Infineon Technologies CY7C1263V18-375BZXC

Overview

CY7C1263V18-375BZXC from Cypress Semiconductor is a 2M × 18-bit (36-Mbit), 1.8V QDR-II+ SRAM with separate read/write ports, 375 MHz clock operation (800 Mbps DDR data rate), 2.5-cycle read latency, and HSTL I/O supporting 1.4V–1.8V VDDQ. It delivers concurrent high-bandwidth memory access for network packet buffering in telecom line cards.

For engineers reviewing the CY7C1263V18-375BZXC datasheet, CY7C1263V18-375BZXC pinout, CY7C1263V18-375BZXC application, or CY7C1263V18-375BZXC equivalent, key selection criteria include burst depth (4-word), DLL-enabled timing accuracy, echo clock (CQ/CQ) support for source-synchronous capture, and FBGA-165 package compatibility with high-speed PCB layout constraints.

Technical Context

The device implements a true dual-port synchronous architecture with independent K and K input clocks driving separate read and write pipelines. Its Delay Lock Loop (DLL) aligns CQ/CQ echo clocks to K/K edges with sub-cycle precision, enabling reliable data capture at 800 Mbps without external phase alignment circuitry.

All address, control, and data signals are registered on rising edges of K or K; writes are self-timed and fully synchronous. The 19-bit multiplexed address bus supports 2M-depth addressing, while BWS[1:0] enables byte-level write masking across two 9-bit lanes - critical for partial-word updates in protocol header processing.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm footprint, 1.4 mm height, 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 AS7C362000B-375BIN and IS61WV102418BLL-375TQLI, CY7C1263V18-375BZXC uniquely delivers concurrent 375 MHz dual-port operation with DLL-synchronized echo clocks - essential for deterministic timing in packet-switched infrastructure where jitter-induced retransmissions are unacceptable.

Availability

CY7C1263V18-375BZXC is available at Aetrix Electronics and suitable for telecom switching systems, high-speed test instrumentation, network processor co-processing, and protocol acceleration modules requiring stable component supply across extended product lifecycles.

Supply support for CY7C1263V18-375BZXC 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 networking, automotive, and industrial applications, with emphasis on signal integrity and timing precision.

CY7C1263V18 belongs to the QDR-II+ SRAM product line, engineered specifically for deterministic, low-latency, concurrent memory access in packet-forwarding and high-speed data acquisition systems.

FAQ

What is the function of the DOFF pin on CY7C1263V18-375BZXC?

The DOFF pin disables the internal Delay Lock Loop when pulled LOW. In this mode, the device operates in QDR-I timing with reduced maximum frequency (167 MHz) and no echo clock alignment. For full QDR-II+ performance at 375 MHz, DOFF must be tied HIGH via ≤10 kΩ resistor to VDDQ.

How does the ZQ pin affect output impedance calibration?

ZQ connects to an external resistor (RQ) to ground, setting CQ, CQ, and Q[17:0] output impedance to 0.2 × RQ. If tied directly to VDDQ, it enables minimum impedance mode. ZQ must never float or connect to GND - improper biasing causes signal integrity failure and timing violations.

Can CY7C1263V18-375BZXC operate with only the K clock (not K)?

No. Both K and K clocks are mandatory: K latches read-related signals (RPS, A[18:0]), K latches write-related signals (WPS, BWS[1:0], D[17:0]). Omitting either clock halts functional operation - the architecture requires dual-edge-synchronized control for true port independence.

What is the purpose of the QVLD signal in system timing design?

QVLD asserts synchronously with the first valid data transfer on Q[17:0] during a read burst. It provides a deterministic, clock-aligned strobe for downstream logic to capture data without relying on fixed delay assumptions - critical for meeting setup/hold margins in FPGA-based packet parsers.