Renesas 89HT0808PYAAB8

Overview

89HT0808PYAAB8 from Integrated Device Technology is a PCIe 3.0-compliant 8-channel signal retimer IC that conditions high-speed serial links by eliminating random and deterministic jitter, compensating for PCB trace/cable loss, and resetting the jitter budget. It supports 8.0 Gbps, 5.0 Gbps, and 2.5 Gbps data rates across up to four full PCIe lanes in server backplane and long-trace slot applications.

For engineers reviewing the 89HT0808PYAAB8 datasheet, 89HT0808PYAAB8 pinout, 89HT0808PYAAB8 application, or 89HT0808PYAAB8 equivalent, key selection criteria include PCIe Gen 3/2/1 compliance, per-lane CTLE+5-tap DFE equalization, 8 dB transmit de-emphasis, L0s/L1 ASPM power management, and I²C-configurable SerDes settings.

Technical Context

The 89HT0808PYAAB8 implements a full-rate SerDes architecture with independent receive and transmit paths per channel. Its multi-stage equalization includes continuous-time linear equalization (CTLE) and a 5-tap decision feedback equalizer (DFE), enabling robust eye opening on lossy FR4 traces exceeding 30 inches.

It integrates a fast-acquisition PLL optimized for PCIe L0s exit timing, supports both common- and non-common clock topologies with 100 MHz reference input, and provides dual I²C interfaces - master for EEPROM boot loading and slave for runtime CSR access and firmware updates.

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 89HT0808PYAAB8, the 89HT0816P offers double lane capacity in identical packaging for scalable backplane designs, while the PI7C9X2G608GP trades Gen 3 jitter removal for integrated switching - making it viable only in legacy Gen 2 systems where full retiming is not critical.

Availability

89HT0808PYAAB8 is available at Aetrix Electronics and suitable for server backplane interconnect, enterprise storage expansion, workstation PCIe slot extension, and communications equipment line cards requiring stable component supply and long-term lifecycle support.

Supply support for 89HT0808PYAAB8 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions.

The 89HT0808PYAAB8 belongs to IDT's PCIe Signal Integrity product line, designed specifically to solve signal degradation challenges in high-speed computing and storage infrastructure with minimal latency and deterministic jitter reset.

FAQ

What PCIe generations does the 89HT0808PYAAB8 support?

The 89HT0808PYAAB8 supports PCIe Base Specification 3.0, 2.1, and 1.1 - operating natively at 8.0 Gbps (Gen 3), 5.0 Gbps (Gen 2), and 2.5 Gbps (Gen 1). It performs full jitter cleanup and equalization at all three rates, maintaining compliance with each generation's electrical specifications including transmitter mask and receiver sensitivity requirements. The 89HT0808PYAAB8 achieves this through rate-adaptive CTLE and DFE calibration during link training.

Does the 89HT0808PYAAB8 require an external EEPROM for configuration?

Yes, the 89HT0808PYAAB8 uses an external I²C EEPROM for initial configuration loading via its dedicated master I²C interface (SCL_M/SDA_M). This EEPROM stores boot-time SerDes parameters, equalization settings, and power management policies. However, runtime reconfiguration is possible through the slave I²C interface (SCL_S/SDA_S), allowing the host system to modify registers or update firmware without EEPROM dependency. The 89HT0808PYAAB8 validates EEPROM content with hardware CRC-16 before execution.

Can the 89HT0808PYAAB8 operate in a non-common clock PCIe topology?

Yes, the 89HT0808PYAAB8 supports both common-clock and non-common-clock PCIe configurations. It accepts a single 100 MHz differential reference clock (REFCLK_P/N) and internally generates lane-specific clocks using its fast-acquisition PLLs. In non-common-clock mode, it tolerates ±300 ppm frequency offset between reference clock and link partner - meeting PCIe 3.0 specification requirements for independent clocking domains. This capability is confirmed in the official IDT 89HT0808P Product Brief Rev. 1.0.

What power-saving features does the 89HT0808PYAAB8 implement for PCIe ASPM?

The 89HT0808PYAAB8 fully supports PCIe Active State Power Management (ASPM) L0s and L1 states. During L0s, it disables SerDes transmit drivers and enters low-power receive monitoring mode. In L1, unused lanes automatically transition to deep-sleep mode, cutting power by >70% per idle lane. It also supports half-swing SerDes operation to reduce dynamic power. These features are enabled via PCIe configuration space writes and require no external control logic - all managed internally by the 89HT0808PYAAB8's link state machine.

Is JTAG debugging supported on the 89HT0808PYAAB8?

Yes, the 89HT0808PYAAB8 supports IEEE 1149.1 (standard JTAG) and IEEE 1149.6 (AC-JTAG) for boundary-scan and high-speed interconnect testing. All internal registers, including per-lane diagnostic counters and SerDes test modes, are accessible via JTAG TAP controller. The device includes dedicated TCK, TMS, TDI, TDO, and TRST# pins, and supports loopback modes for physical layer validation. JTAG functionality is documented in Section 5.4 of the IDT 89HT0808P Register Reference Manual.