Cypress Semiconductor Corp CY7C1263KV18-400BZI

Overview

CY7C1263KV18 from Cypress Semiconductor is a 2M × 18, 36-Mbit QDR® II+ SRAM with separate read/write ports, 400 MHz maximum clock frequency (2.5-cycle read latency), 1.8 V core supply, and 1.4–1.8 V I/O supply. It delivers 1100 MT/s DDR data throughput on both ports and is packaged in a 165-ball FBGA (13 × 15 × 1.4 mm) for high-speed networking buffer applications.

For engineers reviewing the CY7C1263KV18 datasheet, CY7C1263KV18 pinout, CY7C1263KV18 application, or CY7C1263KV18 equivalent, key selection criteria include concurrent read/write bandwidth, echo clock timing support (CQ/CQ), QVLD data validity signaling, DOFF-controlled PLL mode selection, and HSTL-compatible 18-bit bidirectional data interface.

Technical Context

The CY7C1263KV18 implements a synchronous pipelined architecture with independent K and K input clocks driving separate read and write pipelines. All address and control inputs are registered on rising edges of K/K, while data outputs are edge-aligned to CQ/CQ echo clocks for precise capture in high-speed systems.

It supports four-word burst transfers per access, delivering 72 bits (4 × 18) per read or write cycle. With DOFF HIGH, it operates in QDR II+ mode at 2.5-cycle read latency; with DOFF LOW, it reverts to QDR I mode (1-cycle latency, ≤167 MHz). The integrated PLL enables accurate data placement and jitter reduction.

Key Specifications

Pinout & Package

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

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, CY7C1263KV18 uniquely delivers 400 MHz DDR operation with integrated PLL, echo clocks, and QVLD-enabling deterministic sub-nanosecond timing closure in 10G+ networking and test systems where concurrent bandwidth and data validity assurance are mandatory.

Availability

CY7C1263KV18 is available at Aetrix Electronics and suitable for high-speed networking equipment, automated test instrumentation, wireless baseband processors, and PCIe infrastructure requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1263KV18 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 applications.

The QDR® II+ SRAM product line targets ultra-low-latency, high-throughput buffering in networking, test, and signal processing systems where deterministic timing and concurrent access are critical.

FAQ

What is the function of the DOFF pin on CY7C1263KV18?

The DOFF (PLL Disable) 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. When held HIGH (typically via 10 kΩ pull-up), it enables full QDR II+ operation at up to 400 MHz with 2.5-cycle latency and echo clock functionality.

How does the ZQ pin affect output driver impedance?

The ZQ pin connects to an external resistor (RQ) tied to ground, enabling on-die impedance calibration. The device sets its CQ, CQ, and Q[17:0] output driver impedance to 0.2 × RQ. If ZQ is tied directly to VDDQ, the device enters minimum-impedance mode. ZQ must never be left floating or connected to GND, as this disables calibration and risks signal integrity failure.

Can CY7C1263KV18 support byte-level writes?

Yes. The device supports byte-selective writes using BWS0 and BWS1 pins. BWS0 controls D[8:0], and BWS1 controls D[17:9]. Both are active-LOW synchronous inputs sampled on K/K rising edges. When a BWS signal is deasserted, the corresponding 9-bit byte is ignored during the write cycle, preserving prior data in those bits.

What timing role do CQ and CQ serve in system design?

CQ and CQ are free-running echo clocks synchronized to K and K, respectively. They provide a clean, low-jitter reference aligned to Q[17:0] output transitions and QVLD assertion. System receivers use CQ/CQ-not K/K-to clock data capture registers, eliminating setup/hold violations caused by clock skew and PCB trace mismatch in >400 MHz designs.