Cypress Semiconductor Corp CY7C1514AV18-250BZI

Overview

CY7C1514AV18-250BZI from Cypress Semiconductor is a 72-Mbit QDR® II SRAM with 2M × 36 organization, 1.8V core supply, and 250 MHz clock operation delivering 500 MT/s DDR throughput on both read and write ports. It features separate read/write data paths, 1.5-cycle read latency (DLL enabled), echo clocks (CQ/CQ), and HSTL I/O for high-speed networking buffers and packet memory in telecom switching systems.

For engineers reviewing the CY7C1514AV18-250BZI datasheet, CY7C1514AV18-250BZI pinout, CY7C1514AV18-250BZI application, or CY7C1514AV18-250BZI equivalent, key selection criteria include dual-clock DDR timing, DLL-controlled latency mode, byte-write select granularity (BWS[3:0]), FBGA-165 package compatibility, and QDR II–specific signal integrity requirements for >400 MHz system interfaces.

Technical Context

The CY7C1514AV18-250BZI implements a true dual-port synchronous architecture with physically independent read and write data buses (Q[35:0] and D[35:0]), eliminating bus turnaround overhead. Its internal 2M × 36 array is accessed via multiplexed address inputs (A[19:0]), latched alternately on rising edges of K/K for read/write operations.

It uses two dedicated output clock pairs - C/C for data capture and CQ/CQ as deskewed echo clocks - to compensate for flight-time mismatches across high-speed PCB traces. The DLL enables precise 1.5-cycle read latency alignment; disabling it via DOFF pin reverts behavior to QDR I mode with 1-cycle latency and reduced max frequency (167 MHz).

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm footprint, 1.4 mm height, RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV204836BLL-15BLI, CY7C1514AV18-250BZI uniquely delivers synchronized dual-clock DDR operation with echo clocks and DLL-controlled latency - enabling deterministic 500 MT/s performance in high-end networking and test equipment where timing predictability is non-negotiable.

Availability

CY7C1514AV18-250BZI is available at Aetrix Electronics and suitable for high-speed packet buffering, network switch fabric memory, telecom baseband processing, and test equipment pattern memory requiring stable component supply and long-term lifecycle assurance.

Supply support for CY7C1514AV18-250BZI 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 high-bandwidth, low-latency memory subsystems in networking, telecom, and test equipment - emphasizing deterministic timing, concurrent access, and signal integrity at multi-GHz data rates.

FAQ

What is the function of the DOFF pin on CY7C1514AV18-250BZI?

The DOFF (DLL Turn Off) pin is an active-low input that disables the internal Delay Lock Loop. When tied LOW, the device operates in QDR I mode with 1-cycle read latency and reduced maximum frequency (167 MHz). For standard QDR II operation at 250 MHz with 1.5-cycle latency, DOFF must be pulled HIGH via ≤10 kΩ resistor to VDDQ.

How does the ZQ pin affect output impedance calibration?

The ZQ pin connects to an external 240 Ω resistor to ground to calibrate the output drivers (Q[35:0], CQ, CQ) to 48 Ω (0.2 × 240 Ω). This matches standard 50 Ω PCB traces and minimizes reflections. Connecting ZQ directly to VDDQ enables minimum-impedance mode (~30 Ω); leaving it unconnected or grounded violates specifications and risks signal integrity failure.

Can CY7C1514AV18-250BZI operate in single-clock mode?

Yes - by using only the K/K pair to drive both input registers and output registers (Q[35:0]), the device enters single-clock mode. In this configuration, C/C are unused, and timing references shift entirely to K/K. Read latency remains 1.5 cycles (DLL enabled), but echo clock functionality (CQ/CQ) is retained for data capture alignment.

What is the purpose of BWS[3:0] in CY7C1514AV18-250BZI?

BWS[3:0] are active-low byte write select signals controlling four independent 9-bit segments of the 36-bit D[35:0] bus. Each asserted BWS[x] enables writing to its corresponding 9-bit byte group; deassertion preserves existing memory contents in that segment. This eliminates need for read-modify-write cycles during partial-word updates in packet editing or header manipulation.