Infineon Technologies CY7C1564XV18-366BZXC

Overview

CY7C1564XV18-366BZXC from Cypress Semiconductor is a 2M × 36, 72-Mbit QDR® II+ Xtreme SRAM with separate read/write ports, 2.5-cycle read latency, 366 MHz operation (900 Mbps DDR data rate), and HSTL I/Os supporting 1.5 V supply. It delivers concurrent burst transfers in high-bandwidth networking buffers and packet processors.

For engineers reviewing the CY7C1564XV18-366BZXC datasheet, CY7C1564XV18-366BZXC pinout, CY7C1564XV18-366BZXC application, or CY7C1564XV18-366BZXC equivalent, key selection criteria include dual-port timing independence, echo clock (CQ/CQ) synchronization for high-speed capture, DOFF-configurable latency mode, and 165-ball FBGA package compatibility with dense PCB layouts.

Technical Context

This SRAM implements QDR II+ Xtreme architecture with fully independent synchronous read and write ports sharing one multiplexed address bus. Address latching occurs on alternating rising edges of K and K clocks, enabling true concurrency without bus turnaround.

It integrates a PLL for precise data placement, supports programmable output impedance via ZQ calibration, and uses edge-aligned QVLD to indicate valid DDR output data synchronized to CQ/CQ. The DOFF pin selects between 2.5-cycle (PLL enabled) and 1-cycle (QDR-I mode) read latency.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body, RoHS-compliant, with 0.8 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS7C36256A-166BIN and MT47H64M16HR-37E, CY7C1564XV18-366BZXC provides guaranteed 2.5-cycle latency, zero-refresh operation, and native echo-clock timing - making it uniquely suited for jitter-critical, full-duplex packet and sample buffering where deterministic bandwidth is non-negotiable.

Availability

CY7C1564XV18-366BZXC is available at Aetrix Electronics and suitable for network packet buffering, high-speed test instrumentation, telecom baseband processing, and real-time video frame storage requiring stable component supply across multi-year production cycles.

Supply support for CY7C1564XV18-366BZXC 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-performance memory and programmable solutions for demanding embedded and communications systems, with focus on signal integrity, timing precision, and power efficiency.

CY7C1564XV18 belongs to the QDR® II+ Xtreme SRAM product line, engineered specifically for deterministic, low-latency, full-duplex data buffering in infrastructure-grade networking and test equipment where bus turnaround overhead must be eliminated.

FAQ

What is the function of the DOFF pin on CY7C1564XV18-366BZXC?

The DOFF pin controls internal PLL operation: when pulled HIGH, the device operates in QDR-II+ mode with 2.5-cycle read latency and up to 366 MHz clock rate; when pulled LOW, it reverts to QDR-I mode with 1-cycle latency and maximum 167 MHz operation. This allows hardware-selectable timing modes without firmware changes or external configuration registers.

How does the ZQ pin affect signal integrity in high-speed designs?

ZQ enables on-die output impedance calibration: connecting an external resistor (typically 50 Ω) between ZQ and ground tunes CQ, CQ, and Q[35:0] driver strength to match PCB trace impedance. This reduces reflections and improves eye diagram margins - critical for reliable 900 Mbps DDR signaling without adding series termination resistors.

Can CY7C1564XV18-366BZXC perform simultaneous read and write operations to the same memory location?

No - while read and write ports operate concurrently, the device enforces data coherency by ensuring that a read access returns the most recently written data. Internal arbitration prevents conflicting access to the same address during overlapping cycles, guaranteeing consistent output even under full-duplex load without external lock logic.

What is the purpose of the QVLD signal, and how is it timed relative to CQ and Q[35:0]?

QVLD is asserted synchronously with the first valid 36-bit word on Q[35:0], edge-aligned to the rising edge of CQ (for read port). It eliminates the need for fixed delay compensation or eye-centering algorithms at the receiver - designers can use QVLD directly as a latch-enable signal for downstream capture registers, reducing timing closure effort.