Renesas 89HPES12N3A2ZCBCGI

Overview

89HPES12N3A2ZCBCGI from IDT is a 12-lane, 3-port PCI Express 1.1 switch IC with x4 upstream and two x4 downstream ports, 2.5 Gbps per lane, cut-through architecture, and integrated 8B/10B SerDes - deployed in server I/O expansion, storage interconnects, and communications chassis.

For engineers reviewing the 89HPES12N3A2ZCBCGI datasheet, 89HPES12N3A2ZCBCGI pinout, 89HPES12N3A2ZCBCGI application, or 89HPES12N3A2ZCBCGI equivalent, key selection considerations include PCIe 1.1 compliance, configurable link widths (x1/x2/x4), SMBus-configurable operation, Hot-Plug support via external expander, and thermal performance at 2.6 W max power dissipation.

Technical Context

The 89HPES12N3A2ZCBCGI implements a layered PCI Express switch architecture compliant with Base Specification Revision 1.1, integrating SerDes, Physical, Data Link, and Transaction layers. It supports store-and-forward or cut-through forwarding modes, eight traffic classes, and one virtual channel for QoS-aware packet routing between upstream and two downstream ports.

Its dual SMBus interface enables both slave-mode register access and master-mode configuration loading from serial EEPROM, while GPIO[0–7] provide flexible I/O control including port reset outputs (P2RSTN/P4RSTN) and I/O expander interrupt inputs (IOEXPINTN0/IOEXPINTN2), all managed without external components.

Key Specifications

Pinout & Package

Packaged in 19×19 mm, 324-ball BGA (BCG324) with 1.0 mm ball pitch. Pinout includes three differential PCIe port interfaces (PE0/PE2/PE4), dual SMBus (master/slave), eight GPIOs with alternate functions, JTAG test interface, and dedicated power domains (VDDCORE, VDDIO, VDDPE, VDDAPE, VTTPE).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 89HPES12N3A2ZCBCGI, the 89HPES12N3AGI offers identical functionality in RoHS-compliant packaging, while the 89HPES12T3A2ZCBCGI extends operational range at the cost of higher thermal resistance - making the original part optimal for cost-sensitive, thermally controlled server and storage environments.

Availability

89HPES12N3A2ZCBCGI is available at Aetrix Electronics and suitable for server I/O expansion, enterprise storage interconnect, and communications chassis backplane applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 89HPES12N3A2ZCBCGI 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, acquired by Renesas Electronics in 2019.

The 89HPES12N3A2ZCBCGI belongs to IDT's PRECISE™ family of PCI Express switching solutions, designed specifically for high-throughput, low-latency I/O consolidation in servers, storage systems, and networking infrastructure.

FAQ

What PCIe specification revision does the 89HPES12N3A2ZCBCGI implement?

The 89HPES12N3A2ZCBCGI implements PCI Express Base Specification Revision 1.1, supporting 2.5 Gbps per lane, 8B/10B encoding, and features including Advanced Error Reporting, ECRC, and native Hot-Plug. It does not support PCIe 2.0 or later generations, and its maximum payload size is limited to 2048 bytes per TLP as defined in Rev 1.1.

Does the 89HPES12N3A2ZCBCGI require external SerDes or transceivers?

No, the 89HPES12N3A2ZCBCGI integrates twelve 2.5 Gbps embedded SerDes with full 8B/10B encoder/decoder functionality, eliminating the need for external transceivers. All PCIe physical layer functions - including clock recovery, serialization/deserialization, and impedance matching - are handled on-die, reducing BOM count and PCB layer count.

How is Hot-Plug functionality implemented on the 89HPES12N3A2ZCBCGI?

The 89HPES12N3A2ZCBCGI implements Hot-Plug via its SMBus master interface, which communicates with standard I/O expanders (e.g., those used on PC/server motherboards). It generates SMBus transactions to update Hot-Plug output states and reads input states upon interrupt assertion on GPIO pins like IOEXPINTN0 - enabling safe, software-coordinated module insertion and removal.

What are the power supply requirements for the 89HPES12N3A2ZCBCGI?

The 89HPES12N3A2ZCBCGI requires five independent supplies: VDDCORE (1.0 V ±10%), VDDIO (3.3 V ±10%), VDDPE (1.0 V ±10%), VDDAPE (1.0 V ±10%), and VTTPE (1.5 V ±5%). Power-up sequence must be strictly followed: VDDIO first, then VDDCORE/VDDPE/VDDAPE, then VTTPE - to prevent latch-up and ensure reliable initialization.

Can the 89HPES12N3A2ZCBCGI operate in cut-through and store-and-forward modes?

Yes, the 89HPES12N3A2ZCBCGI supports both cut-through and store-and-forward switching modes. Cut-through minimizes latency (<100 ns for memory reads) by forwarding packets before full reception, while store-and-forward validates CRC before forwarding - selectable per-port via configuration registers accessible through the slave SMBus interface.