Renesas 89HT0808PZAABGI

Overview

89HT0808PZAABGI from Integrated Device Technology is an 8-channel PCIe® 3.0 signal retimer IC that conditions high-speed serial links at 8.0 Gbps, 5.0 Gbps, and 2.5 Gbps. It eliminates random and deterministic jitter (including ISI), compensates for PCB trace/cable loss, and resets the jitter budget. It supports x4/x1 link configurations in computing and storage backplanes with CTLE + 5-tap DFE equalization and up to 8 dB transmit de-emphasis.

For engineers reviewing the 89HT0808PZAABGI datasheet, 89HT0808PZAABGI pinout, 89HT0808PZAABGI application, or 89HT0808PZAABGI equivalent, key selection criteria include PCIe Gen 3 compliance, per-lane SerDes configurability (de-emphasis, CTLE, drive strength), L0s/L1 ASPM power management, I²C master/slave interface for EEPROM-based configuration, and IEEE 1149.1/1149.6 JTAG test support.

Technical Context

The 89HT0808PZAABGI implements a full-rate SerDes architecture with independent receive and transmit paths per channel. Its multi-stage equalization includes continuous-time linear equalizer (CTLE) and 5-tap decision feedback equalizer (DFE), enabling robust eye recovery across lossy FR4 traces and passive backplanes.

It uses a 100 MHz differential reference clock and supports both common-clock and non-common-clock PCIe topologies with spread-spectrum clocking (SSCLK). Link training is accelerated by a fast-acquisition PLL optimized for L0s exit, and physical-layer error checking is integrated with end-to-end parity protection on the data path.

Key Specifications

Pinout & Package

Packaged in a 9 mm × 9 mm, 100-ball BGA with 0.8 mm ball pitch (RoHS-compliant, Pb-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 89HT0808PZAABGI, the 89HT0816PZAABGI scales lane count but increases footprint and power, while the PI7C9X2G608BQF trades retimer precision for integrated switching - making 89HT0808PZAABGI optimal for dedicated, high-fidelity PCIe signal regeneration in space- and loss-constrained systems.

Availability

89HT0808PZAABGI is available at Aetrix Electronics and suitable for server backplanes, enterprise SSD expansion chassis, modular storage controllers, and AI accelerator interconnects requiring stable component supply and long-term lifecycle support.

Supply support for 89HT0808PZAABGI 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), now part of Renesas Electronics, designs high-performance timing, memory interface, and signal integrity solutions for data center and communications infrastructure.

The 89HT0808PZAABGI belongs to IDT's PCIe Signal Integrity product line, engineered specifically to extend reach and reliability of Gen 2/3 PCIe links in lossy, thermally variable, and mechanically complex backplane and cable environments.

FAQ

What PCIe generations does the 89HT0808PZAABGI support?

The 89HT0808PZAABGI supports PCIe Base Specification 3.0, 2.1, and 1.1 - operating at 8.0 Gbps (Gen 3), 5.0 Gbps (Gen 2), and 2.5 Gbps (Gen 1). It maintains full protocol transparency and does not terminate or interpret transaction layer packets. All link training, equalization, and power state transitions are handled transparently, preserving native PCIe behavior for upstream and downstream devices.

Does the 89HT0808PZAABGI require external configuration memory?

Yes, the 89HT0808PZAABGI relies on an external I²C EEPROM for boot-time configuration. Its dedicated I²C master interface (SCL_M/SDA_M pins) automatically loads device-specific settings - including per-lane de-emphasis, CTLE coefficients, and link width defaults - before link training begins. The slave interface (SCL/SDA) allows runtime updates and CSR register access by the system controller.

Can the 89HT0808PZAABGI operate in a non-common-clock PCIe topology?

Yes, the 89HT0808PZAABGI supports both common-clock and non-common-clock PCIe configurations. In non-common-clock mode, it uses its internal clock data recovery (CDR) circuitry to extract timing from the incoming data stream, eliminating dependency on a shared reference clock. This enables flexible deployment in mixed-topology systems such as multi-board chassis with independent clock domains.

How does the 89HT0808PZAABGI handle power management states like L0s and L1?

The 89HT0808PZAABGI fully implements PCIe ASPM L0s and L1 states. During L0s, it disables SerDes transmit drivers while maintaining receiver lock; during L1, it gates clocks and powers down analog blocks. Both states retain link configuration and resume within microseconds. The 89HT0808PZAABGI also supports fast L0s exit via its low-latency PLL, meeting sub-1 µs wake-up requirements for latency-sensitive storage workloads.

Is JTAG debugging supported on the 89HT0808PZAABGI, and what standards are implemented?

Yes, the 89HT0808PZAABGI provides full IEEE 1149.1 (standard JTAG) and IEEE 1149.6 (AC-JTAG) support. The TMS, TCK, TDI, and TDO pins enable boundary-scan testing of AC-coupled high-speed lanes, register-level debug access, and SerDes loopback modes. All internal CSR registers - including per-lane diagnostic counters and eye monitor results - are accessible via JTAG or I²C, simplifying bring-up and field failure analysis.