Cypress Semiconductor Corp CY7C1314KV18-250BZXI

Overview

CY7C1314KV18-250BZXI from Cypress Semiconductor is a 512K × 36-bit, 18-Mbit QDR® II SRAM with separate read/write ports, 250 MHz operation (4 ns clock period), 1.8 V core supply, and 1.4–1.8 V I/O supply. It delivers 1.8 Gbps bandwidth via DDR interfaces on both ports, supports two-word burst transfers, and uses echo clocks (CQ/CQ) for high-speed data capture in networking and packet buffering applications.

For engineers reviewing the CY7C1314KV18-250BZXI datasheet, CY7C1314KV18-250BZXI pinout, CY7C1314KV18-250BZXI application, or CY7C1314KV18-250BZXI equivalent, key selection criteria include its 512K × 36 organization, dual-clock DDR timing (K/K and C/C), DOFF-configurable 1-cycle vs. 1.5-cycle read latency, and 165-ball FBGA package compatibility with HSTL-18 I/O standards.

Technical Context

The CY7C1314KV18 implements QDR II architecture with fully independent read and write ports sharing a multiplexed 18-bit address bus (A[17:0]). All synchronous inputs are registered on rising edges of K/K clocks; outputs are registered on C/C clocks, enabling precise DDR timing without bus turnaround.

It integrates a PLL for accurate data placement, JTAG 1149.1 test access, programmable output impedance via ZQ pin, and byte-write select (BWS[3:0]) for granular 9-bit write control. The device operates in either dual-clock mode (C/C + K/K) or single-clock mode (K/K only), with echo clocks CQ/CQ synchronized to C/C for deskewed data capture.

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 construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar QDR II SRAM applications.

Compared with IDT72T3615L10PA and IS61WV102436BLL-15BLI, CY7C1314KV18-250BZXI offers superior timing robustness via echo clocks and programmable impedance, higher bandwidth (1.8 Gbps), and configurable latency-making it optimal for new 10G+ networking designs demanding signal integrity and design margin.

Availability

CY7C1314KV18-250BZXI is available at Aetrix Electronics and suitable for packet buffering in network switches, line card memory in telecom routers, NPU co-processor memory, and high-speed test equipment pattern storage requiring stable component supply and long-term lifecycle support.

Supply support for CY7C1314KV18-250BZXI 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 U.S.-based semiconductor company specializing in high-performance memory, microcontrollers, and connectivity solutions for industrial, automotive, and communications markets.

CY7C1314KV18 belongs to Cypress's QDR II SRAM product line, designed specifically for high-throughput, low-latency packet processing and buffering in networking infrastructure where deterministic dual-port access and source-synchronous timing are essential.

FAQ

What is the function of the DOFF pin on CY7C1314KV18-250BZXI?

The DOFF (Data Output OFF) pin configures read latency: when tied HIGH, it enables QDR II mode with 1.5-cycle latency for improved timing margin; when tied LOW or to VSS, it reverts to QDR I mode with 1-cycle latency for maximum speed. This pin is sampled at power-up and remains static during operation-no dynamic switching is supported.

Can CY7C1314KV18-250BZXI operate with only one clock signal (K) instead of K/K?

Yes-it supports single-clock mode where K serves as both input and output clock. In this configuration, C and C are unused, and data is clocked out on K/K edges. However, echo clocks (CQ/CQ) remain functional and synchronized to K, preserving their utility for data capture alignment even without dedicated C/C inputs.

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

ZQ connects to an external resistor (typically 240 Ω) to ground to calibrate the output driver impedance of Q[35:0] and CQ/CQ pins to ~48 Ω (0.2 × RQ). This matching minimizes reflections on controlled-impedance PCB traces, directly improving eye diagram opening and reducing bit error rates at 250 MHz DDR rates.

Is CY7C1314KV18-250BZXI pin-compatible with other QDR II SRAMs in the same package?

No-while it shares the 165-ball FBGA footprint with some Cypress QDR II devices (e.g., CY7C1312KV18), pin assignments differ significantly due to its 36-bit data width and expanded BWS[3:0] and address bus. Direct replacement requires schematic and layout revision; cross-reference must be verified against each device's pin definition table.