Infineon Technologies CG7611AA

Overview

CG7611AA from Cypress Semiconductor is a 36-Mbit DDR II synchronous SRAM with two-word burst architecture, configured as 2M × 18, operating at 333 MHz clock frequency with 666 MHz effective data rate, 1.8 V core supply, and HSTL I/O compatible with 1.5 V/1.8 V IO supply - deployed in high-bandwidth networking packet buffers and telecom line-card memory subsystems.

For engineers reviewing the CG7611AA datasheet, CG7611AA pinout, CG7611AA application, or CG7611AA equivalent, this device requires attention to DOFF-configurable read latency (1 vs. 1.5 cycles), echo clock (CQ/CQ) timing alignment, dual-K/K input clock domain management, and byte-write select (BWS0/BWS1) mapping for 18-bit data width.

Technical Context

The CG7611AA implements a synchronous pipelined SRAM core with DDR II interface logic, using separate K/K input clocks for address/control latching and C/C output clocks for data capture - enabling precise skew control across multi-device memory channels. Its internal burst counter increments on A0 to deliver two consecutive 18-bit words per access.

It supports both single-clock mode (K/K only) and dual-clock mode (C/C + CQ/CQ), with echo clocks tightly aligned to output data edges to eliminate board-level flight-time compensation. The DOFF pin selects between DDR-I (1-cycle latency, DOFF = LOW) and DDR-II (1.5-cycle latency, DOFF = HIGH) operation modes.

Key Specifications

Pinout & Package

CG7611AA is housed in a 165-ball Fine-Pitch Ball Grid Array (FBGA) package measuring 13 mm × 15 mm × 1.4 mm, with 0.8 mm ball pitch and Pb-free option available. Pin assignments follow CY7C1418KV18 layout per datasheet 001-57827 Rev. *L.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1418KV18, CG7611AA offers identical functionality with certified industrial qualification; versus AS7C33618A-333BNI, it delivers superior signal integrity via ZQ calibration and eliminates timing uncertainty through echo clocks - critical for multi-drop DDR bus designs.

Availability

CG7611AA is available at Aetrix Electronics and suitable for telecom line cards, high-speed packet buffers, baseband processing units, and radar signal processing modules requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for CG7611AA 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 logic solutions for industrial, automotive, and communications markets.

CG7611AA belongs to Cypress's DDR II SRAM product line, engineered specifically for deterministic, low-latency, high-bandwidth memory interfacing in networking and signal processing systems where burst efficiency and timing precision are critical.

FAQ

What is the function of the DOFF pin on CG7611AA?

The DOFF (DDR Off) pin configures the device's read latency mode: when asserted HIGH, it enables DDR-II operation with 1.5-cycle read latency; when LOW, it reverts to DDR-I mode with 1-cycle latency. This selection directly affects the internal pipeline staging and must be set before initialization and held stable during operation.

Can CG7611AA operate without C and C output clocks?

Yes - CG7611AA supports single-clock mode where K and K serve as both input and output clocks. In this mode, read data is driven on K/K rising edges, and CQ/CQ are generated relative to K/K. However, echo-clock benefits (flight-time deskewing) are lost, requiring tighter PCB trace length matching.

How is output impedance calibrated using the ZQ pin?

ZQ connects to an external precision resistor (RQ) tied to ground; the device measures RQ and adjusts its DQ and CQ driver strength to 0.2 × RQ, achieving 25–35 Ω output impedance. Connecting ZQ directly to VDDQ enables minimum impedance mode (~17 Ω); floating or grounding ZQ is prohibited and may damage the device.

Is CG7611AA pin-compatible with CY7C1420KV18?

No - CG7611AA (2M × 18) and CY7C1420KV18 (1M × 36) have different data widths, address counts (21 vs. 20), BWS pin count (2 vs. 4), and distinct FBGA pin mappings. Their ballouts are incompatible; migration requires PCB redesign and firmware address logic changes.