Renesas 89HPES12N3AZGBC8

Overview

89HPES12N3AZGBC8 from IDT is a 12-lane, 3-port PCI Express 1.1 switch IC designed for high-throughput I/O expansion in servers and storage systems. It delivers 2.5 Gbps per lane, supports x4 upstream and dual x4 downstream ports, implements cut-through switching with ≤100 ns latency, and integrates twelve embedded SerDes with on-chip packet buffering.

For engineers reviewing the 89HPES12N3AZGBC8 datasheet, 89HPES12N3AZGBC8 pinout, 89HPES12N3AZGBC8 application, or 89HPES12N3AZGBC8 equivalent, key selection criteria include PCIe 1.1 compliance, 3-port topology with configurable link widths (x1/x2/x4), SMBus-configurable operation, integrated RAS features (ECRC, hot-plug support), and thermal performance in 19×19 mm BGA packaging.

Technical Context

The 89HPES12N3AZGBC8 implements a layered PCI Express architecture compliant with Base Specification Revision 1.1, integrating SerDes, Physical, Data Link, and Transaction layers across all 12 lanes. Its switch core supports eight traffic classes and one virtual channel with resource management for memory and I/O transactions.

It operates in either store-and-forward or low-latency cut-through mode, supports automatic lane reversal and polarity inversion on all ports, and loads configuration from serial EEPROM via its master SMBus interface. The device includes dual SMBus interfaces (master and slave), eight GPIOs with interrupt capability, and JTAG boundary-scan test support.

Key Specifications

Pinout & Package

Packaged in a 19×19 mm, 324-ball fine-pitch BGA (ball pitch 1.0 mm) with standard JEDEC footprint. Pin functions are validated per IDT datasheet DSC 6922 (April 2010), including differential PCIe lanes, dual SMBus interfaces, eight GPIOs, JTAG, reset, reference clock, and multi-rail power/ground distribution.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 89HPES12N3AZGBC8, the 89HPES12N3AGBC offers identical switching performance but requires Pb-handling controls, while the 89HPES12N3AZBBC trades package size and pin count for reduced routing complexity - neither is pin-compatible, and both require layout revision.

Availability

89HPES12N3AZGBC8 is available at Aetrix Electronics and suitable for enterprise storage backplanes, server I/O expansion modules, communications blade switching, and industrial embedded computing requiring stable component supply and long-term lifecycle assurance.

Supply support for 89HPES12N3AZGBC8 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 interconnect solutions, acquired by Renesas Electronics in 2019.

The 89HPES12N3AZGBC8 belongs to IDT's PRECISE™ family of PCIe switching solutions, engineered specifically for high-reliability, low-latency I/O expansion in datacenter and telecom infrastructure where RAS, thermal efficiency, and configuration flexibility are critical.

FAQ

What PCIe specification version does the 89HPES12N3AZGBC8 implement?

The 89HPES12N3AZGBC8 implements PCI Express Base Specification Revision 1.1 exclusively. It supports 2.5 Gbps per lane, 8B/10B encoding, and all mandatory features of Gen 1, including ECRC, Advanced Error Reporting, and Native Hot-Plug. It does not support Gen 2 (5.0 Gbps) or later revisions.

Does the 89HPES12N3AZGBC8 require external configuration memory?

No - the 89HPES12N3AZGBC8 integrates dual SMBus interfaces to load configuration from an external serial EEPROM via its master SMBus. However, the EEPROM itself is external; the device contains no non-volatile memory. The slave SMBus allows runtime register access without EEPROM dependency.

How many PCIe lanes does the 89HPES12N3AZGBC8 support, and how are they allocated?

The 89HPES12N3AZGBC8 supports exactly 12 PCIe lanes, allocated as one x4 upstream port (Port 0) and two x4 downstream ports (Ports 2 and 4). Lane width is auto-negotiated per port and can be configured down to x1, but total lane count remains fixed at 12.

What thermal management is required for the 89HPES12N3AZGBC8 in a 70°C ambient environment?

In a 70°C ambient environment with 1 m/s airflow, the 89HPES12N3AZGBC8 achieves a junction temperature of ~96°C (below its 125°C maximum), so no heatsink is required. Thermal resistance is θJA(eff) = 15.1°C/W under that airflow condition, and the device is rated for commercial temperature range (0°C to +70°C).

Can the 89HPES12N3AZGBC8 support peer-to-peer traffic between downstream ports?

Yes - the 89HPES12N3AZGBC8 explicitly supports switching between its two downstream ports (Port 2 and Port 4). This enables direct peer-to-peer DMA transfers without involving the upstream root complex, reducing latency and host CPU overhead in multi-node architectures.