Infineon Technologies CY7C1512AV18-250BZXI

Overview

CY7C1512AV18-250BZXI from Cypress Semiconductor is a 4M × 18 (72-Mbit), 1.8V QDR® II SRAM with dual 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 uses 165-ball FBGA (15 × 17 × 1.4 mm), HSTL I/O, and supports depth expansion via RPS/WPS control - deployed in high-bandwidth packet buffering for network line cards.

For engineers reviewing the CY7C1512AV18-250BZXI datasheet, CY7C1512AV18-250BZXI pinout, CY7C1512AV18-250BZXI application, or CY7C1512AV18-250BZXI equivalent, key selection criteria include burst timing alignment with echo clocks (CQ/CQ), DLL-enabled latency mode, byte-write select granularity (BWS[1:0]), and VDDQ = 1.4V–1.8V compatibility with HSTL-18 receivers.

Technical Context

This QDR II SRAM implements synchronous pipelined architecture with physically separate read and write data paths, eliminating bus turnaround overhead. Its dual-clock domain uses K/K for address/data capture and C/C for output timing, with echo clocks CQ/CQ referenced to C/C to compensate for flight-time skew in multi-device systems.

The device supports two operational modes: DLL-enabled (1.5-cycle read latency, up to 250 MHz) and DLL-off (1-cycle latency, QDR I timing, ≤167 MHz). Internal organization as two 2M × 18 arrays enables concurrent access across banks, while BWS[1:0] provides per-byte write masking for D[8:0] and D[17:9], preserving unselected data during partial writes.

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 (Pb-free).

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 IS61WV102418B, CY7C1512AV18-250BZXI delivers 4× higher density and 2.5× greater bandwidth with deterministic 1.5-cycle latency and echo-clock timing - critical for 40G+ packet processing where bus turnaround elimination directly reduces pipeline stalls.

Availability

CY7C1512AV18-250BZXI is available at Aetrix Electronics and suitable for high-speed packet buffering, telecom line card memory, depth-expanded SRAM arrays, and multi-port baseband buffering requiring stable component supply across extended production lifecycles.

Supply support for CY7C1512AV18-250BZXI 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 focus on signal integrity and timing precision.

CY7C1512AV18 belongs to the QDR II SRAM product line, engineered specifically for deterministic, low-latency, concurrent-access memory subsystems in packet-switched infrastructure and high-speed serial data processing systems.

FAQ

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

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 limited 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 to VDDQ.

How does the ZQ pin affect output driver impedance?

The ZQ pin connects to an external resistor (RQ) tied to ground to calibrate output driver impedance. The device sets CQ, CQ, and Q[17:0] output impedance to 0.2 × RQ. If ZQ is tied directly to VDDQ, minimum impedance mode is enabled. ZQ must never be left floating or connected to GND, as this disables calibration and risks signal integrity failure.

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

Yes - it supports single-clock mode using only K/K to drive both input registers and output registers (replacing C/C). In this mode, data output timing references K/K edges, eliminating need for separate output clocks. However, echo clocks (CQ/CQ) remain inactive, and flight-time skew compensation is lost, limiting usable trace length and maximum reliable frequency.

What is the role of BWS[1:0] in byte-write operations?

BWS[1:0] are active-LOW byte write select signals that independently enable writing to D[8:0] (BWS0) and D[17:9] (BWS1). When asserted, corresponding 9-bit data segments are written; when deasserted, those bytes retain prior values. This enables efficient read-modify-write sequences without full-word reads or external masking logic.