Renesas 89HPES12N3AZGBCG8

Overview

89HPES12N3AZGBCG8 from IDT is a 12-lane, 3-port PCI Express® 1.1 switch IC designed for high-throughput server, storage, and networking I/O expansion. It delivers 2.5 Gbps per lane, supports x4 upstream and dual x4 downstream ports, implements cut-through switching with ≤150 ns latency, and integrates twelve embedded SerDes with on-chip packet buffering.

For engineers reviewing the 89HPES12N3AZGBCG8 datasheet, 89HPES12N3AZGBCG8 pinout, 89HPES12N3AZGBCG8 application, or 89HPES12N3AZGBCG8 equivalent, key selection criteria include PCIe 1.1 compliance, configurable link widths (x1/x2/x4), SMBus-configurable operation, integrated RAS features (ECRC, parity protection), and support for Hot-Plug via external I/O expander.

Technical Context

The 89HPES12N3AZGBCG8 implements a layered PCI Express architecture compliant with Base Specification Revision 1.1, including full Transaction, Data Link, and Physical layers with integrated 8B/10B encoding/decoding. Its switch core supports eight traffic classes and one virtual channel with dynamic arbitration and scheduling.

It operates in either store-and-forward or low-latency cut-through mode, uses internal memory for packet buffering and queueing, and enables configuration via dual SMBus interfaces - one slave for register access and one master for EEPROM-based initialization and Hot-Plug control.

Key Specifications

Pinout & Package

Packaged in a 19×19 mm, 324-ball BGA (ball pitch: 1.0 mm) with standard JEDEC footprint. Pin functions are validated per IDT datasheet DSC 6922 (April 2010).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe switch applications.

Compared with 89HPES12N3AZGBCG8, the 89HPES12T3AGI extends operating range without altering functionality, while the 89HPES8T3AGI trades lane count for lower power and footprint - both require design validation but share register-level compatibility for firmware reuse.

Availability

89HPES12N3AZGBCG8 is available at Aetrix Electronics and suitable for enterprise storage backplanes, communications line cards, and server I/O expansion modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 89HPES12N3AZGBCG8 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

IDT (Integrated Device Technology, Inc.) is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions, now part of Renesas Electronics.

The 89HPES12N3AZGBCG8 belongs to IDT's PRECISE™ family of PCI Express switching solutions, engineered specifically for high-bandwidth, low-latency I/O expansion in servers, storage arrays, and networking infrastructure.

FAQ

What PCIe specification version does the 89HPES12N3AZGBCG8 implement?

The 89HPES12N3AZGBCG8 implements PCI Express Base Specification Revision 1.1, supporting 2.5 Gbps per lane, 8B/10B encoding, and full compatibility with Gen1 root complexes and endpoints. It does not support PCIe 2.0 or higher speeds, and its feature set - including max payload size (2048 bytes), traffic classes (8), and virtual channels (1) - aligns precisely with the 1.1 specification.

Does the 89HPES12N3AZGBCG8 require external SerDes or PHY components?

No, the 89HPES12N3AZGBCG8 integrates twelve 2.5 Gbps embedded SerDes with full 8B/10B encoder/decoder functionality, eliminating the need for external transceivers. All PCIe serial I/O is handled internally, reducing bill-of-materials cost, PCB layer count, and signal integrity complexity - a key differentiator versus discrete PHY+switch architectures.

How is configuration loaded into the 89HPES12N3AZGBCG8 at power-on?

The 89HPES12N3AZGBCG8 supports dual configuration methods: (1) via its SMBus master interface, which reads default settings from an external serial EEPROM; and (2) via its SMBus slave interface, allowing runtime register writes from a host processor. The SWMODE[3:0] pins determine boot mode - e.g., 0x1 enables EEPROM initialization, while 0x0 skips it for full software control.

What thermal management is required for the 89HPES12N3AZGBCG8 in a 4/4/4 lane configuration?

In full 4/4/4 lane operation, the 89HPES12N3AZGBCG8 dissipates up to 2.6 W. With 1 m/s airflow and a standard 10-layer PCIe card, its effective θJA is 15.1°C/W, resulting in a junction temperature of ~96°C - well below the 125°C maximum. No heat sink is required under these conditions, per IDT's thermal usage examples in DSC 6922.

Can the 89HPES12N3AZGBCG8 support Hot-Plug without additional logic?

Yes - the 89HPES12N3AZGBCG8 natively supports PCI Express Hot-Plug on both downstream ports using its SMBus master interface to communicate with standard Hot-Plug I/O expanders (e.g., those used on PC/server motherboards). It generates SMBus transactions to update expander outputs and responds to expander interrupts on GPIO pins, requiring no external FPGA or microcontroller.