Renesas 89HPES12N3A2ZCBC8

Overview

89HPES12N3A2ZCBC8 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 89HPES12N3A2ZCBC8 datasheet, 89HPES12N3A2ZCBC8 pinout, 89HPES12N3A2ZCBC8 application, or 89HPES12N3A2ZCBC8 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 in 19×19 mm BGA packages.

Technical Context

The 89HPES12N3A2ZCBC8 implements a layered PCI Express switch core with separate Transaction, Data Link, and Physical layers compliant with Base Specification Revision 1.1. It supports eight traffic classes and one virtual channel, with internal frame buffering and route table arbitration for deterministic latency.

Its dual SMBus interface enables both slave-mode register access and master-mode configuration loading from serial EEPROM; GPIO[0–7] provide flexible I/O control including port reset outputs (P2RSTN/P4RSTN) and Hot-Plug interrupt inputs (IOEXPINTN0/IOEXPINTN2).

Key Specifications

Pinout & Package

Package: 324-ball BGA, 19 mm × 19 mm, 1.0 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 89HPES12N3A2ZCBC8, the 89HPES12T3AG2ZBBC offers extended temperature operation and higher ESD robustness at identical functionality, while the 89HPES8T3AG2ZBBC trades 4 lanes for lower power and cost - enabling tiered product families without redesigning PCB layout or firmware.

Availability

89HPES12N3A2ZCBC8 is available at Aetrix Electronics and suitable for server I/O expansion, enterprise storage interconnect, and communications chassis backplane applications requiring stable component supply across multi-year production cycles.

Supply support for 89HPES12N3A2ZCBC8 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 PRECISE™ family - including the 89HPES12N3A2ZCBC8 - was designed specifically for high-reliability, low-latency PCI Express switching in data center and telecom infrastructure, emphasizing RAS features, thermal efficiency, and seamless integration with legacy BIOS and OS drivers.

FAQ

What PCIe specification revision does the 89HPES12N3A2ZCBC8 implement?

The 89HPES12N3A2ZCBC8 implements PCI Express Base Specification Revision 1.1. It supports 2.5 Gbps per lane, 8B/10B encoding, and all mandatory features including Advanced Error Reporting and ECRC. It does not support PCIe 2.0 or later revisions, and its maximum payload size is limited to 2048 bytes per TLP. The 89HPES12N3A2ZCBC8 remains fully interoperable with Gen1 root complexes and endpoints in production server and storage platforms.

Does the 89HPES12N3A2ZCBC8 require external SerDes or transceivers?

No, the 89HPES12N3A2ZCBC8 integrates twelve 2.5 Gbps embedded SerDes with full 8B/10B encoder/decoder functionality - eliminating the need for external transceivers. All PCIe electrical signaling (TX/RX differential pairs, reference clock interface, and termination) is handled internally. This integration reduces bill-of-materials cost, PCB layer count, and layout complexity compared to discrete PHY+switch solutions.

How is Hot-Plug functionality implemented on the 89HPES12N3A2ZCBC8?

The 89HPES12N3A2ZCBC8 implements Hot-Plug via its master SMBus interface, which communicates with standard external I/O expanders (e.g., TI TPS2359) rather than using dedicated Hot-Plug pins. Upon detecting a slot insertion/removal event, the expander asserts an interrupt on GPIO[2] or GPIO[4], and the 89HPES12N3A2ZCBC8 responds by issuing SMBus commands to update power and presence status. This architecture reuses existing motherboard infrastructure and avoids adding dedicated Hot-Plug ASIC logic.

What are the power-up sequencing requirements for the 89HPES12N3A2ZCBC8?

The 89HPES12N3A2ZCBC8 requires strict power-up sequencing: (1) VDDIO (3.3 V) first, (2) then VDDCORE, VDDPE, and VDDAPE (all 1.0 V), and (3) finally VTTPE (1.5 V). Each rail must ramp and stabilize before the next is applied to prevent latch-up. Power-down must follow the reverse order. Deviation from this sequence risks functional failure or permanent damage. The 89HPES12N3A2ZCBC8 does not include internal power sequencing circuitry - external supervisors or sequencers are required.

Can the 89HPES12N3A2ZCBC8 operate in store-and-forward mode?

Yes, the 89HPES12N3A2ZCBC8 supports both cut-through and store-and-forward switching modes. Cut-through is the default and lowest-latency mode, forwarding packets as soon as header routing information is available. Store-and-forward mode buffers entire packets before forwarding - used when end-to-end CRC checking or deep packet inspection is required. Mode selection is controlled via configuration registers accessible through the slave SMBus interface or serial EEPROM.