Cypress Semiconductor Corp CY7C1514AV18-250BZC

Overview

CY7C1514AV18-250BZC from Cypress Semiconductor is a 72-Mbit QDR® II SRAM with 2M × 36 organization, 250 MHz clock operation, 1.8 V core supply (VDD), and 1.4–1.8 V I/O supply (VDDQ), delivering 500 MT/s DDR throughput on both read and write ports for high-bandwidth packet buffering in network switches.

For engineers reviewing the CY7C1514AV18-250BZC datasheet, CY7C1514AV18-250BZC pinout, CY7C1514AV18-250BZC application, or CY7C1514AV18-250BZC equivalent, key selection considerations include dual-clock DDR timing (K/K and C/C), echo clocks (CQ/CQ) for source-synchronous capture, DLL-enabled 1.5-cycle read latency, and 165-ball FBGA (15 × 17 × 1.4 mm) package compatibility with HSTL-18 I/O.

Technical Context

The CY7C1514AV18-250BZC implements a true dual-port synchronous architecture with physically separate read and write data paths-Q[35:0] outputs and D[35:0] inputs-eliminating bus turnaround overhead. It uses independent K/K input clocks for address/data capture and C/C output clocks for data launch, with CQ/CQ echo clocks aligned to C/C for precise PCB trace deskew.

Internally organized as two 1M × 36 arrays, it supports 2-word burst transfers per access, synchronized by a Delay Lock Loop (DLL) that enables 1.5-cycle read latency at 250 MHz; when DOFF = LOW, it reverts to QDR I mode with 1-cycle latency and max 167 MHz operation.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm × 1.4 mm body, 1.0 mm ball pitch, RoHS-compliant (Pb-free option available).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72T3615L10BG and IS61WV102436B, the CY7C1514AV18-250BZC delivers 2× higher density, 2.5× higher bandwidth, and integrated DLL + echo clocks-making it uniquely suited for next-generation 10G+ networking ASIC interfaces demanding deterministic sub-2-cycle latency and source-synchronous timing closure.

Availability

CY7C1514AV18-250BZC is available at Aetrix Electronics and suitable for high-bandwidth packet buffering, telecom line card memory, network processor offload, and ultra-low-latency financial infrastructure requiring stable component supply and long-term obsolescence management.

Supply support for CY7C1514AV18-250BZC 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 fabless semiconductor company specializing in high-performance memory, microcontrollers, and programmable solutions for networking, automotive, and industrial markets.

The CY7C1514AV18 belongs to Cypress's QDR II SRAM product line, engineered specifically for ASIC/FPGA-based networking equipment requiring deterministic, dual-port, high-throughput memory with source-synchronous timing and minimal latency variation.

FAQ

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

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 mode with 1-cycle read latency and maximum frequency reduced to 167 MHz. For full QDR II performance at 250 MHz with 1.5-cycle latency, DOFF must be held HIGH via a ≤10 kΩ pull-up resistor to VDDQ.

How does the ZQ pin affect output drive strength?

The ZQ pin calibrates the output impedance of Q[35:0], CQ, and CQ pins to match the system data bus. Connecting ZQ to a precision resistor (RQ) to ground sets output impedance to 0.2 × RQ; connecting ZQ directly to VDDQ enables minimum impedance mode. ZQ must never be left floating or tied to GND, as this disables calibration and risks signal integrity failure.

Can CY7C1514AV18-250BZC operate with only one clock pair?

Yes - the device supports single-clock mode using only K/K for both input registration and output launching (Q[35:0] timed to K/K instead of C/C). In this mode, echo clocks CQ/CQ are generated relative to K/K, and C/C pins may be left unconnected. However, dual-clock mode with C/C and CQ/CQ is required to achieve full 250 MHz timing margins and source-synchronous capture.

What is the role of BWS[3:0] in byte-write operations?

BWS[3:0] are active-low byte write select signals that determine which 9-bit segments of the 36-bit D[35:0] bus are written during each half-burst. BWS0 controls D[8:0], BWS1 controls D[17:9], BWS2 controls D[26:18], and BWS3 controls D[35:27]. Deasserting any BWS[x] preserves the corresponding byte in memory, enabling efficient partial-word updates without read-modify-write cycles.