Renesas 89H48H12G3YCHLI8

Overview

89H48H12G3 from IDT is a 48-lane, 12-port PCI Express Gen3 system interconnect switch with non-blocking architecture, 8.0 GT/s SerDes per lane, 96 GBps full-duplex switching capacity, and support for x8/x4/x2/x1 port configurations in enterprise server and SSD storage array applications.

For engineers reviewing the 89H48H12G3 datasheet, 89H48H12G3 pinout, 89H48H12G3 application, or 89H48H12G3 equivalent, key selection criteria include PCIe Gen3 compliance, 12-port partitioning capability, SECDED ECC on internal RAMs, AER on all ports, and FCBGA-676 package thermal and routing constraints.

Technical Context

The 89H48H12G3 implements a cut-through switching core with integrated DL/Transaction Layer across all 12 ports, supporting simultaneous peer-to-peer traffic flows and dynamic reconfiguration of up to 12 independent switch partitions. It delivers deterministic latency under 150 ns for 2 KB TLPs and supports per-lane SerDes configuration including lane reversal and autonomous link width negotiation.

It complies fully with PCI Express Base Specification 3.0 and implements optional features including Advanced Error Reporting (AER), Access Control Services (ACS), Atomic Operations, Latency Tolerance Reporting (LTR), and Optimized Buffer Flush/Fill (OBFF) - all verified per-port in hardware.

Key Specifications

Pinout & Package

Packaged in a 27 mm × 27 mm 676-ball Flip-Chip Ball Grid Array (FCBGA) with 0.8 mm ball pitch, designed for high-density server PCB layouts requiring controlled impedance routing and thermal management via bottom-side thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe Gen3 switch applications.

Compared with MPF24G3-12 and PEX8748, the 89H48H12G3 uniquely combines 12-port partitioning, SECDED ECC, and cut-through latency under 150 ns - making it optimal for enterprise servers requiring both RAS rigor and deterministic I/O scheduling.

Availability

89H48H12G3 is available at Aetrix Electronics and suitable for enterprise server I/O expansion, SSD storage array interconnect, intelligent I/O module design, and communications equipment backplane applications requiring stable component supply and long-term lifecycle support.

Supply support for 89H48H12G3 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

Integrated Device Technology (IDT) is a fabless semiconductor company specializing in high-performance timing, memory interface, RF, and interconnect solutions for datacenter, communications, and industrial markets.

The 89H48H12G3 belongs to IDT's PCIe Switch family, engineered specifically for Gen3 system interconnect in multi-root, high-RAS server and storage platforms demanding low latency, partition flexibility, and robust error containment.

FAQ

What is the maximum payload size supported by the 89H48H12G3?

The 89H48H12G3 supports a maximum TLP payload size of 2 KB, as defined in the PCI Express Base Specification 3.0. This value is fixed in hardware and cannot be extended beyond 2048 bytes. The switch processes all TLPs within this limit using its cut-through architecture, ensuring consistent latency regardless of payload length. All internal buffers and routing logic are validated for 2 KB operation across all 12 ports.

Does the 89H48H12G3 support hot-plug on all downstream ports?

Yes, the 89H48H12G3 supports hot-plug on all 12 downstream switch ports via dedicated PERST#_n signals and AER-compliant event reporting. Each port independently detects link state changes and generates MSI or INTx interrupts upon insertion or removal. The device maintains full link training and configuration recovery without requiring system-level reset or switch firmware reload.

What reference clock configurations does the 89H48H12G3 support?

The 89H48H12G3 supports four differential REFCLK_P/N pairs (REFCLK_0 through REFCLK_3), allowing flexible global or local reference topologies. Clock sources may be shared across multiple ports or assigned individually. The device accepts 100 MHz differential input and performs internal clock multiplication to generate SerDes PLL references. Configuration is handled via SMBus, EEPROM, or pin strapping.

How many general-purpose I/O pins does the 89H48H12G3 provide?

The 89H48H12G3 provides nine general-purpose I/O pins (GPI[0:8]), each configurable as input, output, or bidirectional under software control. These pins support strap configuration during initialization, real-time status monitoring (e.g., link activity), and debug signaling. They are electrically compatible with 1.05 V I/O standards and include internal pull-up/down resistors programmable via configuration space.

Is the 89H48H12G3 compliant with PCI Express Base Specification 3.0?

Yes, the 89H48H12G3 is fully compliant with PCI Express Base Specification 3.0, including mandatory features such as 8.0 GT/s operation, LTSSM states, and transaction layer protocols. It also implements all listed optional features: AER, ACS, ARI, IER, Atomic Operations, TPH, LTR, and OBFF - each verified per-port in silicon and documented in the official IDT 89H48H12G3 datasheet.