network line cards.

For engineers reviewing the CY7C2564XV18 datasheet, CY7C2564XV18 pinout, CY7C2564XV18 application, or CY7C2564XV18 equivalent, key selection criteria include burst depth (two 36-bit words per access), HSTL I/O compatibility (VDDQ = 1.4–1.6 V), echo clock support (CQ/CQ) for timing margining, and JTAG 1149.1 test access for production validation.

Technical Context

This SRAM implements QDR II+ architecture with fully independent synchronous read and write ports sharing a multiplexed 20-bit address bus. Each port uses dedicated DDR interfaces synchronized to complementary K/K clocks, enabling concurrent read and write operations without bus turnaround.

The device integrates a PLL for precise data placement, supports programmable ODT via ZQ calibration and ODT pin logic level, and delivers valid output data aligned with echo clocks CQ/CQ while asserting QVLD. Depth expansion is enabled via RPS/WPS controls and byte-write select (BWS[3:0]) granularity.

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, 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 IDT72T36120L10BG and IS61WV102432BLL-15BLI, CY7C2564XV18 provides 2× memory density, 35% higher bandwidth, integrated ODT for cleaner signal integrity, and echo clocks for robust high-speed capture - making it uniquely suited for new 450 MHz synchronous designs.

Availability

CY7C2564XV18 is available at Aetrix Electronics and suitable for network line cards, high-speed test instrumentation, telecom baseband units, and broadcast video systems requiring stable component supply across multi-year production cycles.

Supply support for CY7C2564XV18 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 connectivity solutions for industrial, automotive, and communications markets.

CY7C2564XV18 belongs to the QDR® II+ Xtreme SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth buffering in packet-switched and real-time signal processing systems.

FAQ

What is the function of the DOFF pin on CY7C2564XV18?

The DOFF (Data Output OFF) pin configures read latency mode: when asserted HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency; when LOW or tied to VSS, it reverts to QDR I mode with 1-cycle latency. This pin is sampled at power-up and remains static during operation - no runtime switching is supported.

How does on-die termination (ODT) work on CY7C2564XV18?

ODT is enabled via the ODT pin and calibrated using an external 240 Ω resistor on the ZQ pin. A LOW on ODT selects RQ/3.33 (~72 Ω), while HIGH selects RQ/1.66 (~144 Ω). ODT applies only to D[35:0], BWS[3:0], and K/K inputs - not outputs - and is active after power-up initialization completes.

Can CY7C2564XV18 be used with a single-ended clock source?

No - the device requires differential K/K clock inputs. Driving K with a clock signal and tying K to a fixed logic level violates timing specifications and disables proper DDR operation. A dedicated differential clock generator or transformer is required to meet setup/hold requirements for both edges.

What is the purpose of the QVLD signal?

QVLD is a synchronous output that asserts one cycle before valid data appears on Q[35:0], aligned to the rising edge of CQ/CQ. It indicates that the current burst word is ready for sampling - critical for FPGA-based receivers implementing dynamic deskew or adaptive sampling windows in high-speed interfaces.