Renesas 89HPES16T4AG2ALG8

Overview

89HPES16T4AG2ALG8 from IDT is a 16-lane, 4-port PCI Express Gen2 switch IC designed for high-throughput server, storage, and networking systems. It delivers 128 Gbps full-duplex switching capacity, supports cut-through architecture with ≤150 ns latency, complies with PCIe Base Specification 2.0, and integrates 16 embedded 5 Gbps SerDes with on-chip packet buffering.

For engineers reviewing the 89HPES16T4AG2ALG8 datasheet, 89HPES16T4AG2ALG8 pinout, 89HPES16T4AG2ALG8 application, or 89HPES16T4AG2ALG8 equivalent, key selection criteria include upstream/downstream port configuration (x8/x4 or x4×4), SMBus master/slave interface support (0x50/0x77 addresses), Hot-Plug I/O expander integration, RAS features (SECDED ECC, ECRC, end-to-end parity), and 19 mm × 19 mm Flip Chip BGA324 packaging.

Technical Context

The 89HPES16T4AG2ALG8 implements a layered PCIe 2.0-compliant architecture with independent Transaction, Data Link, and Physical layers per port. Its cut-through switch core enables sub-150 ns forwarding latency while supporting eight traffic classes and one virtual channel for QoS-aware routing in multi-host environments.

It embeds sixteen 5 Gbps SerDes with integrated 8b/10b encoding/decoding, receive equalization (RxEQ), and automatic lane reversal/polarity inversion. Power management includes dynamic SerDes shutdown, PCI-PM 2.0 and ACPI 2.0 compliance, and configurable link state control via SWMODE[2:0] pins.

Key Specifications

Pinout & Package

89HPES16T4AG2ALG8 is packaged in a 19 mm × 19 mm, 324-ball Flip Chip BGA with 1.0 mm ball pitch. The package supports standard thermal and mechanical handling for high-reliability server applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe Gen2 switching applications.

Compared with 89HPES16T4AG2ALG8, the 89HPES16T4AG2ZBALG8 offers identical electrical and functional performance with extended thermal qualification, while the 89HPES12T3AG2ALG8 trades one downstream port and related control logic for lower power (2.64 W max vs. 2.87 W) and reduced BGA footprint utilization.

Availability

89HPES16T4AG2ALG8 is available at Aetrix Electronics and suitable for server I/O expansion, enterprise storage controller design, and communications router line card development requiring stable component supply, long lifecycle support, and traceable sourcing.

Supply support for 89HPES16T4AG2ALG8 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 high-performance timing, memory interface, RF, and PCIe connectivity solutions for datacenter and communications infrastructure.

The 89HPES16T4AG2ALG8 belongs to IDT's PRECISE™ family of PCIe switching solutions, engineered specifically for low-latency, high-reliability fan-out in servers, storage arrays, and networking equipment.

FAQ

What is the maximum PCIe link width supported by the 89HPES16T4AG2ALG8 upstream port?

The 89HPES16T4AG2ALG8 upstream port supports configurable x8 or x4 link width via hardware pin P01MERGEN. When P01MERGEN is asserted low, Port 0 and Port 1 merge to form a single x8 upstream link; when high, Port 0 operates as an independent x4 upstream port. This flexibility allows optimization for either bandwidth density or port count in server and storage applications.

Does the 89HPES16T4AG2ALG8 support PCIe Gen3 signaling?

No, the 89HPES16T4AG2ALG8 is strictly a PCIe Gen2 device, supporting 5 Gbps per lane with 8b/10b encoding. It does not implement Gen3 features such as 128b/130b encoding, transmitter de-emphasis beyond −6.0 dB, or 8 GT/s data rates. Systems requiring Gen3 must use a different switch IC, such as IDT's 89HPES24T6AG3 series.

How is Hot-Plug functionality implemented on the 89HPES16T4AG2ALG8?

The 89HPES16T4AG2ALG8 implements Hot-Plug per downstream port using its master SMBus interface (address 0x50) to communicate with an external I/O expander. On Hot-Plug event detection, it asserts IOEXPINTN (via GPIO[2]) and issues SMBus transactions to read status or update output states - eliminating dedicated Hot-Plug controller ICs and reducing system complexity.

What are the power supply sequencing requirements for the 89HPES16T4AG2ALG8?

The 89HPES16T4AG2ALG8 requires VDDCORE to remain at least 1.0 V below VDDI/O during power-up ramp; no other sequencing constraints apply. During power-down, supplies may be removed in any order. Violating the VDDCORE/VDDI/O relationship risks latch-up or initialization failure, particularly during cold-start conditions in server BIOS environments.

Can the 89HPES16T4AG2ALG8 operate with a single 100 MHz reference clock source?

Yes, the 89HPES16T4AG2ALG8 accepts a single differential 100 MHz reference clock (PEREFCLKP/PEREFCLKN) which feeds on-chip PLLs to generate all required internal clocks for SerDes and logic domains. This eliminates the need for multiple clock generators and simplifies clock tree design in dense server and storage boards.