Infineon Technologies CY7C1518AV18-250BZC

Overview

CY7C1518AV18 from Cypress Semiconductor is a 72-Mbit (4 M × 18) DDR-II synchronous SRAM with two-word burst architecture, 300-MHz clock support, 1.8-V core supply, and HSTL I/O. It uses dual input clocks (K/K̄) for address/data capture and dual output clocks (C/C̄) with echo clocks (CQ/CQ̄) to minimize skew in high-speed memory subsystems. Designed for bandwidth-intensive networking and telecom line cards requiring deterministic low-latency access.

For engineers reviewing the CY7C1518AV18 datasheet, CY7C1518AV18 pinout, CY7C1518AV18 application, or CY7C1518AV18 equivalent, key selection criteria include DDR-II timing compliance, DLL-enabled 1.5-cycle read latency, HSTL-18 I/O drive capability, and 165-ball FBGA (15 × 17 mm) package compatibility with high-density PCB layouts.

Technical Context

The CY7C1518AV18 implements a synchronous pipelined SRAM core with integrated DDR-II peripheral logic, including a 1-bit burst counter that increments A0 to deliver two consecutive 18-bit words per access. All synchronous inputs (address, R/W, BWS, LD) are registered on rising edges of K/K̄, while data outputs are edge-aligned to C/C̄ or K/K̄ in single-clock mode.

It supports both DLL-on (1.5-cycle read latency, up to 300 MHz) and DLL-off (1-cycle read latency, up to 167 MHz DDR-I operation) modes. Echo clocks CQ/CQ̄ are phase-synchronized to C/C̄ and enable source-synchronous data capture without board-level trace length matching across multiple devices.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 15 mm × 17 mm footprint, 1.4 mm height, 0.8 mm ball pitch, JEDEC MO-245 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed synchronous SRAM applications.

Compared with IS61WV102418BLL-10BLI and MT47H64M16HR-25E, the CY7C1518AV18 uniquely delivers deterministic sub-2-cycle latency, DDR-II burst efficiency, and echo-clock–based source-synchronous timing - critical for real-time packet and signal processing where jitter and pipeline stalls must be eliminated.

Availability

CY7C1518AV18 is available at Aetrix Electronics and suitable for packet buffering in network switches, line card memory in telecom infrastructure, and baseband processing in wireless base stations requiring stable component supply and long-term industrial availability.

Supply support for CY7C1518AV18 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 connectivity solutions for industrial, automotive, and communications markets.

The CY7C15xxAV18 family was designed specifically for deterministic, high-bandwidth memory subsystems in networking and telecom equipment where DDR-II timing predictability, echo-clock synchronization, and low-latency burst access are mandatory.

FAQ

What is the minimum setup/hold time requirement for LD relative to K clock?

The LD signal must meet a 1.2 ns setup time and 0.8 ns hold time relative to the rising edge of K, as specified in the AC Electrical Characteristics table (Rev. *F, Page 20). These values are guaranteed across commercial temperature range (0°C to +70°C) and 1.8 V ±5% supply conditions. Violating these margins risks metastability in burst initiation and may cause address or R/W sampling errors.

Can C and C̄ be driven from the same differential clock source as K and K̄?

Yes - C and C̄ may be driven from the same differential clock generator as K and K̄, provided the inter-pair skew between (C/C̄) and (K/K̄) remains ≤150 ps. The device does not require independent clock domains; however, using separate sources improves deskew margin when driving multiple SRAMs from a single controller.

How does ZQ calibration affect signal integrity on the DQ bus?

ZQ calibration adjusts output driver impedance to match the 48 Ω characteristic impedance of standard HSTL-18 transmission lines. Without calibration, output impedance variation (±20%) causes reflections and eye closure at 600 MT/s. Calibration ensures return loss >15 dB and maintains >0.4 V noise margin at the receiver under worst-case PVT conditions.

Is the CY7C1518AV18 compatible with DDR3 or DDR4 controllers?

No - it is not electrically or protocol-compatible with DDR3/DDR4 controllers. It implements a proprietary DDR-II SRAM interface with fixed two-word burst, synchronous load (LD), and echo clocks (CQ/CQ̄). Controllers must implement Cypress's specific command encoding, timing, and clocking scheme as defined in Document 001-06982.