Renesas 89HPES12N3A2ZCBCI

Overview

89HPES12N3A2ZCBCI 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 8B/10B SerDes - deployed in server I/O expansion, storage backplanes, and communications chassis for low-latency packet routing between CPU and peripherals.

For engineers reviewing the 89HPES12N3A2ZCBCI datasheet, 89HPES12N3A2ZCBCI pinout, 89HPES12N3A2ZCBCI application, or 89HPES12N3A2ZCBCI equivalent, this page delivers verified technical context, exact pin roles, PCIe 1.1 compliance details, SMBus configuration interfaces, GPIO alternate functions, and thermal/power data specific to the 324-ball BGA (19×19 mm) commercial-grade variant.

Technical Context

The 89HPES12N3A2ZCBCI implements a layered PCI Express Base Specification Revision 1.1-compliant architecture with independent Transaction, Data Link, and Physical layers per port. It supports store-and-forward or cut-through switching modes, eight traffic classes, one virtual channel, and end-to-end parity protection on all TLPs - enabling deterministic latency and data integrity in multi-tenant server environments.

Its dual SMBus interfaces (master and slave) enable both external EEPROM-based configuration loading and real-time register access, while Hot-Plug I/O expander support via GPIO[2] and GPIO[4] interrupt inputs allows seamless PCIe hot-swap implementation without dedicated controller logic.

Key Specifications

Pinout & Package

Packaged in 19×19 mm, 324-ball BGA (ball pitch 1.0 mm), RoHS-compliant, with thermal pad exposed on underside for board-level heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 89HPES12N3A2ZACBI, the 89HPES12N3A2ZCBCI offers identical functionality at lower cost and reduced thermal load but lacks extended temperature qualification; versus 89HPES8N3A2ZCBCI, it delivers 50% more aggregate bandwidth and higher per-port lane count - critical for multi-NIC or multi-SSD server configurations.

Availability

89HPES12N3A2ZCBCI is available at Aetrix Electronics and suitable for server I/O expansion, enterprise storage backplanes, and communications chassis requiring stable component supply, long-term lifecycle management, and traceable sourcing for production programs.

Supply support for 89HPES12N3A2ZCBCI 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 PCIe connectivity solutions for datacenter, communications, and industrial markets.

The 89HPES12N3A2ZCBCI belongs to IDT's PRECISE™ family of PCIe switching solutions - engineered specifically for high-throughput, low-latency I/O consolidation in servers, storage arrays, and networking equipment.

FAQ

What PCIe specification revision does the 89HPES12N3A2ZCBCI implement?

The 89HPES12N3A2ZCBCI implements PCI Express Base Specification Revision 1.1, supporting 2.5 Gbps per lane, 8B/10B encoding, and full backward compatibility with PCIe 1.0a devices. It does not support Gen 2 (5.0 Gbps) or later revisions, and its configuration space, TLP formats, and power management states align strictly with Rev 1.1 requirements.

Does the 89HPES12N3A2ZCBCI require external SerDes or clock buffers?

No, the 89HPES12N3A2ZCBCI integrates twelve 2.5 Gbps embedded SerDes with on-die 8B/10B encoder/decoder and PLL-based clock generation - eliminating need for external transceivers. A single differential reference clock (100 or 125 MHz) fed to PEREFCLKP/PEREFCLKN suffices; no additional clock buffers are required for PCIe link operation.

How is Hot-Plug functionality implemented on the 89HPES12N3A2ZCBCI?

Hot-Plug is implemented via SMBus-managed external I/O expanders: GPIO[2] and GPIO[4] serve as interrupt inputs (IOEXPINTN0/IOEXPINTN2) from the expander, while the master SMBus (MSMBCLK/MSMBDAT) writes updated Hot-Plug output states to the expander. This offloads hot-swap logic from the switch and reuses standard motherboard I/O expander ICs.

What is the power-up sequence requirement for the 89HPES12N3A2ZCBCI?

The 89HPES12N3A2ZCBCI requires strict power sequencing: (1) VDDIO (3.3 V) must ramp and stabilize first; (2) then VDDCORE, VDDPE, and VDDAPE (all 1.0 V) simultaneously; (3) finally VTTPE (1.5 V). Violating this order risks internal latch-up. Power-down must follow reverse sequence, and no maximum ramp time limits apply if voltages meet min/max tolerances in Table 13.

Can the 89HPES12N3A2ZCBCI operate without a heatsink?

Yes - the 89HPES12N3A2ZCBCI dissipates ≤2.6 W maximum and has θJA(eff) = 21.8 °C/W (no airflow). On a standard 4-layer or greater PCIe card with ≥1 m/s airflow, junction temperature remains ≤96°C at 70°C ambient - well below the 125°C limit. Heatsinks are only needed in zero-airflow, high-ambient (>70°C), or ultra-dense board layouts.