Infineon Technologies CY7C1314KV18-250BZXCT

Overview

CY7C1314KV18-250BZXCT from Cypress Semiconductor is a 512K × 36-bit, 18-Mbit QDR® II SRAM with separate read/write ports, 250 MHz maximum clock frequency (40 ns cycle time), 1.8 V core supply (VDD = 1.8 V ±0.1 V), and 1.4–1.8 V I/O supply (VDDQ). It delivers concurrent burst reads/writes at 500 MT/s per port using DDR interfaces and supports depth expansion via RPS/WPS and BWS[3:0]. Used in high-bandwidth packet buffering for network switches and routers.

For engineers reviewing the CY7C1314KV18-250BZXCT datasheet, CY7C1314KV18-250BZXCT pinout, CY7C1314KV18-250BZXCT application, or CY7C1314KV18-250BZXCT equivalent, key selection criteria include dual-port concurrency, echo-clock–assisted data capture, programmable output impedance via ZQ, and DOFF-configurable 1-cycle (QDR I) vs. 1.5-cycle (QDR II) read latency.

Technical Context

The device implements true dual-port synchronous architecture: independent K/K clocks latch write addresses and data, while C/C clocks drive read outputs with echo clocks CQ/CQ aligned to output timing. All accesses are rising-edge–triggered; no bus turnaround is required due to physically separated D[35:0] inputs and Q[35:0] outputs.

It uses on-chip PLL for precise data placement, supports JTAG 1149.1 boundary scan, and enables byte-selective writes via four active-low BWS signals-BWS0–BWS3 each controlling nine bits of the 36-bit data bus. Internal organization is two 256K × 36 arrays, accessed via 18-bit multiplexed address bus (A[17:0]).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102436BLL-15BLI, CY7C1314KV18-250BZXCT uniquely combines echo-clock–assisted timing closure, ZQ-based impedance tuning, and DOFF-selectable latency-making it optimal for new 250 MHz+ designs demanding signal integrity and design margin.

Availability

CY7C1314KV18-250BZXCT is available at Aetrix Electronics and suitable for network switching, telecom line card development, baseband processing, and automated test equipment requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1314KV18-250BZXCT 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 system-level timing robustness.

CY7C1314KV18 belongs to Cypress's QDR II SRAM product line, engineered specifically for high-throughput, low-latency packet buffering and burst-oriented memory subsystems in carrier-grade infrastructure.

FAQ

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

The DOFF (Data Output OFF) pin configures read latency mode: when asserted HIGH, the device operates in QDR II mode with 1.5-cycle read latency; when LOW (or tied to VSS), it reverts to QDR I mode with 1-cycle latency. This setting directly affects internal pipeline staging and must be fixed at power-up-it is not dynamically switchable during operation.

How does the ZQ pin enable output impedance calibration?

The ZQ pin connects to an external precision resistor (RQ) to ground, typically 50 Ω. The device measures this resistance and adjusts its output drivers (Q[35:0], CQ, CQ) to achieve 0.2 × RQ output impedance-e.g., 10 Ω for 50 Ω RQ. This compensates for process/voltage/temperature variation and matches PCB trace impedance without requiring external termination resistors.

Can CY7C1314KV18-250BZXCT operate with only a single clock domain?

Yes-the device supports single-clock mode where K and C are tied together (and K and C likewise), eliminating the need for separate clock nets. In this mode, Q[35:0] data is driven on K/K edges instead of C/C, and CQ/CQ are generated relative to K/K. However, echo-clock benefits and skew mitigation are lost, and timing margins tighten accordingly.

What is the purpose of BWS[3:0] signals in write operations?

BWS[3:0] are active-low byte write select signals that gate individual 9-bit segments of the 36-bit D[35:0] bus. When a BWS bit is deasserted (HIGH), the corresponding 9-bit byte is ignored during the write cycle, preserving existing memory contents in those bits. This enables partial-word updates without read-modify-write sequences-critical for metadata field manipulation in packet buffers.