Renesas 89HPES12N3A2ZCBC

Overview

89HPES12N3A2ZCBC from IDT is a 12-lane, 3-port PCI Express® 1.1 switch IC with x4 upstream and dual x4 downstream ports, 2.5 Gbps per lane, cut-through architecture, and integrated 12× SerDes with 8B/10B encoding - deployed in server I/O expansion, storage interconnects, and communications chassis.

For engineers reviewing the 89HPES12N3A2ZCBC datasheet, 89HPES12N3A2ZCBC pinout, 89HPES12N3A2ZCBC application, or 89HPES12N3A2ZCBC equivalent, key selection criteria include PCIe 1.1 compliance, configurable link widths (x1/x2/x4), SMBus-configurable operation, RAS features (ECRC, parity-protected TLPs), and thermal performance in 19×19 mm BGA packaging.

Technical Context

The 89HPES12N3A2ZCBC implements a layered PCI Express switch architecture compliant with Base Specification Revision 1.1, integrating SerDes, Physical, Data Link, and Transaction layers across three ports. It supports store-and-forward or low-latency cut-through forwarding, eight traffic classes, and one virtual channel for QoS-aware routing.

Configuration is managed via dual SMBus interfaces: a slave interface for runtime register access and a master interface for EEPROM-based initialization and Hot-Plug I/O expander control. All twelve PCIe lanes support automatic lane reversal, polarity inversion, and per-port link width negotiation.

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 include three differential PCIe ports (Port 0 upstream, Ports 2 & 4 downstream), dual SMBus interfaces (master/slave), eight GPIOs with alternate functions (e.g., P2RSTN, IOEXPINTN0), JTAG test access, and dedicated power/ground 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 89HPES12N3A2ZCBC, the ZBBC variant offers identical functionality with enhanced manufacturability, while the 8-lane 89HPES8T3AG2ZBBC trades bandwidth for reduced power and board area - enabling tiered platform design without architectural redesign.

Availability

89HPES12N3A2ZCBC is available at Aetrix Electronics and suitable for server motherboard design, enterprise storage controller development, and communications chassis integration requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 89HPES12N3A2ZCBC 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 89HPES12N3A2ZCBC belongs to IDT's PRECISE™ family of PCI Express switching solutions, engineered specifically for high-throughput, low-latency I/O expansion in servers, storage systems, and networking infrastructure.

FAQ

What PCIe specification revision does the 89HPES12N3A2ZCBC implement?

The 89HPES12N3A2ZCBC implements PCI Express Base Specification Revision 1.1, supporting 2.5 Gbps per lane, 8B/10B encoding, and full compliance with transaction, data link, and physical layer requirements. It does not support PCIe 2.0 or later generations, and its maximum payload size is limited to 2048 bytes per TLP.

Does the 89HPES12N3A2ZCBC require external configuration memory?

The 89HPES12N3A2ZCBC can operate without external configuration memory when configured in Normal Switch Mode (SWMODE = 0x0). However, for EEPROM-based initialization-including SMBus address setup, Hot-Plug settings, and default register values-the device uses its master SMBus interface to load configuration from an external serial EEPROM, which is optional but recommended for production systems.

How many PCIe lanes does the 89HPES12N3A2ZCBC support, and how are they allocated?

The 89HPES12N3A2ZCBC supports 12 PCIe lanes total, allocated across three ports: Port 0 (upstream, x4 capable), Port 2 (downstream, x4 capable), and Port 4 (downstream, x4 capable). Lane allocation is fixed per port; the device does not support dynamic lane redistribution (e.g., x8+x4) - only per-port x1/x2/x4 negotiation.

What thermal management is required for the 89HPES12N3A2ZCBC in a 70°C ambient environment?

In a 70°C ambient environment with 1 m/s airflow, the 89HPES12N3A2ZCBC achieves a calculated junction temperature of 96°C (below the 125°C maximum), confirming no heat sink is required. Its effective θJA is 15.1°C/W under that airflow condition, and thermal reliability is maintained using standard 4+ layer PCB layout with adequate copper pour around VDD/VSS balls.

Can the 89HPES12N3A2ZCBC support Hot-Plug functionality without external components?

The 89HPES12N3A2ZCBC supports PCIe Hot-Plug natively but requires an external SMBus-connected I/O expander (e.g., TI TPS2384 or compatible) to drive slot presence detect, power enable, and LED signals. The device itself provides interrupt inputs (IOEXPINTN0/2) and SMBus master outputs to coordinate with the expander - no direct Hot-Plug pinout exists on the 89HPES12N3A2ZCBC package.