Texas Instruments DS110RT410SQ/NOPB

Overview

DS110RT410SQ/NOPB from Texas Instruments is a quad-channel retimer IC designed for high-speed serial link signal integrity restoration in backplane and optical module interfaces. It supports independent per-channel data rates from 8.5 to 11.3 Gbps, delivers ≤300 ps propagation delay, provides up to 34-dB adaptive CTLE equalization at 5 GHz, and operates from a single 2.5-V ±5% supply. It is used in SFP+ (SFF-8431) optical transceivers and mid-plane interconnects requiring BER < 1×10⁻¹⁵.

For engineers reviewing the DS110RT410SQ/NOPB datasheet, DS110RT410SQ/NOPB pinout, DS110RT410SQ/NOPB application, or DS110RT410SQ/NOPB equivalent, key selection considerations include multi-rate CDR lock capability, integrated CTLE+CDR+DE architecture (no DFE), subrate support (÷2/4/8), 2.5-V operation, and WQFN-48 package compatibility with TI's retimer family pin mapping.

Technical Context

The DS110RT410SQ/NOPB implements a four-channel, fully independent retiming path per channel comprising adaptive Continuous-Time Linear Equalizer (CTLE), Clock and Data Recovery (CDR), and programmable De-Emphasis (DE) driver - but excludes Decision Feedback Equalizer (DFE), distinguishing it from the DS110DF410 variant. Each channel locks autonomously across 8.5–11.3 Gbps and associated subrates using a 25-MHz reference clock for VCO coarse calibration.

It uses SMBus (I²C) or external EEPROM for configuration, supports input signal detection and CDR lock status indication via dedicated LVCMOS pins, and integrates on-chip eye monitor (EOM) and PRBS generator for system bring-up. The device targets lossy FR-4 backplanes and passive copper interconnects where deterministic jitter cleanup and amplitude restoration are required prior to optical modulation or ASIC interface.

Key Specifications

Pinout & Package

DS110RT410SQ/NOPB is housed in a thermally enhanced 48-pin WQFN package (7 mm × 7 mm, 0.5-mm pitch) with exposed thermal pad (DAP) requiring connection to PCB ground plane via ≥4 vias for optimal thermal performance and signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS110DF410, DS110RT410SQ/NOPB trades DFE capability for lower power and simpler configuration, while versus DS100RT410 it adds multi-rate agility and broader protocol support - making it the balanced choice for mixed-standard, thermally constrained systems.

Availability

DS110RT410SQ/NOPB is available at Aetrix Electronics and suitable for high-speed serial interconnects requiring stable component supply in optical transceiver modules, enterprise switch fabric backplanes, and InfiniBand compute interconnects.

Supply support for DS110RT410SQ/NOPB 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

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and high-speed interface solutions for industrial, communications, and data center applications.

The DS110RT410SQ/NOPB belongs to TI's DS1xxDF/RT410 retimer product line, engineered specifically for signal integrity restoration in 10G-class serial links - balancing low latency, low power, and multi-protocol adaptability for optical and backplane systems.

FAQ

What data rates does the DS110RT410SQ/NOPB support?

The DS110RT410SQ/NOPB supports per-channel data rates from 8.5 Gbps to 11.3 Gbps, including subrates achieved by dividing the base rate by 2, 4, or 8. This enables interoperability with 10GbE (10.3125 Gbps), Fibre Channel (8.5 Gbps), and InfiniBand (10.3125 Gbps), all within a single device. The DS110RT410SQ/NOPB does not support rates outside this range, such as 12.5 Gbps (covered by DS125RT410).

Does the DS110RT410SQ/NOPB include a Decision Feedback Equalizer (DFE)?

No, the DS110RT410SQ/NOPB implements CTLE, CDR, and De-Emphasis only - it omits the 5-tap DFE found in the DS110DF410 variant. This architectural difference reduces power consumption to 180 mW/channel and simplifies adaptation logic, making DS110RT410SQ/NOPB ideal for jitter-dominated channels where linear equalization suffices. DFE is required only for severe post-cursor ISI, which DS110RT410SQ/NOPB does not address.

How is the DS110RT410SQ/NOPB configured during system startup?

The DS110RT410SQ/NOPB supports two configuration modes: SMBus slave mode (EN_SMB = high) for register writes from a host processor, or SMBus master mode (EN_SMB floating) to auto-load settings from an external EEPROM. In master mode, asserting READ_EN initiates EEPROM read; ALL_DONE goes low upon completion. Configuration includes rate selection, VOD, de-emphasis, and CTLE settings - all applied per channel independently. The DS110RT410SQ/NOPB does not require external programming hardware.

What is the role of the 25-MHz reference clock on the DS110RT410SQ/NOPB?

The 25-MHz reference clock (REFCLK_IN) is used solely for VCO coarse calibration during power-up, CDR reset, or loss-of-lock recovery - it accelerates lock acquisition but is not part of the PLL feedback path. The DS110RT410SQ/NOPB uses this clock to measure and select optimal VCO tuning settings, achieving 2-ms lock time in fixed-rate mode. REFCLK_OUT provides a buffered copy for synchronizing multiple DS110RT410SQ/NOPB devices on the same board.

Can the DS110RT410SQ/NOPB operate in industrial temperature ranges?

Yes, the DS110RT410SQ/NOPB is specified for operation from –40°C to +85°C ambient temperature, meeting industrial-grade requirements. Its thermal design - including WQFN-48 package with exposed DAP connected to ground via ≥4 vias - ensures junction temperature remains within safe limits under full 4-channel operation at 180 mW/channel. Thermal resistance is characterized at R_θJA = 26.1°C/W, validated across the full temperature range.