Cypress Semiconductor Corp CY7C1314CV18-200BZI

Overview

CY7C1314CV18 from Cypress Semiconductor is a 18-Mbit QDR® II SRAM with 512K × 36 organization, 2-word burst architecture, and dual DDR interfaces supporting 500 MHz data transfer on both read and write ports at 250 MHz clock frequency. It features separate read/write ports, echo clocks (CQ/CQ), DLL-enabled 1.5-cycle read latency, and operates at core VDD = 1.8 V ±0.1 V with IO VDDQ = 1.4–1.8 V. Used in high-bandwidth networking packet buffers and FPGA co-processor memory subsystems.

For engineers reviewing the CY7C1314CV18 datasheet, CY7C1314CV18 pinout, CY7C1314CV18 application, or CY7C1314CV18 equivalent, key selection criteria include x36 bus width support, 165-ball FBGA package compatibility, DLL-on/off timing modes, byte write select granularity (BWS[3:0]), and JTAG 1149.1 test access for system-level validation.

Technical Context

The CY7C1314CV18 implements a synchronous pipelined QDR II architecture with fully independent read and write ports sharing a multiplexed 18-bit address bus (A[17:0]). Read addresses latch on K rising edge; write addresses latch on K rising edge; output data is clocked by C/C with echo clocks CQ/CQ referenced to those edges.

It supports depth expansion via RPS/WPS control and byte-selectable writes using BWS[3:0], enabling partial 36-bit word updates without read-modify-write cycles. The integrated Delay Lock Loop (DLL) ensures precise 1.5-cycle read latency alignment when enabled; in DLL-off mode, it reverts to QDR I timing with 1-cycle latency up to 167 MHz.

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-speed dual-port SRAM applications.

Compared with IDT72T3615L10BG and IS61WV102436B, the CY7C1314CV18 uniquely balances 18-Mbit density, 1.4–1.8 V VDDQ flexibility, DLL-adjustable latency, and full QDR II feature set - making it optimal for power-constrained, high-throughput embedded telecom and FPGA acceleration designs.

Availability

CY7C1314CV18 is available at Aetrix Electronics and suitable for high-speed networking equipment, FPGA-based protocol accelerators, telecom baseband units, and real-time video processing systems requiring stable component supply across extended product lifecycles.

Supply support for CY7C1314CV18 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 programmable solutions for industrial, automotive, and communications markets.

The QDR II SRAM product line was engineered specifically for deterministic, low-latency, high-bandwidth memory interfacing in packet-processing and FPGA-accelerated systems - emphasizing concurrent access, echo-clock synchronization, and DLL-controlled timing precision.

FAQ

What is the function of the DOFF pin on CY7C1314CV18?

The DOFF (DLL Turn Off) pin is an active-low control that disables the internal Delay Lock Loop. When pulled low, the device operates in QDR I timing mode with 1-cycle read latency and maximum frequency reduced to 167 MHz. For normal QDR II operation, DOFF must be tied high via ≤10 kΩ pull-up resistor to VDDQ.

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

The ZQ pin connects to an external resistor to ground to calibrate the output driver impedance of Q[35:0], CQ, and CQ pins to match the PCB trace characteristic impedance (typically 50 Ω). This calibration reduces signal reflections and improves timing margins - especially critical at 500 MT/s data rates where mismatched termination causes significant eye closure.

Can CY7C1314CV18 operate with only one clock domain (K and C only)?

Yes. The device supports single-clock-domain operation where K and C are used together (and K/C are unused or tied appropriately). In this mode, data is captured and output using only the positive-edge clocks, simplifying clock tree design at the cost of reduced skew compensation capability compared to full differential clocking.

What is the role of BWS[3:0] during a write operation?

BWS[3:0] are active-low byte write select signals that independently enable or mask 9-bit segments of the 36-bit D[35:0] bus. When a BWS bit is low, its corresponding 9-bit byte is written; when high, that byte remains unaltered. This enables partial-word updates without requiring a read-modify-write sequence - essential for efficient metadata or descriptor table updates.