Cypress Semiconductor Corp CY7C2563XV18-633BZXC

Overview

CY7C2563XV18-633BZXC from Cypress Semiconductor is a 72-Mbit QDR® II+ Xtreme SRAM with 4M × 18 organization, 633 MHz clock frequency, 2.5-cycle read latency (DOFF = HIGH), and on-die termination (ODT) for D[17:0], BWS[1:0], and K/K inputs. It delivers 1266 MT/s DDR data rates on separate read/write ports and operates at 1.8 V core / 1.5 V I/O supply in high-bandwidth networking buffers.

For engineers reviewing the CY7C2563XV18-633BZXC datasheet, CY7C2563XV18-633BZXC pinout, CY7C2563XV18-633BZXC application, or CY7C2563XV18-633BZXC equivalent, key selection criteria include concurrent read/write port independence, echo clock (CQ/CQ) timing support, QVLD data validity signaling, HSTL I/O compatibility, and FBGA-165 package integration for high-speed SerDes interface buffering.

Technical Context

This QDR II+ Xtreme SRAM implements a synchronous pipelined architecture with fully independent read and write ports, enabling true concurrent transactions without bus turnaround. Its four-word burst transfers 72 bits per access (18-bit × 4), latched on alternating rising edges of K and K clocks.

The device integrates a PLL for precise data placement, supports programmable ODT via ZQ calibration and ODT pin voltage selection (RQ/3.33 or RQ/1.66), and uses echo clocks CQ/CQ aligned to output data for simplified high-speed capture - all while maintaining full data coherency across ports.

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 and standard JEDEC MO-270AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102418B, CY7C2563XV18-633BZXC uniquely combines 72-Mbit density, 1266 MT/s DDR throughput, integrated ODT, and echo-clock–assisted timing - making it optimal for new high-speed packet-processing designs requiring minimal board-level timing margin.

Availability

CY7C2563XV18-633BZXC is available at Aetrix Electronics and suitable for high-speed network packet buffering, telecom line card data path management, multi-core processor cache coherency directory storage, and automated test equipment pattern memory requiring stable component supply and long-term industrial availability.

Supply support for CY7C2563XV18-633BZXC 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

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.

CY7C2563XV18 belongs to the QDR® II+ Xtreme SRAM product line, engineered specifically for deterministic, low-latency, full-duplex data buffering in high-speed serial interface subsystems such as 10G/25G Ethernet, CPRI, and OTN framer applications.

FAQ

What is the function of the DOFF pin on CY7C2563XV18-633BZXC?

The DOFF (Data Output OFF) pin selects read latency mode: when driven HIGH, the device operates in QDR II+ mode with 2.5-cycle read latency; when driven LOW or tied to VSS, it reverts to QDR I mode with 1-cycle latency. This pin is sampled at power-up and remains latched until reset, enabling runtime latency tuning without changing clocking or control logic.

How does on-die termination (ODT) work on this SRAM?

ODT is enabled via the ODT pin and calibrated using an external resistor on the ZQ pin. A LOW on ODT selects RQ/3.33 (e.g., 175–350 Ω ZQ → 52–105 Ω termination); HIGH selects RQ/1.66 (e.g., 175–250 Ω ZQ → 105–150 Ω). ODT applies to D[17:0], BWS[1:0], and K/K inputs, eliminating need for 24+ external 50 Ω resistors and associated PCB area.

Can CY7C2563XV18-633BZXC be used with a single-ended clock source?

No - the device requires true differential K/K clock inputs. The internal timing architecture relies on complementary edges for address/data capture and output registration. Driving K with a clock and tying K to ground violates AC timing specifications and causes functional failure. A dedicated differential clock driver or transformer is mandatory.

What is the role of the QVLD signal in system timing?

QVLD is a synchronous, edge-aligned output that pulses HIGH for one K/K cycle precisely when Q[17:0] data is valid and stable. Unlike static enable signals, QVLD tracks burst boundaries and accounts for internal pipeline delays - allowing receivers to sample data without fixed delay tables or complex deskew logic, especially critical above 600 MHz.