Infineon Technologies CY7C1264XV18-366BZXC

Overview

CY7C1264XV18-366BZXC from Infineon Technologies (formerly Cypress) is a 36-Mbit QDR® II+ Xtreme SRAM with 1 M × 36 organization, 2.5-cycle read latency, and dual DDR interfaces operating at 366 MHz (732 MT/s). It features separate read/write ports, echo clocks (CQ/CQ), QVLD data-valid indicator, and PLL-based timing alignment for high-speed packet buffering in networking ASICs and FPGA-based line cards.

For engineers reviewing the CY7C1264XV18-366BZXC datasheet, CY7C1264XV18-366BZXC pinout, CY7C1264XV18-366BZXC application, or CY7C1264XV18-366BZXC equivalent, key selection criteria include burst depth (2-word), I/O voltage range (1.4–1.6 V), HSTL-compatible interface, 165-ball FBGA package, and DOFF-controlled PLL enable/disable for QDR-I mode fallback.

Technical Context

This SRAM implements QDR II+ Xtreme architecture with fully independent read and write ports sharing a multiplexed address bus. Address latching occurs on alternating rising edges of K and K clocks, enabling concurrent access without bus turnaround. The internal PLL aligns output timing to echo clocks CQ/CQ for reliable data capture at 732 MT/s.

It supports byte-selectable writes via four BWS inputs (BWS0–BWS3), synchronous self-timed writes, and full data coherency. Core supply is 1.8 V ± 0.1 V; I/Os operate at 1.4–1.6 V with HSTL drivers and programmable impedance tuning via ZQ pin.

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 construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1264XV18-366BZXC, the -450BZXC offers higher bandwidth at the cost of stricter signal integrity requirements, while the AS7C33618B-366BIN trades HSTL precision and QVLD reliability for SSTL compatibility-making the original part optimal for new designs demanding robust high-speed interfacing.

Availability

CY7C1264XV18-366BZXC is available at Aetrix Electronics and suitable for high-speed packet buffering, network processor interfacing, FPGA-based protocol acceleration, and telecom baseband processing requiring stable component supply across extended production lifecycles.

Supply support for CY7C1264XV18-366BZXC 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 its high-performance memory portfolio, including QDR SRAMs, with global manufacturing, quality assurance, and long-term product support.

This device belongs to the QDR® II+ Xtreme SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth buffering in networking, telecommunications, and high-end computing systems where concurrent read/write throughput is critical.

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 operates in QDR-I mode with 1-cycle read latency and a maximum frequency of 167 MHz. For standard QDR-II+ operation at 366 MHz with 2.5-cycle latency, DOFF must be held HIGH via a ≤10 kΩ pull-up resistor to VDDQ.

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 matching minimizes reflections on high-speed traces, ensuring clean eye diagrams at 366 MHz. Leaving ZQ unconnected or tied to GND violates specification and risks signal degradation.

Can CY7C1264XV18-366BZXC be used with a 1.5 V I/O supply?

Yes. The device supports VDDQ from 1.4 V to 1.6 V, making 1.5 V a fully compliant and commonly used I/O supply voltage. At 1.5 V, HSTL-compatible output drive strength and input thresholds meet JEDEC HSTL Class I specifications, ensuring interoperability with FPGAs and ASICs designed for that voltage.

What is the role of QVLD in system timing?

QVLD is a synchronous, edge-aligned output that pulses HIGH during each valid data transfer on Q[35:0]. It is timed to coincide with the rising edges of CQ and CQ, providing a hardware-confirmed indication of data readiness. This eliminates reliance on fixed delay assumptions and allows receivers to latch data precisely without complex deskew logic.