Cypress Semiconductor Corp CY7C1264XV18-450BZXC

Overview

CY7C1264XV18 from Infineon Technologies (formerly Cypress) is a 1 M × 36, 36-Mbit QDR® II+ Xtreme SRAM with dual independent read/write ports, 450 MHz clock operation (900 Mbps DDR data rate), 2.5-cycle read latency, and HSTL I/Os supporting 1.5 V supply. It delivers concurrent high-bandwidth memory access for network packet buffering in 10G/40G line cards.

For engineers reviewing the CY7C1264XV18 datasheet, CY7C1264XV18 pinout, CY7C1264XV18 application, or CY7C1264XV18 equivalent, key selection criteria include its 2.5-cycle latency mode, echo-clock–assisted timing closure, DOFF-configurable PLL bypass, and x36 burst interface for deterministic throughput in telecom control-plane buffers.

Technical Context

This SRAM implements QDR II+ Xtreme architecture with physically separate read and write data paths-eliminating bus turnaround overhead. Its dual DDR interfaces operate on rising edges of complementary K/K clocks, enabling full-duplex 900 Mbps transfers per port at 450 MHz.

The integrated PLL ensures precise data placement relative to echo clocks CQ/CQ, while DOFF pin allows dynamic switching between 2.5-cycle (PLL enabled) and 1-cycle (PLL disabled, QDR-I mode) latency-supporting both high-speed and legacy timing compliance within one footprint.

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 finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C33618B-450BIN and IS61WV102436BLL-450TQI, CY7C1264XV18 uniquely combines PLL-based timing precision, echo-clock support, ZQ impedance tuning, and DOFF-switchable latency - making it the only option qualified for 450 MHz operation in 1.5 V HSTL-18 telecom infrastructure with strict jitter and skew requirements.

Availability

CY7C1264XV18 is available at Aetrix Electronics and suitable for 10G/40G Ethernet line cards, network processor buffers, telecom control-plane memory, and high-speed test equipment requiring stable component supply across extended product lifecycles.

Supply support for CY7C1264XV18 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 maintains full product continuity, technical support, and long-term supply commitment for the QDR SRAM portfolio.

This device belongs to the QDR® II+ Xtreme SRAM product line, engineered specifically for deterministic, high-bandwidth memory access in telecom infrastructure, network processors, and test instrumentation where bus turnaround overhead and timing uncertainty must be eliminated.

FAQ

What is the function of the DOFF pin on CY7C1264XV18?

The DOFF (PLL Turn Off) pin is an active-low control that disables the internal PLL. When asserted LOW, the device operates in QDR-I mode with 1-cycle read latency and maximum frequency reduced to 167 MHz. This provides backward compatibility with legacy timing constraints while retaining the same pinout and basic functionality.

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 pins to 0.2 × RQ. This matches the SRAM's output impedance to the PCB trace impedance, minimizing reflections and improving eye diagram margins-especially critical at 450 MHz DDR operation.

Can CY7C1264XV18 be used in depth-expanded configurations?

Yes. The device supports depth expansion using RPS and WPS signals to enable independent read/write port selection across multiple devices. Each chip responds only when its respective port select is asserted, allowing seamless extension of memory depth without external logic or address decoding complexity.

What is the role of CQ and CQ echo clocks?

CQ and CQ are free-running, phase-aligned copies of the K and K input clocks, respectively. They are provided to simplify high-speed data capture by giving the receiving logic a locally synchronized clock reference-reducing skew sensitivity and eliminating the need for complex deskew circuitry in FPGA or ASIC interfaces.