Infineon Technologies CY7C1512AV18-250BZXIT

Overview

CY7C1512AV18-250BZXIT from Cypress Semiconductor is a 4M × 18 (72-Mbit), 1.8V QDR® II SRAM with independent read/write ports, 250 MHz clock operation, 1.5-cycle read latency (DLL enabled), and DDR interfaces on both ports delivering 500 MT/s effective data rate. It implements synchronous pipelined burst architecture for high-bandwidth networking buffers in packet-switching ASICs.

For engineers reviewing the CY7C1512AV18-250BZXIT datasheet, CY7C1512AV18-250BZXIT pinout, CY7C1512AV18-250BZXIT application, or CY7C1512AV18-250BZXIT equivalent, key selection criteria include dual-clock timing control (K/K, C/C), echo clocks (CQ/CQ) for source-synchronous capture, HSTL-18 I/O compliance, DLL-enabled latency tuning, and 165-ball FBGA package compatibility with depth-expansion port selects (RPS/WPS).

Technical Context

This QDR II SRAM uses separate K/K input clocks to latch address and control signals and independent C/C output clocks to drive Q[17:0] with precise deskew control. Echo clocks CQ/CQ are free-running and synchronized to C/C, enabling controller-side data capture alignment across multiple devices.

The device supports two operational modes: DLL-on mode (1.5-cycle read latency, up to 250 MHz) and DLL-off mode (1-cycle latency, QDR I timing, max 167 MHz). Byte write select pins BWS[1:0] enable selective 9-bit byte updates without read-modify-write overhead.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 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 QDR II SRAM applications.

Compared with IDT72T3615L10BG and IS61WV102418BLL-10BLI, CY7C1512AV18-250BZXIT uniquely delivers HSTL-18–compliant 500 MT/s DDR throughput with echo-clock–assisted capture and programmable DLL latency-enabling deterministic, scalable memory subsystems in high-end networking silicon.

Availability

CY7C1512AV18-250BZXIT is available at Aetrix Electronics and suitable for packet buffering in network switches, line-card memory in telecom base stations, and deep packet inspection engines requiring stable component supply and long-term lifecycle support.

Supply support for CY7C1512AV18-250BZXIT 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.

CY7C1512AV18 belongs to Cypress's QDR II SRAM product line, engineered specifically for ultra-low-latency, full-duplex memory subsystems in packet-processing ASICs and FPGA-based networking hardware.

FAQ

What is the function of the DOFF pin on CY7C1512AV18-250BZXIT?

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 standard QDR II operation 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 signal integrity in high-speed designs?

The ZQ pin enables dynamic output impedance calibration: connecting it to a precision resistor (RQ) to ground sets Q[17:0], CQ, and CQ driver impedance to exactly 0.2 × RQ. This matches the SRAM's output drivers to the PCB trace impedance, minimizing reflections and maintaining clean eye diagrams at 500 MT/s-critical for reliable operation without manual trace-length tuning.

Can CY7C1512AV18-250BZXIT operate with only one clock pair instead of two?

Yes-it supports single-clock mode using only K/K to control both input and output registers. In this configuration, C/C are unused, and Q[17:0] are clocked by K/K instead of C/C. However, echo clocks (CQ/CQ) remain functional and synchronized to K/K, preserving source-synchronous capture capability while simplifying clock distribution.

What is the purpose of the BWS[1:0] pins and how do they improve system efficiency?

BWS[1:0] (Byte Write Select) are active-LOW signals that enable selective 9-bit byte writes: BWS0 controls D[8:0], BWS1 controls D[17:9]. When a BWS signal is deasserted, the corresponding byte remains unaltered in memory. This eliminates the need for read-modify-write sequences during partial-word updates-reducing bus traffic and latency in applications like header editing or metadata patching.