Infineon Technologies CY7C1563XV18-633BZXC

Overview

CY7C1563XV18-633BZXC from Infineon Technologies (formerly Cypress) is a 72-Mbit QDR® II+ Xtreme SRAM with 4M × 18 organization, 633 MHz clock frequency, 2.5-cycle read latency, and dual DDR interfaces for concurrent read/write operations. It delivers 1266 MT/s data transfer on both ports and operates with 1.8 V core supply and 1.5 V I/O (VDDQ), targeting high-bandwidth packet buffering in network switches and routers.

For engineers reviewing the CY7C1563XV18-633BZXC datasheet, CY7C1563XV18-633BZXC pinout, CY7C1563XV18-633BZXC application, or CY7C1563XV18-633BZXC equivalent, key selection criteria include burst depth (four-word), echo clock timing (CQ/CQ), QVLD validity signaling, DOFF-configurable PLL mode, and HSTL-compatible 165-ball FBGA package.

Technical Context

This SRAM implements true dual-port synchronous architecture with physically separate read and write data paths-no bus turnaround required. Its QDR II+ Xtreme core uses two independent DDR interfaces synchronized to K and K clocks, each capturing data on rising edges only, enabling full-duplex operation at 633 MHz.

The device integrates a programmable PLL for precise data placement, echo clocks (CQ/CQ) aligned to output data for simplified capture, and a dedicated QVLD signal that edge-aligns with CQ to indicate valid output data. DOFF pin enables runtime switching between 2.5-cycle QDR II+ mode and 1-cycle QDR I mode (≤167 MHz).

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 synchronous SRAM applications.

Compared with CY7C1563XV18-553BZXC, the -633BZXC delivers +14.5 GB/s peak bandwidth and tighter setup/hold margins; versus AS7C3256A-15JCIN, it provides true dual-port concurrency, burst efficiency, and source-synchronous timing-enabling architectures impossible with asynchronous SRAM.

Availability

CY7C1563XV18-633BZXC is available at Aetrix Electronics and suitable for network packet buffering, high-speed test equipment memory, telecom baseband processing, and AI accelerator on-chip cache requiring stable component supply and long-term industrial availability.

Supply support for CY7C1563XV18-633BZXC 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and memory solutions for automotive, industrial, and communications markets.

CY7C1563XV18 belongs to Infineon's QDR® II+ Xtreme SRAM product line, engineered specifically for deterministic, ultra-high-bandwidth data buffering in next-generation networking and signal processing systems where latency predictability and concurrent access are non-negotiable.

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 asserted LOW, the device reverts to QDR I timing mode with 1-cycle read latency and a maximum operating frequency of 167 MHz. For normal QDR II+ operation at 633 MHz with 2.5-cycle latency, DOFF must be pulled HIGH via ≤10 kΩ resistor to VDDQ.

How does the ZQ pin affect signal integrity?

The ZQ pin calibrates the output driver impedance of Q[17:0], CQ, and CQ pins to match the system's data bus characteristic impedance. Connecting ZQ to a precision resistor (e.g., 240 Ω) to ground sets output impedance to 0.2 × RQ (e.g., 48 Ω). This minimizes signal reflections and ensures clean eye diagrams at 1266 MT/s, especially critical in multi-drop or long-trace layouts.

Can CY7C1563XV18-633BZXC perform simultaneous read and write to the same address?

No. While the device supports fully concurrent read and write operations to *different* addresses due to its dual-port architecture, writing to an address currently being read from results in undefined data on the read port. The memory array enforces address collision avoidance at the internal decode level-reads and writes to identical addresses are not permitted in the same cycle and must be sequenced with appropriate interlock logic in the controller.

What is the role of QVLD in system timing validation?

QVLD is a synchronous, edge-aligned output that pulses high exactly one cycle after the first valid data word appears on Q[17:0], and remains high for the duration of the four-word burst. It provides unambiguous, clock-domain-aligned confirmation of data validity-eliminating the need for complex timing margin analysis or static timing verification of Q[x] setup/hold at the receiver, especially under PVT variation.