Infineon Technologies CY7C12681KV18-450BZXC

Overview

CY7C12681KV18 from Cypress Semiconductor is a 36-Mbit DDR II+ SRAM with 2 M × 18 organization, 450 MHz max clock frequency, 2.5-cycle read latency, and HSTL I/O interface operating at 1.4–1.8 V VDDQ. It delivers 1100 MT/s effective data rate via double-data-rate transfers synchronized to K/K clocks and is used in high-bandwidth packet buffering for network switches and routers.

For engineers reviewing the CY7C12681KV18 datasheet, CY7C12681KV18 pinout, CY7C12681KV18 application, or CY7C12681KV18 equivalent, key selection criteria include confirmed 2.5-cycle latency mode operation, echo-clock–based data capture (CQ/CQ), QVLD timing alignment, and 165-ball FBGA (13 × 15 × 1.4 mm) mechanical compatibility.

Technical Context

This device implements a synchronous pipelined SRAM core with DDR II+ architecture: addresses are latched on alternate rising edges of K/K, and read data is driven on both K and K rising edges. The internal PLL ensures precise data placement relative to echo clocks CQ/CQ.

All synchronous inputs pass through K- or K-controlled registers; outputs are registered to K/K. Write operations use on-chip self-timed circuitry, and byte write selects (BWS[1:0]) enable granular 9-bit byte updates within the 18-bit DQ[17:0] bus.

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), 13 mm × 15 mm × 1.4 mm body height, 0.8 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C12681KV18-500BZXC, this -450BZXC variant trades 50 MHz clock headroom for lower power and relaxed timing closure; versus AS7C33618A-450BIN, it delivers superior signal integrity and reduced FPGA resource usage via integrated echo clocks and QVLD.

Availability

CY7C12681KV18 is available at Aetrix Electronics and suitable for network switching, telecom line card, high-frequency trading, and ATE pattern memory applications requiring stable component supply, long-term lifecycle support, and guaranteed FBGA package consistency.

Supply support for CY7C12681KV18 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 systems.

This device belongs to the DDR II+ SRAM product line, engineered specifically for deterministic, high-bandwidth buffering in networking and telecom infrastructure where echo-clock–synchronized data capture and low-latency burst access are critical.

FAQ

What is the function of the DOFF pin on CY7C12681KV18?

The DOFF (Data-Off) pin configures read latency mode: when asserted HIGH, it enables 2.5-cycle latency for higher throughput; when LOW, it reverts to 1-cycle latency for minimal access delay. This setting is sampled synchronously on the K clock and affects all subsequent read operations until changed.

How does ZQ calibration work and what external component is required?

ZQ calibration adjusts output driver impedance to match the system data bus by referencing an external 240 Ω resistor connected between the ZQ pin and ground. The device measures this resistance and scales its output strength to achieve 48 Ω (0.2 × 240 Ω), ensuring consistent signal integrity without discrete termination.

Can CY7C12681KV18 operate with only one of the K or K clocks?

No - the device requires both K and K differential clocks for correct operation. K captures address and control signals; both K and K sample write data and drive read data. Omitting either clock violates timing specifications and prevents functional access to the memory array.

What is the purpose of the QVLD signal and how is it timed?

QVLD indicates when DQ[17:0] carries valid read data. It is edge-aligned with the CQ and CQ echo clocks - meaning its assertion coincides precisely with the data-valid window defined by those clocks. This eliminates fixed-delay assumptions and simplifies FPGA capture logic design.