Infineon Technologies CG7599AA

Overview

CG7599AA from Cypress Semiconductor is a 18-Mbit DDR II SRAM with two-word burst architecture, configured as 1M × 18 (CY7C1318KV18), operating at 333 MHz clock frequency and delivering 666 MT/s data rate via double-data-rate interface. It uses 1.8 V core supply with HSTL I/O, supports programmable output impedance via ZQ pin, and is implemented in a 165-ball FBGA (13 × 15 × 1.4 mm) package for high-density memory subsystems in networking line cards and packet buffering applications.

For engineers reviewing the CG7599AA datasheet, CG7599AA pinout, CG7599AA application, or CG7599AA equivalent, this device requires attention to dual-clock timing (K/K and C/C), echo clock synchronization (CQ/CQ), DOFF-controlled read latency (1 vs. 1.5 cycles), byte-write select mapping (BWS0/BWS1), and HSTL voltage compliance (1.4 V–VDDQ) in high-speed synchronous memory designs.

Technical Context

The CG7599AA implements a synchronous pipelined SRAM core with integrated DDR II peripheral logic, including a 1-bit burst counter that increments A0 to generate sequential 18-bit word addresses on each K-edge. All address, control, and data inputs are registered on rising edges of K and K clocks, enabling precise setup/hold timing at 333 MHz.

Read data is driven synchronously on rising edges of C and C (or K and K in single-clock mode), with echo clocks CQ/CQ phase-aligned to C/C to eliminate board-level skew. The device integrates a PLL for accurate data placement and JTAG 1149.1 test access port for boundary scan validation.

Key Specifications

Pinout & Package

CG7599AA 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 RoHS-compliant Pb-free option. Pin assignments follow JEDEC MO-245AC standard for CY7C1318KV18.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1318KV18, CG7599AA offers identical performance and footprint but reflects current Cypress distribution channel branding; versus AS7C3108B-166JIN, it delivers 4× higher bandwidth and deterministic DDR timing essential for data-plane applications.

Availability

CG7599AA is available at Aetrix Electronics and suitable for packet buffering in switch ASICs, line card memory subsystems, network processor data caches, and high-speed test equipment requiring stable component supply and long-term obsolescence management.

Supply support for CG7599AA 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.

CG7599AA belongs to Cypress's DDR II SRAM product line, engineered specifically for high-bandwidth, low-latency data buffering in networking and telecom infrastructure where deterministic timing and signal integrity are critical.

FAQ

What is the function of the DOFF pin on CG7599AA?

The DOFF pin configures read latency mode: when asserted HIGH, it enables DDR II operation with 1.5-cycle read latency; when LOW, it reverts to DDR I behavior with 1-cycle latency. This setting must be stable before initialization and remains effective throughout operation. It does not affect write timing or burst structure.

Can CG7599AA operate with only a single clock domain (K only)?

Yes - CG7599AA supports single-clock mode where K serves as both input and output clock. In this mode, C and C are unused, and read data is driven on rising edges of K and K. However, echo clocks CQ/CQ remain active and referenced to K, preserving source-synchronous capture capability without external deskew circuitry.

How is output impedance calibrated using the ZQ pin?

ZQ connects to an external precision resistor (RQ) tied to ground; the internal circuit sets DQ and CQ driver impedance to 0.2 × RQ. Typical RQ values range from 240 Ω (yielding 48 Ω drive) to 330 Ω (66 Ω). ZQ must never be left floating or tied to GND - connecting to VDDQ enables minimum-impedance mode instead of calibration.

Is CG7599AA pin-compatible with CY7C1320KV18?

No - CG7C1320KV18 is a 512K × 36 device with different pinout: it uses BWS[3:0], has 36-bit DQ[35:0], requires only 19 address bits, and allocates additional balls for BWS2/BWS3 and extra DQ lines. The 165-ball FBGA footprint is shared, but ball functions differ significantly; direct replacement is not possible without PCB redesign.